[arch-security] [ASA-201508-8] gnutls: denial of service

[Remi Gacogne]

Arch Linux Security Advisory ASA-201508-8
=========================================

Severity: Medium
Date    : 2015-08-25
CVE-ID  : CVE-2015-6251
Package : gnutls
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package gnutls before version 3.4.4.1-1 is vulnerable to remote
denial of service.

Resolution
==========

Upgrade to 3.4.4.1-1.

# pacman -Syu "gnutls>=3.4.4.1-1"

The problem has been fixed upstream in version 3.4.4 and 3.3.17.

Workaround
==========

None.

Description
===========

Kurt Roeckx reported that decoding a specific certificate with very long
DistinguishedName (DN) entries leads to double free, which may result to
a denial of service. Since the DN decoding occurs in almost all
applications using certificates it is recommended to upgrade the latest
GnuTLS version fixing the issue.

Impact
======

A remote attacker might be able to remotely crash a vulnerable
application by supplying a crafted certificate with a very long DN.

References
==========

http://www.gnutls.org/security.html#GNUTLS-SA-2015-3
https://access.redhat.com/security/cve/CVE-2015-6251

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