{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2022-2929", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "assignerShortName": "isc", "dateUpdated": "2024-09-16T18:28:37.665Z", "dateReserved": "2022-08-22T00:00:00", "datePublished": "2022-10-07T04:45:12.836741Z"}, "containers": {"cna": {"title": "DHCP memory leak", "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 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory."}], "affected": [{"vendor": "ISC", "product": "ISC DHCP", "versions": [{"version": "1.0 through versions before 4.1-ESV-R16-P2", "status": "affected"}, {"version": "4.2 through versions before 4.4.3.-P1", "status": "affected"}]}], "references": [{"url": "https://kb.isc.org/docs/cve-2022-2929"}, {"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": "The function fqdn_universe_decode() allocates buffer space for the contents of option 81 (fqdn) data received in a DHCP packet. The maximum length of a DNS label is 63 bytes. The function tests the length byte of each label contained in the fqdn; if it finds a label whose length byte value is larger than 63, it returns without dereferencing the buffer space. This will cause a memory leak. Affects In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1"}]}], "source": {"discovery": "EXTERNAL"}, "workarounds": [{"lang": "en", "value": "As exploiting this vulnerability requires an attacker to send packets for an extended period of time, restarting servers periodically could be a viable workaround."}], "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": "2024-08-03T00:52:59.819Z"}, "title": "CVE Program Container", "references": [{"url": "https://kb.isc.org/docs/cve-2022-2929", "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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{"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": "Secondary"}, {"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": 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"sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "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: DHCP memory leak", "id": "2132001", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2132001"}, "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"}, "details": ["In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory.", "A vulnerability was found in the DHCP server where the \"fqdn_universe_decode()\" function allocates buffer space for the contents of option 81 (fqdn) data received in a DHCP packet. The maximum length of a DNS \"label\" is 63 bytes. The function tests the length byte of each label contained in the \"fqdn\"; if it finds a label whose length byte value is larger than 63, it returns without dereferencing the buffer space. This issue causes a memory leak. On a system with access to a DHCP server, an attacker from any adjacent network could send DHCP packets crafted to include \"fqdn\" labels longer than 63 bytes to the DHCP server, eventually causing the server to run out of memory and crash."], "mitigation": {"lang": "en:us", "value": "Possible workaround - As exploiting this vulnerability requires an attacker to send packets for an extended period of time, restarting servers periodically could be a viable workaround."}, "name": "CVE-2022-2929", "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-2022-2929\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-2929\nhttps://kb.isc.org/docs/cve-2022-2929"], "threat_severity": "Moderate"}