TITLE: libpng "png_set_strip_alpha()" Buffer Overflow Vulnerability
SECUNIA ADVISORY ID: SA18654
VERIFY ADVISORY: http://secunia.com/advisories/18654/
CRITICAL: Moderately critical
IMPACT: DoS, System access
WHERE: >From remote
SOFTWARE: libpng 1.x http://secunia.com/product/3439/
DESCRIPTION: A vulnerability has been reported in libpng, which can be exploited by malicious people to cause a DoS (Denial of Service) against applications using libpng or potentially compromise a vulnerable system.
The vulnerability is caused due to a boundary error in the "png_set_strip_alpha()" function within the handling of a PNG image file containing alpha channels. This can be exploited to cause a heap-based buffer overflow via a specially-crafted PNG file.
Successful exploitation requires that the application is written to strip the alpha channel from a PNG file.
The vulnerability has been reported in versions 1.0.16, 1.0.17, 1.2.6, and 1.2.7.
SOLUTION: Update to version 1.0.18 or 1.2.8. http://www.libpng.org/pub/png/libpng.html
PROVIDED AND/OR DISCOVERED BY: Reported by vendor.
ORIGINAL ADVISORY: Red Hat Bugzilla: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=179455
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