ghsa-g9p5-p7h5-p2wg
Vulnerability from github
Published
2022-05-24 19:04
Modified
2022-05-24 19:04
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Details

Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. (There is also an interoperability problem because the selection of the k integer value does not properly consider the differences between basic ElGamal encryption and generalized ElGamal encryption.) This, for example, affects use of ElGamal in OpenPGP.

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{
   affected: [],
   aliases: [
      "CVE-2021-33560",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-203",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2021-06-08T11:15:00Z",
      severity: "HIGH",
   },
   details: "Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. (There is also an interoperability problem because the selection of the k integer value does not properly consider the differences between basic ElGamal encryption and generalized ElGamal encryption.) This, for example, affects use of ElGamal in OpenPGP.",
   id: "GHSA-g9p5-p7h5-p2wg",
   modified: "2022-05-24T19:04:21Z",
   published: "2022-05-24T19:04:21Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2021-33560",
      },
      {
         type: "WEB",
         url: "https://dev.gnupg.org/T5305",
      },
      {
         type: "WEB",
         url: "https://dev.gnupg.org/T5328",
      },
      {
         type: "WEB",
         url: "https://dev.gnupg.org/T5466",
      },
      {
         type: "WEB",
         url: "https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61",
      },
      {
         type: "WEB",
         url: "https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html",
      },
      {
         type: "WEB",
         url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB",
      },
      {
         type: "WEB",
         url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL",
      },
      {
         type: "WEB",
         url: "https://security.gentoo.org/glsa/202210-13",
      },
      {
         type: "WEB",
         url: "https://www.oracle.com/security-alerts/cpuapr2022.html",
      },
      {
         type: "WEB",
         url: "https://www.oracle.com/security-alerts/cpujan2022.html",
      },
      {
         type: "WEB",
         url: "https://www.oracle.com/security-alerts/cpujul2022.html",
      },
      {
         type: "WEB",
         url: "https://www.oracle.com/security-alerts/cpuoct2021.html",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
         type: "CVSS_V3",
      },
   ],
}


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