Description

The png_check_keyword function in pngwutil.c in libpng before 1.0.42, and 1.2.x before 1.2.34, might allow context-dependent attackers to set the value of an arbitrary memory location to zero via vectors involving creation of crafted PNG files with keywords, related to an implicit cast of the '\0' character constant to a NULL pointer. NOTE: some sources incorrectly report this as a double free vulnerability.

References

http://libpng.sourceforge.net/index.html

http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00000.html

http://openwall.com/lists/oss-security/2009/01/09/1

http://secunia.com/advisories/34320

http://secunia.com/advisories/34388

http://security.gentoo.org/glsa/glsa-200903-28.xml

http://sourceforge.net/mailarchive/forum.php?thread_name=4B6F0239C13D0245820603C036D180BC79FBAA%40CABOTUKEXCH01.cabot.local&forum_name=png-mng-implement

http://www.debian.org/security/2009/dsa-1750

http://www.mandriva.com/security/advisories?name=MDVSA-2009:051

https://exchange.xforce.ibmcloud.com/vulnerabilities/48128

Details

Risk Information

CVSS v2