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Gentoo: GLSA-200511-23 Critical: chmlib Buffer Overflow Attack

chmlib and KchmViewer contain a buffer overflow vulnerability which may lead to the execution of arbitrary code.. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200511-23 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: chmlib, KchmViewer: Stack-based buffer overflow Date: November 28, 2005 Bugs: #110557 ID: 200511-23 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= chmlib and KchmViewer contain a buffer overflow vulnerability which may lead to the execution of arbitrary code. Background ========= chmlib is a library for dealing with Microsoft ITSS and CHM format files. KchmViewer is a CHM viewer that includes its own copy of the chmlib library. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-doc/chmlib < 0.37.4 > = 0.37.4 2 app-doc/kchmviewer < 1.1 > = 1.1 ------------------------------------------------------------------- 2 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description ========== Sven Tantau reported about a buffer overflow vulnerability in chmlib. The function "_chm_decompress_block()" does not properly perform boundary checking, resulting in a stack-based buffer overflow. Impact ===== By convincing a user to open a specially crafted ITSS or CHM file, using KchmViewer or a program makes use of chmlib, a remote attacker could execute arbitrary code with the privileges of the userrunning the software. Workaround ========= There is no known workaround at this time. Resolution ========= All chmlib users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =app-doc/chmlib-0.37.4" All KchmViewer users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =app-doc/kchmviewer-1.1" References ========= [ 1 ] CVE-2005-3318 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/200511-23 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 This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at https://bugs.gentoo.org/. License ====== Copyright 2005 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. https://creativecommons.org/licenses/by-sa/2.0/ . A security flaw in libchm and KchmViewer may permit the running of unauthorized code. Update immediately to ensure your safety.. chmlib security,chmlib buffer overflow,kchmviewer update,gentoo advisory. . LinuxSecurity.com Team

Nov 28, 2005 Gentoo