Pngcrush: Buffer overflow

Background

Pngcrush is an optimizer for PNG files.

Description

Carsten Lohrke of Gentoo Linux reported that Pngcrush contains a vulnerable version of zlib (GLSA 200507-19).

Impact

By creating a specially crafted data stream, attackers can overwrite data structures for applications that use Pngcrush, resulting in a Denial of Service and potentially arbitrary code execution.

Workaround

There is no known workaround at this time.

Resolution

All Pngcrush users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=media-gfx/pngcrush-1.6.2"