gsd-2021-40528
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-40528",
"description": "The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver\u0027s public key, the generator defined by the receiver\u0027s public key, and the sender\u0027s ephemeral exponents can lead to a cross-configuration attack against OpenPGP.",
"id": "GSD-2021-40528",
"references": [
"https://www.suse.com/security/cve/CVE-2021-40528.html",
"https://ubuntu.com/security/CVE-2021-40528",
"https://advisories.mageia.org/CVE-2021-40528.html",
"https://access.redhat.com/errata/RHSA-2022:5311"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-40528"
],
"details": "The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver\u0027s public key, the generator defined by the receiver\u0027s public key, and the sender\u0027s ephemeral exponents can lead to a cross-configuration attack against OpenPGP.",
"id": "GSD-2021-40528",
"modified": "2023-12-13T01:23:25.061810Z",
"schema_version": "1.4.0"
}
},
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"affects": {
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"product_name": "n/a",
"version": {
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"version_value": "n/a"
}
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"value": "The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver\u0027s public key, the generator defined by the receiver\u0027s public key, and the sender\u0027s ephemeral exponents can lead to a cross-configuration attack against OpenPGP."
}
]
},
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"name": "https://eprint.iacr.org/2021/923",
"refsource": "MISC",
"url": "https://eprint.iacr.org/2021/923"
},
{
"name": "https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1",
"refsource": "MISC",
"url": "https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1"
},
{
"name": "https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2",
"refsource": "MISC",
"url": "https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2"
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{
"name": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320",
"refsource": "MISC",
"url": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320"
},
{
"name": "GLSA-202210-13",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/202210-13"
}
]
}
},
"nvd.nist.gov": {
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"nodes": [
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"cpe23Uri": "cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndExcluding": "1.9.4",
"vulnerable": true
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}
]
},
"problemtype": {
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},
{
"name": "https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2",
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{
"name": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320",
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{
"name": "GLSA-202210-13",
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},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 2.6,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:H/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "LOW",
"userInteractionRequired": false
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 3.6
}
},
"lastModifiedDate": "2022-12-07T01:36Z",
"publishedDate": "2021-09-06T19:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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.
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