{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2022-2928", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "assignerShortName": "isc", "dateUpdated": "2024-09-17T00:21:40.167Z", "dateReserved": "2022-08-22T00:00:00", "datePublished": "2022-10-07T04:45:11.751554Z"}, "containers": {"cna": {"title": "An option refcount overflow exists in dhcpd", "datePublic": "2022-10-05T00:00:00", "providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2023-05-03T00:00:00"}, "descriptions": [{"lang": "en", "value": "In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort."}], "affected": [{"vendor": "ISC", "product": "ISC DHCP", "versions": [{"version": "4.4.0 through versions before 4.4.3-P1", "status": "affected"}, {"version": "4.1 ESV 4.1-ESV-R1 through versions before 4.1-ESV-R16-P1", "status": "affected"}]}], "references": [{"url": "https://kb.isc.org/docs/cve-2022-2928"}, {"name": "[debian-lts-announce] 20221010 [SECURITY] [DLA 3146-1] isc-dhcp security update", "tags": ["mailing-list"], "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html"}, {"name": "FEDORA-2022-f5a45757df", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K/"}, {"name": "FEDORA-2022-9ca9a94e28", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX/"}, {"name": "FEDORA-2022-c4f274a54f", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU/"}, {"name": "GLSA-202305-22", "tags": ["vendor-advisory"], "url": "https://security.gentoo.org/glsa/202305-22"}], "credits": [{"lang": "en", "value": "ISC would like to thank VictorV of Cyber Kunlun Lab for discovering and reporting this issue."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "A DHCP server configured with allow leasequery;, a remote machine with access to the server can send lease queries for the same lease multiple times, leading to the add_option() function being repeatedly called. This could cause an option's refcount field to overflow and the server to abort. Internally, reference counters are integers and thus overflow at 2^31 references, so even at 1000 lease query responses per second, it would take more than three weeks to crash the server. Affects In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1"}]}], "source": {"discovery": "EXTERNAL"}, "workarounds": [{"lang": "en", "value": "Disable lease query on the server for DHCPv4 or restart the server periodically."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of ISC DHCP. These can all be downloaded from https://www.isc.org/downloads. 4.4.3-P1 4.1-ESV-R16-P2"}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T00:53:00.326Z"}, "title": "CVE Program Container", "references": [{"url": "https://kb.isc.org/docs/cve-2022-2928", "tags": ["x_transferred"]}, {"name": "[debian-lts-announce] 20221010 [SECURITY] [DLA 3146-1] isc-dhcp security update", "tags": ["mailing-list", "x_transferred"], "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html"}, {"name": "FEDORA-2022-f5a45757df", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K/"}, {"name": "FEDORA-2022-9ca9a94e28", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX/"}, {"name": "FEDORA-2022-c4f274a54f", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU/"}, {"name": "GLSA-202305-22", "tags": ["vendor-advisory", "x_transferred"], "url": "https://security.gentoo.org/glsa/202305-22"}]}]}}

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However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort."}, {"lang": "es", "value": "En ISC DHCP versiones 4.4.0 anteriores a 4.4.3, ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16-P1, cuando la funci\u00f3n option_code_hash_lookup() es llamada desde add_option(), incrementa el campo refcount de la opci\u00f3n. Sin embargo, no se presenta una llamada correspondiente a option_dereference() para disminuir el campo refcount. La funci\u00f3n add_option() s\u00f3lo es usada en las respuestas del servidor a paquetes de consulta de arrendamiento. Cada respuesta de consulta de arrendamiento llama a esta funci\u00f3n para varias opciones, por lo que eventualmente, los contadores de referencia podr\u00edan desbordarse y causar a el servidor abortar"}], "id": "CVE-2022-2928", "lastModified": "2023-11-07T03:47:05.293", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-officer@isc.org", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Secondary"}]}, "published": "2022-10-07T05:15:08.677", "references": [{"source": "security-officer@isc.org", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2022-2928"}, {"source": "security-officer@isc.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX/"}, {"source": "security-officer@isc.org", "url": "https://security.gentoo.org/glsa/202305-22"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Upstream acknowledges VictorV (Cyber Kunlun Lab) as the original reporter.", "affected_release": [{"advisory": "RHSA-2023:3000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "dhcp-12:4.3.6-49.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2023-05-16T00:00:00Z"}, {"advisory": "RHSA-2023:2502", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "dhcp-12:4.4.2-18.b1.el9", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}], "bugzilla": {"description": "dhcp: option refcount overflow when leasequery is enabled leading to dhcpd abort", "id": "2132002", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2132002"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-190", "details": ["In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.", "An integer overflow vulnerability was found in the DHCP server. When the \"option_code_hash_lookup()\" function is called from \"add_option()\", it increases the option's \"refcount\" field. However, there is not a corresponding call to \"option_dereference()\" to decrement the \"refcount\" field. The \"add_option()\" function is only used in server responses to lease query packets. Each lease query response calls this function for several options. Hence, a DHCP server configured with \"allow lease query,\" a remote machine with access to the server, can send lease queries for the same lease multiple times, leading to the \"add_option()\" function being called repeatedly. This issue could cause the reference counters to overflow and the server to abort or crash."], "mitigation": {"lang": "en:us", "value": "Possible workaround - Disable lease query on the server for DHCPv4 or restart the server periodically."}, "name": "CVE-2022-2928", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2022-10-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-2928\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-2928\nhttps://kb.isc.org/docs/cve-2022-2928"], "statement": "Vulnerable servers are network accessible to an attacker and configured to allow and process lease queries.\nInternally, reference counters are integers and thus overflow at 2^31 references, so even at 1000 lease query responses per second, it would take more than three weeks to crash the server.", "threat_severity": "Moderate", "upstream_fix": "dhcp 4.4.3-P1, dhcp 4.1-ESV-R16-P2"}