- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200804-15 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: libpng: Execution of arbitrary code Date: April 15, 2008 Bugs: #217047 ID: 200804-15 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== A vulnerability in libpng may allow for execution of arbitrary code in certain applications that handle untrusted images. Background ========== libpng is a free ANSI C library used to process and manipulate PNG images. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 media-libs/libpng < 1.2.26-r1 >= 1.2.26-r1 Description =========== Tavis Ormandy of the Google Security Team discovered that libpng does not handle zero-length unknown chunks in PNG files correctly, which might lead to memory corruption in applications that call png_set_read_user_chunk_fn() or png_set_keep_unknown_chunks(). Impact ====== A remote attacker could entice a user or automated system to process a specially crafted PNG image in an application using libpng and possibly execute arbitrary code with the privileges of the user running the application. Note that processing of unknown chunks is disabled by default in most PNG applications, but some such as ImageMagick are affected. Workaround ========== There is no known workaround at this time. Resolution ========== All libpng users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.26-r1" References ========== [ 1 ] CVE-2008-1382 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1382 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200804-15.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@xxxxxxxxxx or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2008 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5
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