248 lines
12 KiB
JSON
248 lines
12 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2021-47244",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-04-10T18:59:19.533Z",
|
|
"datePublished": "2024-05-21T14:19:42.983Z",
|
|
"dateUpdated": "2026-08-05T08:46:55.302Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T08:46:55.302Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: Fix out of bounds when parsing TCP options\n\nThe TCP option parser in mptcp (mptcp_get_options) could read one byte\nout of bounds. When the length is 1, the execution flow gets into the\nloop, reads one byte of the opcode, and if the opcode is neither\nTCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the\nlength of 1.\n\nThis fix is inspired by commit 9609dad263f8 (\"ipv4: tcp_input: fix stack\nout of bounds when parsing TCP options.\")."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
|
|
"baseScore": 8.2,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:N - mptcp_get_options() parses TCP options from received skbs on MPTCP sockets, including unauthenticated SYNs in subflow_check_req(), established-path mptcp_incoming_options(), and peer SYN-ACKs in subflow_finish_connect(), so a remote peer triggers it via crafted TCP packets.\nAC:L - The attacker fully controls the TCP option bytes and can reliably leave a 1-byte remainder (e.g., NOP padding or a 3-byte option in a 4-byte options area) with a non-EOL/non-NOP opcode so the missing length<2 check is hit every time.\nPR:N - The vulnerable parser runs on the pre-accept SYN path and on ordinary MPTCP segment receive with no credential or capability check; any network peer that can send TCP segments to an MPTCP socket can reach it.\nUI:N - Against an MPTCP listener or an existing MPTCP connection, exploitation is by sending packets alone and does not require a separate user to open a file, mount something, or otherwise interact.\nS:U - Impact is confined to the host kernel that parses the packet; this is ordinary in-kernel memory-safety exposure, not a VM/IOMMU/sandbox boundary cross.\nC:L - The bug is a single-byte out-of-bounds read past the doff-bounded options (into payload, skb tailroom, or skb_shared_info); per guidance that is a bounded OOB read, so confidentiality is Low rather than High.\nI:N - There is no out-of-bounds write; when length==1 the wrongly read opsize is only compared and then the function returns, so it cannot be turned into a memory write or control-flow hijack primitive.\nA:H - Reading one byte past the validated TCP header length can touch memory outside skb->len and can oops/fault depending on skb layout (and is a hard failure under KASAN), so availability impact is scored High under the overestimate rule."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"net/mptcp/options.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "cec37a6e41aae7bf3df9a3da783380a4d9325fd8",
|
|
"lessThan": "73eeba71dc9932970befa009e68272a3d5ec4a58",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cec37a6e41aae7bf3df9a3da783380a4d9325fd8",
|
|
"lessThan": "76e02b8905d0691e89e104a882f3bba7dd0f6037",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cec37a6e41aae7bf3df9a3da783380a4d9325fd8",
|
|
"lessThan": "07718be265680dcf496347d475ce1a5442f55ad7",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"net/mptcp/options.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "5.6",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "5.6",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.46",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.12.13",
|
|
"lessThanOrEqual": "5.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.13",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"cpeApplicability": [
|
|
{
|
|
"nodes": [
|
|
{
|
|
"operator": "OR",
|
|
"negate": false,
|
|
"cpeMatch": [
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.6",
|
|
"versionEndExcluding": "5.10.46"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.6",
|
|
"versionEndExcluding": "5.12.13"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.6",
|
|
"versionEndExcluding": "5.13"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7"
|
|
}
|
|
],
|
|
"title": "mptcp: Fix out of bounds when parsing TCP options",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"type": "CWE",
|
|
"lang": "en",
|
|
"description": "CWE-noinfo Not enough information"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"scope": "UNCHANGED",
|
|
"version": "3.1",
|
|
"baseScore": 6.2,
|
|
"attackVector": "LOCAL",
|
|
"baseSeverity": "MEDIUM",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
|
|
"integrityImpact": "NONE",
|
|
"userInteraction": "NONE",
|
|
"attackComplexity": "LOW",
|
|
"availabilityImpact": "HIGH",
|
|
"privilegesRequired": "NONE",
|
|
"confidentialityImpact": "NONE"
|
|
}
|
|
},
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"timestamp": "2024-05-31T18:50:36.202074Z",
|
|
"id": "CVE-2021-47244",
|
|
"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": "2024-11-05T21:23:21.293Z"
|
|
}
|
|
},
|
|
{
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2024-08-04T05:32:07.998Z"
|
|
},
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |