{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-21585", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "state": "PUBLISHED", "assignerShortName": "juniper", "dateReserved": "2023-12-27T19:38:25.702Z", "datePublished": "2024-01-12T00:50:59.105Z", "dateUpdated": "2024-11-14T14:40:50.210Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "platforms": ["MX Series", "PTX Series", "ACX Series", "EX Series", "QFX Series"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "20.4R3-S9", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "21.2R3-S7", "status": "affected", "version": "21.2", "versionType": "semver"}, {"lessThan": "21.3R3-S5", "status": "affected", "version": "21.3", "versionType": "semver"}, {"lessThan": "21.4R3-S5", "status": "affected", "version": "21.4", "versionType": "semver"}, {"lessThan": "22.1R3-S4", "status": "affected", "version": "22.1", "versionType": "semver"}, {"lessThan": "22.2R3-S3", "status": "affected", "version": "22.2", "versionType": "semver"}, {"lessThan": "22.3R3-S1", "status": "affected", "version": "22.3", "versionType": "semver"}, {"lessThan": "22.4R2-S2, 22.4R3", "status": "affected", "version": "22.4", "versionType": "semver"}, {"lessThan": "23.2R1-S1, 23.2R2", "status": "affected", "version": "23.2", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "platforms": ["PTX Series", "ACX Series", "QFX Series"], "product": "Junos OS Evolved", "vendor": "Juniper Networks", "versions": [{"lessThan": "21.3R3-S5-EVO", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "21.4R3-S5-EVO", "status": "affected", "version": "21.4", "versionType": "semver"}, {"lessThan": "22.1R3-S4-EVO", "status": "affected", "version": "22.1", "versionType": "semver"}, {"lessThan": "22.2R3-S3-EVO", "status": "affected", "version": "22.2", "versionType": "semver"}, {"lessThan": "22.3R3-S1-EVO", "status": "affected", "version": "22.3", "versionType": "semver"}, {"lessThan": "22.4R2-S2-EVO, 22.4R3-EVO", "status": "affected", "version": "22.4", "versionType": "semver"}, {"lessThan": "23.2R1-S1-EVO, 23.2R2-EVO", "status": "affected", "version": "23.2", "versionType": "semver"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Non-stop routing (NSR) is enabled using the following configuration:<br><br><tt>&nbsp; [edit chassis redundancy]<br>&nbsp; graceful-switchover;<br>&nbsp; <br>&nbsp; [edit routing-options]<br>&nbsp; nonstop-routing;</tt><br>"}], "value": "Non-stop routing (NSR) is enabled using the following configuration:\n\n\u00a0 [edit chassis redundancy]\n\u00a0 graceful-switchover;\n\u00a0 \n\u00a0 [edit routing-options]\n\u00a0 nonstop-routing;\n"}], "datePublic": "2024-01-10T17:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "\n\n<p>An Improper Handling of Exceptional Conditions vulnerability in BGP session processing of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker, using specific timing outside the attacker's control, to flap BGP sessions and cause the routing protocol daemon (rpd) process to crash and restart, leading to a Denial of Service (DoS) condition. Continued BGP session flapping will create a sustained Denial of Service (DoS) condition.</p><p>This issue only affects routers configured with non-stop routing (NSR) enabled. Graceful Restart (GR) helper mode, enabled by default, is also required for this issue to be exploitable.<br></p>Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.<br><p>When the BGP session flaps on the NSR-enabled router, the device enters GR-helper/LLGR-helper mode due to the peer having negotiated GR/LLGR-restarter capability and the backup BGP requests for replication of the GR/LLGR-helper session, master BGP schedules, and initiates replication of GR/LLGR stale routes to the backup BGP. In this state, if the BGP session with the BGP peer comes up again, unsolicited replication is initiated for the peer without cleaning up the ongoing GR/LLGR-helper mode replication. This parallel two instances of replication for the same peer leads to the assert if the BGP session flaps again.</p><p>This issue affects:</p><p>Juniper Networks Junos OS</p><p></p><ul><li>All versions earlier than 20.4R3-S9;</li><li>21.2 versions earlier than 21.2R3-S7;</li><li>21.3 versions earlier than 21.3R3-S5;</li><li>21.4 versions earlier than 21.4R3-S5;</li><li>22.1 versions earlier than 22.1R3-S4;</li><li>22.2 versions earlier than 22.2R3-S3;</li><li>22.3 versions earlier than 22.3R3-S1;</li><li>22.4 versions earlier than 22.4R2-S2, 22.4R3;</li><li>23.2 versions earlier than 23.2R1-S1, 23.2R2.</li></ul><p></p><p>Juniper Networks Junos OS Evolved</p><p></p><ul><li>All versions earlier than 21.3R3-S5-EVO;</li><li>21.4 versions earlier than 21.4R3-S5-EVO;</li><li>22.1 versions earlier than 22.1R3-S4-EVO;</li><li>22.2 versions earlier than 22.2R3-S3-EVO;</li><li>22.3 versions earlier than 22.3R3-S1-EVO;</li><li>22.4 versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;</li><li>23.2 versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.</li></ul><p></p>\n\n"}], "value": "\nAn Improper Handling of Exceptional Conditions vulnerability in BGP session processing of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker, using specific timing outside the attacker's control, to flap BGP sessions and cause the routing protocol daemon (rpd) process to crash and restart, leading to a Denial of Service (DoS) condition. Continued BGP session flapping will create a sustained Denial of Service (DoS) condition.\n\nThis issue only affects routers configured with non-stop routing (NSR) enabled. Graceful Restart (GR) helper mode, enabled by default, is also required for this issue to be exploitable.\n\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nWhen the BGP session flaps on the NSR-enabled router, the device enters GR-helper/LLGR-helper mode due to the peer having negotiated GR/LLGR-restarter capability and the backup BGP requests for replication of the GR/LLGR-helper session, master BGP schedules, and initiates replication of GR/LLGR stale routes to the backup BGP. In this state, if the BGP session with the BGP peer comes up again, unsolicited replication is initiated for the peer without cleaning up the ongoing GR/LLGR-helper mode replication. This parallel two instances of replication for the same peer leads to the assert if the BGP session flaps again.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n * All versions earlier than 20.4R3-S9;\n * 21.2 versions earlier than 21.2R3-S7;\n * 21.3 versions earlier than 21.3R3-S5;\n * 21.4 versions earlier than 21.4R3-S5;\n * 22.1 versions earlier than 22.1R3-S4;\n * 22.2 versions earlier than 22.2R3-S3;\n * 22.3 versions earlier than 22.3R3-S1;\n * 22.4 versions earlier than 22.4R2-S2, 22.4R3;\n * 23.2 versions earlier than 23.2R1-S1, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n * All versions earlier than 21.3R3-S5-EVO;\n * 21.4 versions earlier than 21.4R3-S5-EVO;\n * 22.1 versions earlier than 22.1R3-S4-EVO;\n * 22.2 versions earlier than 22.2R3-S3-EVO;\n * 22.3 versions earlier than 22.3R3-S1-EVO;\n * 22.4 versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n * 23.2 versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n"}], "exploits": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Juniper SIRT is not aware of any malicious exploitation of this vulnerability.</p>"}], "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\n\n"}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-755", "description": "CWE-755 Improper Handling of Exceptional Conditions", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"description": "Denial of Service (DoS)", "lang": "en"}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2024-01-30T23:32:17.643Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://supportportal.juniper.net/JSA75723"}, {"tags": ["technical-description"], "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"}, {"tags": ["product"], "url": "https://supportportal.juniper.net/s/article/MX-GR-and-LLGR-capability-and-compatibility-changes-after-15-1-release"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The following software releases have been updated to resolve this specific issue: </p><p>Junos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.1R2, 23.2R1-S1, 23.2R2, 23.3R1, and all subsequent releases.</p><p>Junos OS Evolved: 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R2-S2-EVO, 22.4R3-EVO, 23.1R2-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.</p>"}], "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.1R2, 23.2R1-S1, 23.2R2, 23.3R1, and all subsequent releases.\n\nJunos OS Evolved: 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R2-S2-EVO, 22.4R3-EVO, 23.1R2-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.\n\n"}], "source": {"advisory": "JSA75723", "defect": ["1742287"], "discovery": "USER"}, "timeline": [{"lang": "en", "time": "2024-01-10T17:00:00.000Z", "value": "Initial Publication"}, {"lang": "en", "time": "2024-01-16T17:00:00.000Z", "value": "Clarified that SRX Series, which does not support NSR, is not vulnerable"}, {"lang": "en", "time": "2024-01-30T17:00:00.000Z", "value": "Updated required config and workaround to be more precise"}], "title": "Junos OS and Junos OS Evolved: BGP session flaps on NSR-enabled devices can cause rpd crash", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Graceful Restart (GR) helper mode and Long-Lived Graceful Restart (LLGR) helper mode can be disabled to prevent this issue.<br><br><tt>&nbsp; [edit protocols bgp graceful-restart]<br>&nbsp; disable;<br><br>&nbsp; [edit protocols bgp graceful-restart long-lived receiver]<br>&nbsp; disable;</tt>"}], "value": "Graceful Restart (GR) helper mode and Long-Lived Graceful Restart (LLGR) helper mode can be disabled to prevent this issue.\n\n\u00a0 [edit protocols bgp graceful-restart]\n\u00a0 disable;\n\n\u00a0 [edit protocols bgp graceful-restart long-lived receiver]\n\u00a0 disable;"}], "x_generator": {"engine": "Vulnogram 0.1.0-av217"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-01T22:27:34.817Z"}, "title": "CVE Program Container", "references": [{"tags": ["vendor-advisory", "x_transferred"], "url": "https://supportportal.juniper.net/JSA75723"}, {"tags": ["technical-description", "x_transferred"], "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"}, {"tags": ["product", "x_transferred"], "url": "https://supportportal.juniper.net/s/article/MX-GR-and-LLGR-capability-and-compatibility-changes-after-15-1-release"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-11-14T14:40:34.207129Z", "id": "CVE-2024-21585", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-14T14:40:50.210Z"}}]}}

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{"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-14T14:40:42.616Z"}}], "cna": {"title": "Junos OS and Junos OS Evolved: BGP session flaps on NSR-enabled devices can cause rpd crash", "source": {"defect": ["1742287"], "advisory": "JSA75723", "discovery": "USER"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Juniper Networks", "product": "Junos OS", "versions": [{"status": "affected", "version": "0", "lessThan": "20.4R3-S9", "versionType": "semver"}, {"status": "affected", "version": "21.2", "lessThan": "21.2R3-S7", "versionType": "semver"}, {"status": "affected", "version": "21.3", "lessThan": "21.3R3-S5", "versionType": "semver"}, {"status": "affected", "version": "21.4", "lessThan": "21.4R3-S5", "versionType": "semver"}, {"status": "affected", "version": "22.1", "lessThan": "22.1R3-S4", "versionType": "semver"}, {"status": "affected", "version": "22.2", "lessThan": "22.2R3-S3", "versionType": "semver"}, {"status": "affected", "version": "22.3", "lessThan": "22.3R3-S1", "versionType": "semver"}, {"status": "affected", "version": "22.4", "lessThan": "22.4R2-S2, 22.4R3", "versionType": "semver"}, {"status": "affected", "version": "23.2", "lessThan": "23.2R1-S1, 23.2R2", "versionType": "semver"}], "platforms": ["MX Series", "PTX Series", "ACX Series", "EX Series", "QFX Series"], "defaultStatus": "unaffected"}, {"vendor": "Juniper Networks", "product": "Junos OS Evolved", "versions": [{"status": "affected", "version": "0", "lessThan": "21.3R3-S5-EVO", "versionType": "semver"}, {"status": "affected", "version": "21.4", "lessThan": "21.4R3-S5-EVO", "versionType": "semver"}, {"status": "affected", "version": "22.1", "lessThan": "22.1R3-S4-EVO", "versionType": "semver"}, {"status": "affected", "version": "22.2", "lessThan": "22.2R3-S3-EVO", "versionType": "semver"}, {"status": "affected", "version": "22.3", "lessThan": "22.3R3-S1-EVO", "versionType": "semver"}, {"status": "affected", "version": "22.4", "lessThan": "22.4R2-S2-EVO, 22.4R3-EVO", "versionType": "semver"}, {"status": "affected", "version": "23.2", "lessThan": "23.2R1-S1-EVO, 23.2R2-EVO", "versionType": "semver"}], "platforms": ["PTX Series", "ACX Series", "QFX Series"], "defaultStatus": "unaffected"}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\n\n", "supportingMedia": [{"type": "text/html", "value": "<p>Juniper SIRT is not aware of any malicious exploitation of this vulnerability.</p>", "base64": false}]}], "timeline": [{"lang": "en", "time": "2024-01-10T17:00:00.000Z", "value": "Initial Publication"}, {"lang": "en", "time": "2024-01-16T17:00:00.000Z", "value": "Clarified that SRX Series, which does not support NSR, is not vulnerable"}, {"lang": "en", "time": "2024-01-30T17:00:00.000Z", "value": "Updated required config and workaround to be more precise"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.1R2, 23.2R1-S1, 23.2R2, 23.3R1, and all subsequent releases.\n\nJunos OS Evolved: 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R2-S2-EVO, 22.4R3-EVO, 23.1R2-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.\n\n", "supportingMedia": [{"type": "text/html", "value": "<p>The following software releases have been updated to resolve this specific issue: </p><p>Junos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.1R2, 23.2R1-S1, 23.2R2, 23.3R1, and all subsequent releases.</p><p>Junos OS Evolved: 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R2-S2-EVO, 22.4R3-EVO, 23.1R2-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.</p>", "base64": false}]}], "datePublic": "2024-01-10T17:00:00.000Z", "references": [{"url": "https://supportportal.juniper.net/JSA75723", "tags": ["vendor-advisory"]}, {"url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L", "tags": ["technical-description"]}, {"url": "https://supportportal.juniper.net/s/article/MX-GR-and-LLGR-capability-and-compatibility-changes-after-15-1-release", "tags": ["product"]}], "workarounds": [{"lang": "en", "value": "Graceful Restart (GR) helper mode and Long-Lived Graceful Restart (LLGR) helper mode can be disabled to prevent this issue.\n\n\u00a0 [edit protocols bgp graceful-restart]\n\u00a0 disable;\n\n\u00a0 [edit protocols bgp graceful-restart long-lived receiver]\n\u00a0 disable;", "supportingMedia": [{"type": "text/html", "value": "Graceful Restart (GR) helper mode and Long-Lived Graceful Restart (LLGR) helper mode can be disabled to prevent this issue.<br><br><tt>&nbsp; [edit protocols bgp graceful-restart]<br>&nbsp; disable;<br><br>&nbsp; [edit protocols bgp graceful-restart long-lived receiver]<br>&nbsp; disable;</tt>", "base64": false}]}], "x_generator": {"engine": "Vulnogram 0.1.0-av217"}, "descriptions": [{"lang": "en", "value": "\nAn Improper Handling of Exceptional Conditions vulnerability in BGP session processing of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker, using specific timing outside the attacker's control, to flap BGP sessions and cause the routing protocol daemon (rpd) process to crash and restart, leading to a Denial of Service (DoS) condition. Continued BGP session flapping will create a sustained Denial of Service (DoS) condition.\n\nThis issue only affects routers configured with non-stop routing (NSR) enabled. Graceful Restart (GR) helper mode, enabled by default, is also required for this issue to be exploitable.\n\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nWhen the BGP session flaps on the NSR-enabled router, the device enters GR-helper/LLGR-helper mode due to the peer having negotiated GR/LLGR-restarter capability and the backup BGP requests for replication of the GR/LLGR-helper session, master BGP schedules, and initiates replication of GR/LLGR stale routes to the backup BGP. In this state, if the BGP session with the BGP peer comes up again, unsolicited replication is initiated for the peer without cleaning up the ongoing GR/LLGR-helper mode replication. This parallel two instances of replication for the same peer leads to the assert if the BGP session flaps again.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n * All versions earlier than 20.4R3-S9;\n * 21.2 versions earlier than 21.2R3-S7;\n * 21.3 versions earlier than 21.3R3-S5;\n * 21.4 versions earlier than 21.4R3-S5;\n * 22.1 versions earlier than 22.1R3-S4;\n * 22.2 versions earlier than 22.2R3-S3;\n * 22.3 versions earlier than 22.3R3-S1;\n * 22.4 versions earlier than 22.4R2-S2, 22.4R3;\n * 23.2 versions earlier than 23.2R1-S1, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n * All versions earlier than 21.3R3-S5-EVO;\n * 21.4 versions earlier than 21.4R3-S5-EVO;\n * 22.1 versions earlier than 22.1R3-S4-EVO;\n * 22.2 versions earlier than 22.2R3-S3-EVO;\n * 22.3 versions earlier than 22.3R3-S1-EVO;\n * 22.4 versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n * 23.2 versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n", "supportingMedia": [{"type": "text/html", "value": "\n\n<p>An Improper Handling of Exceptional Conditions vulnerability in BGP session processing of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker, using specific timing outside the attacker's control, to flap BGP sessions and cause the routing protocol daemon (rpd) process to crash and restart, leading to a Denial of Service (DoS) condition. Continued BGP session flapping will create a sustained Denial of Service (DoS) condition.</p><p>This issue only affects routers configured with non-stop routing (NSR) enabled. Graceful Restart (GR) helper mode, enabled by default, is also required for this issue to be exploitable.<br></p>Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.<br><p>When the BGP session flaps on the NSR-enabled router, the device enters GR-helper/LLGR-helper mode due to the peer having negotiated GR/LLGR-restarter capability and the backup BGP requests for replication of the GR/LLGR-helper session, master BGP schedules, and initiates replication of GR/LLGR stale routes to the backup BGP. In this state, if the BGP session with the BGP peer comes up again, unsolicited replication is initiated for the peer without cleaning up the ongoing GR/LLGR-helper mode replication. This parallel two instances of replication for the same peer leads to the assert if the BGP session flaps again.</p><p>This issue affects:</p><p>Juniper Networks Junos OS</p><p></p><ul><li>All versions earlier than 20.4R3-S9;</li><li>21.2 versions earlier than 21.2R3-S7;</li><li>21.3 versions earlier than 21.3R3-S5;</li><li>21.4 versions earlier than 21.4R3-S5;</li><li>22.1 versions earlier than 22.1R3-S4;</li><li>22.2 versions earlier than 22.2R3-S3;</li><li>22.3 versions earlier than 22.3R3-S1;</li><li>22.4 versions earlier than 22.4R2-S2, 22.4R3;</li><li>23.2 versions earlier than 23.2R1-S1, 23.2R2.</li></ul><p></p><p>Juniper Networks Junos OS Evolved</p><p></p><ul><li>All versions earlier than 21.3R3-S5-EVO;</li><li>21.4 versions earlier than 21.4R3-S5-EVO;</li><li>22.1 versions earlier than 22.1R3-S4-EVO;</li><li>22.2 versions earlier than 22.2R3-S3-EVO;</li><li>22.3 versions earlier than 22.3R3-S1-EVO;</li><li>22.4 versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;</li><li>23.2 versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.</li></ul><p></p>\n\n", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-755", "description": "CWE-755 Improper Handling of Exceptional Conditions"}]}, {"descriptions": [{"lang": "en", "description": "Denial of Service (DoS)"}]}], "configurations": [{"lang": "en", "value": "Non-stop routing (NSR) is enabled using the following configuration:\n\n\u00a0 [edit chassis redundancy]\n\u00a0 graceful-switchover;\n\u00a0 \n\u00a0 [edit routing-options]\n\u00a0 nonstop-routing;\n", "supportingMedia": [{"type": "text/html", "value": "Non-stop routing (NSR) is enabled using the following configuration:<br><br><tt>&nbsp; [edit chassis redundancy]<br>&nbsp; graceful-switchover;<br>&nbsp; <br>&nbsp; [edit routing-options]<br>&nbsp; nonstop-routing;</tt><br>", "base64": false}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2024-01-30T23:32:17.643Z"}}}, "cveMetadata": {"cveId": "CVE-2024-21585", "state": "PUBLISHED", "dateUpdated": "2024-11-14T14:40:50.210Z", "dateReserved": "2023-12-27T19:38:25.702Z", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "datePublished": "2024-01-12T00:50:59.105Z", "assignerShortName": "juniper"}, "dataVersion": "5.1"}

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Continued BGP session flapping will create a sustained Denial of Service (DoS) condition.\n\nThis issue only affects routers configured with non-stop routing (NSR) enabled. Graceful Restart (GR) helper mode, enabled by default, is also required for this issue to be exploitable.\n\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nWhen the BGP session flaps on the NSR-enabled router, the device enters GR-helper/LLGR-helper mode due to the peer having negotiated GR/LLGR-restarter capability and the backup BGP requests for replication of the GR/LLGR-helper session, master BGP schedules, and initiates replication of GR/LLGR stale routes to the backup BGP. In this state, if the BGP session with the BGP peer comes up again, unsolicited replication is initiated for the peer without cleaning up the ongoing GR/LLGR-helper mode replication. This parallel two instances of replication for the same peer leads to the assert if the BGP session flaps again.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n * All versions earlier than 20.4R3-S9;\n * 21.2 versions earlier than 21.2R3-S7;\n * 21.3 versions earlier than 21.3R3-S5;\n * 21.4 versions earlier than 21.4R3-S5;\n * 22.1 versions earlier than 22.1R3-S4;\n * 22.2 versions earlier than 22.2R3-S3;\n * 22.3 versions earlier than 22.3R3-S1;\n * 22.4 versions earlier than 22.4R2-S2, 22.4R3;\n * 23.2 versions earlier than 23.2R1-S1, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n * All versions earlier than 21.3R3-S5-EVO;\n * 21.4 versions earlier than 21.4R3-S5-EVO;\n * 22.1 versions earlier than 22.1R3-S4-EVO;\n * 22.2 versions earlier than 22.2R3-S3-EVO;\n * 22.3 versions earlier than 22.3R3-S1-EVO;\n * 22.4 versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n * 23.2 versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n"}, {"lang": "es", "value": "Una vulnerabilidad de manejo inadecuado de condiciones excepcionales en el procesamiento de sesiones BGP de Juniper Networks Junos OS y Junos OS Evolved permite que un atacante basado en red no autenticado, utilizando tiempos espec\u00edficos fuera del control del atacante, altere sesiones BGP y provoque el proceso routing protocol daemon (rpd) fallar y reiniciarse, lo que lleva a una condici\u00f3n de denegaci\u00f3n de servicio (DoS). La fluctuaci\u00f3n continua de la sesi\u00f3n BGP crear\u00e1 una condici\u00f3n sostenida de denegaci\u00f3n de servicio (DoS). Este problema solo afecta a los enrutadores configurados con el enrutamiento continuo (NSR) habilitado. Tambi\u00e9n se requiere el modo Graceful Restart (GR), habilitado de forma predeterminada, para que este problema sea explotable. Cuando la sesi\u00f3n BGP falla en el enrutador habilitado para NSR, el dispositivo ingresa al modo GR-helper/LLGR-helper debido a que el par ha negociado la capacidad de reinicio GR/LLGR y el BGP de respaldo solicita la replicaci\u00f3n de la sesi\u00f3n GR/LLGR-helper. , domina las programaciones de BGP e inicia la replicaci\u00f3n de rutas obsoletas de GR/LLGR al BGP de respaldo. En este estado, si la sesi\u00f3n BGP con el par BGP vuelve a iniciarse, se inicia la replicaci\u00f3n no solicitada para el par sin limpiar la replicaci\u00f3n en curso en modo auxiliar GR/LLGR. Estas dos instancias paralelas de replicaci\u00f3n para el mismo par conducen a la afirmaci\u00f3n si la sesi\u00f3n BGP vuelve a fallar. Este problema afecta a: Juniper Networks Junos OS * Todas las versiones anteriores a 20.4R3-S9; * Versiones 21.2 anteriores a 21.2R3-S7; * Versiones 21.3 anteriores a 21.3R3-S5; * Versiones 21.4 anteriores a 21.4R3-S5; * Versiones 22.1 anteriores a 22.1R3-S4; * Versiones 22.2 anteriores a 22.2R3-S3; * Versiones 22.3 anteriores a 22.3R3-S1; * Versiones 22.4 anteriores a 22.4R2-S2, 22.4R3; * Versiones 23.2 anteriores a 23.2R1-S1, 23.2R2. Juniper Networks Junos OS Evolved * Todas las versiones anteriores a 21.3R3-S5-EVO; * Versiones 21.4 anteriores a 21.4R3-S5-EVO; * Versiones 22.1 anteriores a 22.1R3-S4-EVO; * Versiones 22.2 anteriores a 22.2R3-S3-EVO; * Versiones 22.3 anteriores a 22.3R3-S1-EVO; * Versiones 22.4 anteriores a 22.4R2-S2-EVO, 22.4R3-EVO; * Versiones 23.2 anteriores a 23.2R1-S1-EVO, 23.2R2-EVO."}], "id": "CVE-2024-21585", "lastModified": "2024-01-31T00:15:45.920", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2024-01-12T01:15:46.053", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA75723"}, {"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/s/article/MX-GR-and-LLGR-capability-and-compatibility-changes-after-15-1-release"}, {"source": "sirt@juniper.net", "tags": ["Third Party Advisory"], "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-755"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-755"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}