[SECURITY] [DSA 2843-1] graphviz security update

Debian Security Advisory DSA-2843-1 [email protected]
http://www.debian.org/security/ Salvatore Bonaccorso
January 13, 2014 http://www.debian.org/security/faq

Package : graphviz
Vulnerability : buffer overflow
Problem type : local (remote)
Debian-specific: no
CVE ID : CVE-2014-0978 CVE-2014-1236
Debian Bug : 734745

Two buffer overflow vulnerabilities were reported in Graphviz, a rich
collection of graph drawing tools. The Common Vulnerabilities and
Exposures project identifies the following issues:

CVE-2014-0978

It was discovered that user-supplied input used in the yyerror()
function in lib/cgraph/scan.l is not bound-checked before beeing
copied into an insufficiently sized memory buffer. A
context-dependent attacker could supply a specially crafted input
file containing a long line to cause a stack-based buffer overlow,
resulting in a denial of service (application crash) or potentially
allowing the execution of arbitrary code.

CVE-2014-1236

Sebastian Krahmer reported an overflow condition in the chkNum()
function in lib/cgraph/scan.l that is triggered as the used regular
expression accepts an arbitrary long digit list. With a specially
crafted input file, a context-dependent attacker can cause a
stack-based buffer overflow, resulting in a denial of service
(application crash) or potentially allowing the execution of
arbitrary code.

For the oldstable distribution (squeeze), these problems have been fixed in
version 2.26.3-5+squeeze2.

For the stable distribution (wheezy), these problems have been fixed in
version 2.26.3-14+deb7u1.

For the unstable distribution (sid), these problems will be fixed soon.

We recommend that you upgrade your graphviz packages.

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

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