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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.1224 Important: gdm security update 6 September 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: gdm Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 5 Red Hat Enterprise Linux WS/Desktop 5 UNIX variants (UNIX, Linux, OSX) Impact/Access: Modify Arbitrary Files -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2013-4169 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2013-1213.html Comment: This advisory references vulnerabilities in products which run on platforms other than Red Hat. It is recommended that administrators running gdm check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: gdm security update Advisory ID: RHSA-2013:1213-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-1213.html Issue date: 2013-09-05 CVE Names: CVE-2013-4169 ===================================================================== 1. Summary: Updated gdm and initscripts packages that fix one security issue are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 3. Description: The GNOME Display Manager (GDM) provides the graphical login screen, shown shortly after boot up, log out, and when user-switching. A race condition was found in the way GDM handled the X server sockets directory located in the system temporary directory. An unprivileged user could use this flaw to perform a symbolic link attack, giving them write access to any file, allowing them to escalate their privileges to root. (CVE-2013-4169) Note that this erratum includes an updated initscripts package. To fix CVE-2013-4169, the vulnerable code was removed from GDM and the initscripts package was modified to create the affected directory safely during the system boot process. Therefore, this update will appear on all systems, however systems without GDM installed are not affected by this flaw. Red Hat would like to thank the researcher with the nickname vladz for reporting this issue. All users should upgrade to these updated packages, which correct this issue. The system must be rebooted for this update to take effect. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/site/articles/11258 5. Bugs fixed (http://bugzilla.redhat.com/): 988498 - CVE-2013-4169 gdm: TOCTTOU race condition on /tmp/.X11-unix 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gdm-2.16.0-59.el5_9.1.src.rpm ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/initscripts-8.45.42-2.el5_9.1.src.rpm i386: gdm-2.16.0-59.el5_9.1.i386.rpm gdm-debuginfo-2.16.0-59.el5_9.1.i386.rpm gdm-docs-2.16.0-59.el5_9.1.i386.rpm initscripts-8.45.42-2.el5_9.1.i386.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.i386.rpm x86_64: gdm-2.16.0-59.el5_9.1.x86_64.rpm gdm-debuginfo-2.16.0-59.el5_9.1.x86_64.rpm gdm-docs-2.16.0-59.el5_9.1.x86_64.rpm initscripts-8.45.42-2.el5_9.1.x86_64.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gdm-2.16.0-59.el5_9.1.src.rpm ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/initscripts-8.45.42-2.el5_9.1.src.rpm i386: gdm-2.16.0-59.el5_9.1.i386.rpm gdm-debuginfo-2.16.0-59.el5_9.1.i386.rpm gdm-docs-2.16.0-59.el5_9.1.i386.rpm initscripts-8.45.42-2.el5_9.1.i386.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.i386.rpm ia64: gdm-2.16.0-59.el5_9.1.ia64.rpm gdm-debuginfo-2.16.0-59.el5_9.1.ia64.rpm gdm-docs-2.16.0-59.el5_9.1.ia64.rpm initscripts-8.45.42-2.el5_9.1.ia64.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.ia64.rpm ppc: gdm-2.16.0-59.el5_9.1.ppc.rpm gdm-debuginfo-2.16.0-59.el5_9.1.ppc.rpm gdm-docs-2.16.0-59.el5_9.1.ppc.rpm initscripts-8.45.42-2.el5_9.1.ppc.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.ppc.rpm s390x: gdm-2.16.0-59.el5_9.1.s390x.rpm gdm-debuginfo-2.16.0-59.el5_9.1.s390x.rpm gdm-docs-2.16.0-59.el5_9.1.s390x.rpm initscripts-8.45.42-2.el5_9.1.s390x.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.s390x.rpm x86_64: gdm-2.16.0-59.el5_9.1.x86_64.rpm gdm-debuginfo-2.16.0-59.el5_9.1.x86_64.rpm gdm-docs-2.16.0-59.el5_9.1.x86_64.rpm initscripts-8.45.42-2.el5_9.1.x86_64.rpm initscripts-debuginfo-8.45.42-2.el5_9.1.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2013-4169.html https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2013 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFSKNRIXlSAg2UNWIIRAj4YAJ9ENwOuMcy+f7ZD8VHFFniU0aoC1gCgqASG /vYNTQOyHL7KlD2svmN+YA0= =NuON - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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