gsd-2021-20305
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-20305",
"description": "A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA \u0026 ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.",
"id": "GSD-2021-20305",
"references": [
"https://www.suse.com/security/cve/CVE-2021-20305.html",
"https://www.debian.org/security/2021/dsa-4933",
"https://access.redhat.com/errata/RHSA-2021:2760",
"https://access.redhat.com/errata/RHSA-2021:2758",
"https://access.redhat.com/errata/RHSA-2021:2356",
"https://access.redhat.com/errata/RHSA-2021:2280",
"https://access.redhat.com/errata/RHSA-2021:1246",
"https://access.redhat.com/errata/RHSA-2021:1245",
"https://access.redhat.com/errata/RHSA-2021:1206",
"https://access.redhat.com/errata/RHSA-2021:1145",
"https://ubuntu.com/security/CVE-2021-20305",
"https://advisories.mageia.org/CVE-2021-20305.html",
"https://security.archlinux.org/CVE-2021-20305",
"https://linux.oracle.com/cve/CVE-2021-20305.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
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"id": "GSD-2021-20305",
"modified": "2023-12-13T01:23:12.727820Z",
"schema_version": "1.4.0"
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}
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"cwe_ids": [
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"CWE-787",
"CWE-937"
],
"date": "2021-12-06",
"description": "A flaw was found in Nettle, where several Nettle signature verification functions (GOST DSA, EDDSA \u0026 ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.",
"fixed_versions": [],
"identifier": "CVE-2021-20305",
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],
"not_impacted": "",
"package_slug": "conan/nettle",
"pubdate": "2021-04-05",
"solution": "Unfortunately, there is no solution available yet.",
"title": "Use of a Broken or Risky Cryptographic Algorithm",
"urls": [
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"https://bugzilla.redhat.com/show_bug.cgi?id=1942533"
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"impact": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 6.8,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
"version": "2.0"
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"exploitabilityScore": 8.6,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": false
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"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"
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"exploitabilityScore": 2.2,
"impactScore": 5.9
}
},
"lastModifiedDate": "2021-12-06T13:57Z",
"publishedDate": "2021-04-05T22:15Z"
}
}
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.