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
CVE-2021-40528


To clipboard 

{
   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'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.",
      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'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.",
         id: "GSD-2021-40528",
         modified: "2023-12-13T01:23:25.061810Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
      "cve.org": {
         CVE_data_meta: {
            ASSIGNER: "cve@mitre.org",
            ID: "CVE-2021-40528",
            STATE: "PUBLIC",
         },
         affects: {
            vendor: {
               vendor_data: [
                  {
                     product: {
                        product_data: [
                           {
                              product_name: "n/a",
                              version: {
                                 version_data: [
                                    {
                                       version_value: "n/a",
                                    },
                                 ],
                              },
                           },
                        ],
                     },
                     vendor_name: "n/a",
                  },
               ],
            },
         },
         data_format: "MITRE",
         data_type: "CVE",
         data_version: "4.0",
         description: {
            description_data: [
               {
                  lang: "eng",
                  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'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.",
               },
            ],
         },
         problemtype: {
            problemtype_data: [
               {
                  description: [
                     {
                        lang: "eng",
                        value: "n/a",
                     },
                  ],
               },
            ],
         },
         references: {
            reference_data: [
               {
                  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",
               },
               {
                  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": {
         configurations: {
            CVE_data_version: "4.0",
            nodes: [
               {
                  children: [],
                  cpe_match: [
                     {
                        cpe23Uri: "cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*",
                        cpe_name: [],
                        versionEndExcluding: "1.9.4",
                        vulnerable: true,
                     },
                  ],
                  operator: "OR",
               },
            ],
         },
         cve: {
            CVE_data_meta: {
               ASSIGNER: "cve@mitre.org",
               ID: "CVE-2021-40528",
            },
            data_format: "MITRE",
            data_type: "CVE",
            data_version: "4.0",
            description: {
               description_data: [
                  {
                     lang: "en",
                     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'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.",
                  },
               ],
            },
            problemtype: {
               problemtype_data: [
                  {
                     description: [
                        {
                           lang: "en",
                           value: "CWE-327",
                        },
                     ],
                  },
               ],
            },
            references: {
               reference_data: [
                  {
                     name: "https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1",
                     refsource: "MISC",
                     tags: [
                        "Third Party Advisory",
                     ],
                     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",
                     tags: [
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                     ],
                     url: "https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2",
                  },
                  {
                     name: "https://eprint.iacr.org/2021/923",
                     refsource: "MISC",
                     tags: [
                        "Technical Description",
                        "Third Party Advisory",
                     ],
                     url: "https://eprint.iacr.org/2021/923",
                  },
                  {
                     name: "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320",
                     refsource: "MISC",
                     tags: [
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                     url: "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320",
                  },
                  {
                     name: "GLSA-202210-13",
                     refsource: "GENTOO",
                     tags: [
                        "Third Party Advisory",
                     ],
                     url: "https://security.gentoo.org/glsa/202210-13",
                  },
               ],
            },
         },
         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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