Tobias Stoeckmann discovered that cache files are insufficiently validated in fontconfig, a generic font configuration library. An attacker can trigger arbitrary free() calls, which in turn allows double free attacks and therefore arbitrary code execution. In combination with

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Debian Security Advisory DSA-3644-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
August 08, 2016                       https://www.debian.org/security/faq
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Package        : fontconfig
CVE ID         : CVE-2016-5384
Debian Bug     : 833570

Tobias Stoeckmann discovered that cache files are insufficiently
validated in fontconfig, a generic font configuration library. An
attacker can trigger arbitrary free() calls, which in turn allows double
free attacks and therefore arbitrary code execution. In combination with
setuid binaries using crafted cache files, this could allow privilege
escalation.

For the stable distribution (jessie), this problem has been fixed in
version 2.11.0-6.3+deb8u1.

For the unstable distribution (sid), this problem has been fixed in
version 2.11.0-6.5.

We recommend that you upgrade your fontconfig packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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