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RHSA-2016:0012: gnutls security update

Severity CVSS Published Added Modified
4 (AV:N/AC:M/Au:N/C:N/I:P/A:N) January 06, 2016 January 07, 2016 October 29, 2017


The GnuTLS library provides support for cryptographic algorithms and forprotocols such as Transport Layer Security (TLS).A flaw was found in the way TLS 1.2 could use the MD5 hash function forsigning ServerKeyExchange and Client Authentication packets during a TLShandshake. A man-in-the-middle attacker able to force a TLS connection touse the MD5 hash function could use this flaw to conduct collision attacksto impersonate a TLS server or an authenticated TLS client. (CVE-2015-7575)All gnutls users are advised to upgrade to these updated packages, whichcontain a backported patch to correct this issue. For the update to takeeffect, all applications linked to the GnuTLS library must be restarted.

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