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Oracle Linux: CVE-2020-13777: ELSA-2020-2637: gnutls security update (IMPORTANT) (Multiple Advisories)

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Oracle Linux: CVE-2020-13777: ELSA-2020-2637: gnutls security update (IMPORTANT) (Multiple Advisories)

Severity
7
CVSS
(AV:N/AC:H/Au:N/C:C/I:C/A:N)
Published
06/03/2020
Created
07/24/2020
Added
10/16/2024
Modified
10/17/2024

Description

GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application. A flaw was found in GnuTLS, in versions starting from 3.6.4, where it does not session the ticket encryption key in a secure fashion by the application which is connecting. This flaw allows an attacker to craft a man-in-the-middle-attack, with the ability to bypass the TLS1.3 authentication and also recover older conversations when TLS1.2 is in use. The highest threat to this flaw is to confidentiality and integrity.

Solution(s)

  • oracle-linux-upgrade-gnutls
  • oracle-linux-upgrade-gnutls-c
  • oracle-linux-upgrade-gnutls-dane
  • oracle-linux-upgrade-gnutls-devel
  • oracle-linux-upgrade-gnutls-utils

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