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[ GLSA 200501-02 ] a2ps: Insecure temporary files handling
From: Thierry Carrez <koon () gentoo org>
Date: Tue, 04 Jan 2005 22:33:02 +0100
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200501-02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: a2ps: Insecure temporary files handling Date: January 04, 2005 Bugs: #75784 ID: 200501-02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== The fixps and psmandup scripts in the a2ps package are vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files. Background ========== a2ps is an Any to Postscript filter that can convert to Postscript from many filetypes. fixps is a script that fixes errors in Postscript files. psmandup produces a Postscript file for printing in manual duplex mode. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-text/a2ps < 4.13c-r2 >= 4.13c-r2 Description =========== Javier Fernandez-Sanguino Pena discovered that the a2ps package contains two scripts that create insecure temporary files (fixps and psmandup). Impact ====== A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When fixps or psmandup is executed, this would result in the file being overwritten with the rights of the user running the utility. Workaround ========== There is no known workaround at this time. Resolution ========== All a2ps users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-text/a2ps-4.13c-r2" References ========== [ 1 ] Secunia SA13641 http://secunia.com/advisories/13641/ [ 2 ] CAN-2004-1170 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1170 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200501-02.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 () gentoo org or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2004 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/2.0
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- [ GLSA 200501-02 ] a2ps: Insecure temporary files handling Thierry Carrez (Jan 04)