{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-2512", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "state": "PUBLISHED", "assignerShortName": "cloudflare", "dateReserved": "2023-05-04T08:31:01.013Z", "datePublished": "2023-05-12T10:09:06.905Z", "dateUpdated": "2024-08-02T06:26:09.518Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "workerd", "vendor": "Cloudflare", "versions": [{"changes": [{"at": "v1.20230419.0", "status": "unaffected"}], "lessThanOrEqual": "v1.20230404.0", "status": "affected", "version": "v1.20221108.0", "versionType": "patch"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "In order for the bug to be exploitable, the process would need to be able to allocate 160GB of RAM.<br>"}], "value": "In order for the bug to be exploitable, the process would need to be able to allocate 160GB of RAM.\n"}, {"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "An attacker would have to upload a single form-encoded HTTP request of at least tens of gigabytes in size. "}], "value": "An attacker would have to upload a single form-encoded HTTP request of at least tens of gigabytes in size. "}], "credits": [{"lang": "en", "type": "reporter", "user": "00000000-0000-4000-9000-000000000000", "value": "ubercomp"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p><span style=\"background-color: var(--wht);\">Prior to version v1.20230419.0, the FormData API implementation was subject to an integer overflow. If a FormData instance contained more than 2^31 elements, the </span><code>forEach()</code><span style=\"background-color: var(--wht);\">&nbsp;method could end up reading from the wrong location in memory while iterating over elements. This would most likely lead to a segmentation fault, but could theoretically allow arbitrary undefined behavior.</span><br></p><p>In order for the bug to be exploitable, the process would need to be able to allocate 160GB of RAM. Due to this, the bug was never exploitable on the Cloudflare Workers platform, but could theoretically be exploitable on deployments of workerd running on machines with a huge amount of memory. Moreover, in order to be remotely exploited, an attacker would have to upload a single form-encoded HTTP request of at least tens of gigabytes in size. The application code would then have to use <code>request.formData()</code>&nbsp;to parse the request and <code>formData.forEach()</code>&nbsp;to iterate over this data. Due to these limitations, the exploitation likelihood was considered Low.</p><p><span style=\"background-color: var(--wht);\">A fix that addresses this vulnerability has been released in version v1.20230419.0 and users are encouraged to update to the latest version available.</span><br></p>"}], "value": "Prior to version v1.20230419.0, the FormData API implementation was subject to an integer overflow. If a FormData instance contained more than 2^31 elements, the forEach()\u00a0method could end up reading from the wrong location in memory while iterating over elements. This would most likely lead to a segmentation fault, but could theoretically allow arbitrary undefined behavior.\n\n\nIn order for the bug to be exploitable, the process would need to be able to allocate 160GB of RAM. Due to this, the bug was never exploitable on the Cloudflare Workers platform, but could theoretically be exploitable on deployments of workerd running on machines with a huge amount of memory. Moreover, in order to be remotely exploited, an attacker would have to upload a single form-encoded HTTP request of at least tens of gigabytes in size. The application code would then have to use request.formData()\u00a0to parse the request and formData.forEach()\u00a0to iterate over this data. Due to these limitations, the exploitation likelihood was considered Low.\n\nA fix that addresses this vulnerability has been released in version v1.20230419.0 and users are encouraged to update to the latest version available.\n\n\n"}], "impacts": [{"capecId": "CAPEC-123", "descriptions": [{"lang": "en", "value": "CAPEC-123 Buffer Manipulation"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2023-05-12T10:10:21.870Z"}, "references": [{"url": "https://github.com/cloudflare/workerd/releases/tag/v1.20230419.0"}, {"url": "https://github.com/cloudflare/workerd/security/advisories/GHSA-8vx6-69vg-c46f"}], "source": {"discovery": "EXTERNAL"}, "title": "Buffer under-read in workerd", "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T06:26:09.518Z"}, "title": "CVE Program Container", "references": [{"url": "https://github.com/cloudflare/workerd/releases/tag/v1.20230419.0", "tags": ["x_transferred"]}, {"url": "https://github.com/cloudflare/workerd/security/advisories/GHSA-8vx6-69vg-c46f", "tags": ["x_transferred"]}]}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:cloudflare:workerd:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "1AF26A53-BECD-490F-AE46-A498A22C0077", "versionEndExcluding": "1.20230419.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Prior to version v1.20230419.0, the FormData API implementation was subject to an integer overflow. If a FormData instance contained more than 2^31 elements, the forEach()\u00a0method could end up reading from the wrong location in memory while iterating over elements. This would most likely lead to a segmentation fault, but could theoretically allow arbitrary undefined behavior.\n\n\nIn order for the bug to be exploitable, the process would need to be able to allocate 160GB of RAM. Due to this, the bug was never exploitable on the Cloudflare Workers platform, but could theoretically be exploitable on deployments of workerd running on machines with a huge amount of memory. Moreover, in order to be remotely exploited, an attacker would have to upload a single form-encoded HTTP request of at least tens of gigabytes in size. The application code would then have to use request.formData()\u00a0to parse the request and formData.forEach()\u00a0to iterate over this data. Due to these limitations, the exploitation likelihood was considered Low.\n\nA fix that addresses this vulnerability has been released in version v1.20230419.0 and users are encouraged to update to the latest version available.\n\n\n"}], "id": "CVE-2023-2512", "lastModified": "2023-05-26T18:52:34.763", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "cna@cloudflare.com", "type": "Secondary"}]}, "published": "2023-05-12T11:15:13.033", "references": [{"source": "cna@cloudflare.com", "tags": ["Release Notes"], "url": "https://github.com/cloudflare/workerd/releases/tag/v1.20230419.0"}, {"source": "cna@cloudflare.com", "tags": ["Vendor Advisory"], "url": "https://github.com/cloudflare/workerd/security/advisories/GHSA-8vx6-69vg-c46f"}], "sourceIdentifier": "cna@cloudflare.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "cna@cloudflare.com", "type": "Secondary"}]}

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