mirror of
https://github.com/fkie-cad/nvd-json-data-feeds.git
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108 lines
4.3 KiB
JSON
108 lines
4.3 KiB
JSON
{
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"id": "CVE-2023-26485",
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"sourceIdentifier": "security-advisories@github.com",
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"published": "2023-03-31T23:15:07.250",
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"lastModified": "2023-11-07T04:09:36.790",
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"vulnStatus": "Modified",
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"descriptions": [
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{
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"lang": "en",
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"value": "cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. This CVE covers quadratic complexity issues when parsing text which leads with either large numbers of `_` characters. This issue has been addressed in version 0.29.0.gfm.10. Users are advised to upgrade. Users unable to upgrade should validate that their input comes from trusted sources.\n\n\n\n\n### Impact\n\nA polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service.\n\n### Proof of concept\n\n```\n$ ~/cmark-gfm$ python3 -c 'pad = \"_\" * 100000; print(pad + \".\" + pad, end=\"\")' | time ./build/src/cmark-gfm --to plaintext\n```\n\nIncreasing the number 10000 in the above commands causes the running time to increase quadratically.\n\n### Patches\n\nThis vulnerability have been patched in 0.29.0.gfm.10.\n\n### Note on cmark and cmark-gfm\n\nXXX: TBD\n\n[cmark-gfm](https://github.com/github/cmark-gfm) is a fork of [cmark](https://github.com/commonmark/cmark) that adds the GitHub Flavored Markdown extensions. The two codebases have diverged over time, but share a common core. These bugs affect both `cmark` and `cmark-gfm`. \n\n### Credit\n\nWe would like to thank @gravypod for reporting this vulnerability.\n\n### References\n\nhttps://en.wikipedia.org/wiki/Time_complexity\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm)\n"
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}
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],
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"metrics": {
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"cvssMetricV31": [
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{
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"source": "nvd@nist.gov",
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"type": "Primary",
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"cvssData": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"exploitabilityScore": 3.9,
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"impactScore": 3.6
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},
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{
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"source": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"type": "Secondary",
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"cvssData": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "LOW",
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"baseScore": 5.3,
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"baseSeverity": "MEDIUM"
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},
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"exploitabilityScore": 3.9,
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"impactScore": 1.4
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}
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]
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},
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"weaknesses": [
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{
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"source": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"type": "Primary",
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"description": [
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{
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"lang": "en",
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"value": "CWE-400"
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},
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{
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"lang": "en",
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"value": "CWE-407"
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}
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]
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}
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],
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"configurations": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:github:cmark-gfm:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.29.0.gfm.10",
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"matchCriteriaId": "E3CE1A70-0583-4858-9DA3-7A4E9717FE3A"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987",
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"source": "security-advisories@github.com",
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"tags": [
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"Patch"
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]
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},
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{
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"url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5",
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"source": "security-advisories@github.com",
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"tags": [
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"Exploit",
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"Vendor Advisory"
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]
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}
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]
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} |