VULNERABILITY

Oracle Linux: CVE-2021-33560: ELSA-2021-4409: libgcrypt security and bug fix update (MODERATE) (Multiple Advisories)

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Oracle Linux: CVE-2021-33560: ELSA-2021-4409: libgcrypt security and bug fix update (MODERATE) (Multiple Advisories)

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:C/I:N/A:N)
Published
06/02/2021
Created
11/19/2021
Added
11/17/2021
Modified
12/06/2024

Description

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. This, for example, affects use of ElGamal in OpenPGP. A side-channel attack flaw was found in the way libgcrypt implemented Elgamal encryption. This flaw allows an attacker to decrypt parts of ciphertext encrypted using Elgamal, for example, when using OpenPGP. The highest threat from this vulnerability is to confidentiality.

Solution(s)

  • oracle-linux-upgrade-libgcrypt
  • oracle-linux-upgrade-libgcrypt-devel

References

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