From koon@gentoo.org Fri Sep 30 09:05:00 2005 From: Thierry Carrez To: gentoo-announce@lists.gentoo.org Cc: full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com Date: Fri, 30 Sep 2005 15:02:11 +0200 Subject: [Full-disclosure] [ GLSA 200509-21 ] Hylafax: Insecure temporary file creation in xferfaxstats script - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200509-21 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Hylafax: Insecure temporary file creation in xferfaxstats script Date: September 30, 2005 Bugs: #106882 ID: 200509-21 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Hylafax is vulnerable to linking attacks, potentially allowing a local user to overwrite arbitrary files. Background ========== Hylafax is a client-server fax package for class 1 and 2 fax modems. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/hylafax < 4.2.2 *>= 4.2.0-r3 *>= 4.2.1-r2 >= 4.2.2 Description =========== Javier Fernandez-Sanguino has discovered that xferfaxstats cron script supplied by Hylafax insecurely creates temporary files with predictable filenames. Impact ====== A local attacker could create symbolic links in the temporary file directory, pointing to a valid file somewhere on the filesystem. When the xferfaxstats script of Hylafax is executed, this would result in the file being overwritten with the rights of the user running the script, which typically is the root user. Workaround ========== There is no known workaround at this time. Resolution ========== All Hylafax users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose net-misc/hylafax References ========== [ 1 ] Original bug report http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=329384 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200509-21.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 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. http://creativecommons.org/licenses/by-sa/2.0 [ Part 1.2, "OpenPGP digital signature" Application/PGP-SIGNATURE ] [ 196bytes. ] [ Unable to print this part. ] [ Part 2: "Attached Text" ] _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/