Qt: Buffer overflow in the included zlib library

Background

Qt is a cross-platform GUI toolkit used by KDE.

Description

Qt links to a bundled vulnerable version of zlib when emerged with the zlib USE-flag disabled. This may lead to a buffer overflow.

Impact

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

Workaround

Emerge Qt with the zlib USE-flag enabled.

Resolution

All Qt users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=x11-libs/qt-3.3.4-r8"