[arch-security] [ASA-201707-6] lib32-gnutls: denial of service

[Remi Gacogne]

Arch Linux Security Advisory ASA-201707-6
=========================================

Severity: Medium
Date    : 2017-07-11
CVE-ID  : CVE-2017-7507
Package : lib32-gnutls
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-295

Summary
=======

The package lib32-gnutls before version 3.5.13-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 3.5.13-1.

# pacman -Syu "lib32-gnutls>=3.5.13-1"

The problem has been fixed upstream in version 3.5.13.

Workaround
==========

None.

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

GnuTLS version 3.5.12 and earlier is vulnerable to a NULL pointer
dereference while decoding a status response TLS extension with valid
contents. This could lead to a crash of the GnuTLS server application.

Impact
======

A remote attacker can crash a vulnerable TLS server by sending a
crafted status_request extension in a ClientHello message.

References
==========

https://www.gnutls.org/security.html#GNUTLS-SA-2017-4
https://bugzilla.redhat.com/show_bug.cgi?id=1454621
https://security.archlinux.org/CVE-2017-7507

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