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Gentoo Linux Security Advisory GLSA 200511-23 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: chmlib, KchmViewer: Stack-based buffer overflow |
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Date: November 28, 2005 |
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Bugs: #110557 |
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ID: 200511-23 |
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Synopsis |
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======== |
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|
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chmlib and KchmViewer contain a buffer overflow vulnerability which may |
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lead to the execution of arbitrary code. |
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Background |
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========== |
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|
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chmlib is a library for dealing with Microsoft ITSS and CHM format |
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files. KchmViewer is a CHM viewer that includes its own copy of the |
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chmlib library. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 app-doc/chmlib < 0.37.4 >= 0.37.4 |
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2 app-doc/kchmviewer < 1.1 >= 1.1 |
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------------------------------------------------------------------- |
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2 affected packages on all of their supported architectures. |
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------------------------------------------------------------------- |
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|
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Description |
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=========== |
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|
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Sven Tantau reported about a buffer overflow vulnerability in chmlib. |
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The function "_chm_decompress_block()" does not properly perform |
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boundary checking, resulting in a stack-based buffer overflow. |
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|
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Impact |
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====== |
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|
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By convincing a user to open a specially crafted ITSS or CHM file, |
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using KchmViewer or a program makes use of chmlib, a remote attacker |
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could execute arbitrary code with the privileges of the user running |
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the software. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All chmlib users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=app-doc/chmlib-0.37.4" |
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All KchmViewer users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=app-doc/kchmviewer-1.1" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2005-3318 |
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http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3318 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200511-23.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2005 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.0 |
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