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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.0333 Important: kernel-rt security and bug fix update 7 March 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel-rt Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Impact/Access: Root Compromise -- Existing Account Access Privileged Data -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2013-1773 CVE-2013-1772 CVE-2012-4530 CVE-2012-2375 CVE-2011-4131 Reference: ESB-2013.0160 ESB-2012.1201 ESB-2012.1145 ESB-2012.0581 ESB-2012.0221 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2013-0566.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2013:0566-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0566.html Issue date: 2013-03-06 CVE Names: CVE-2012-2375 CVE-2012-4530 CVE-2013-1772 CVE-2013-1773 ===================================================================== 1. Summary: Updated kernel-rt packages that fix several security issues and multiple bugs are now available for Red Hat Enterprise MRG 2.3. The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. Relevant releases/architectures: MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64 3. Description: The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: * A buffer overflow flaw was found in the way UTF-8 characters were converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's FAT file system implementation. A local user able to mount a FAT file system with the "utf8=1" option could use this flaw to crash the system or, potentially, to escalate their privileges. (CVE-2013-1773, Important) * It was found that the RHSA-2012:0333 update did not correctly fix the CVE-2011-4131 issue. A malicious Network File System version 4 (NFSv4) server could return a crafted reply to a GETACL request, causing a denial of service on the client. (CVE-2012-2375, Moderate) * A memory disclosure flaw was found in the way the load_script() function in the binfmt_script binary format handler handled excessive recursions. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space by executing specially-crafted scripts. (CVE-2012-4530, Low) * A flaw was found in the way file permission checks for the "/dev/kmsg" file were performed in restricted root environments (for example, when using a capability-based security model). A local user able to write to this file could cause a denial of service. (CVE-2013-1772, Low) The CVE-2012-2375 issue was discovered by Jian Li of Red Hat. This update also fixes multiple bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section. Users should upgrade to these updated packages, which upgrade the kernel-rt kernel to version kernel-rt-3.6.11-rt28, correct these issues, and fix the bugs noted in the Red Hat Enterprise MRG 2 Technical Notes. 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/knowledge/articles/11258 To install kernel packages manually, use "rpm -ivh [package]". Do not use "rpm -Uvh" as that will remove the running kernel binaries from your system. You may use "rpm -e" to remove old kernels after determining that the new kernel functions properly on your system. 5. Bugs fixed (http://bugzilla.redhat.com/): 773017 - kernel-rt-{debug,trace}-debuginfo conflicts against kernel-debuginfo 822869 - CVE-2012-2375 kernel: incomplete fix for CVE-2011-4131 866596 - RFE: rebase to 3.4 or greater kernel [mrg2.3] 866600 - RFE: adding PTP kernel support as a Tech Preview [mrg2.3] 868285 - CVE-2012-4530 kernel: stack disclosure in binfmt_script load_script() 916075 - CVE-2013-1772 kernel: call_console_drivers() function log prefix stripping DoS 916115 - CVE-2013-1773 kernel: VFAT slab-based buffer overflow 6. Package List: MRG Realtime for RHEL 6 Server v.2: Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/RHEMRG-RHEL6/SRPMS/kernel-rt-3.6.11-rt28.20.el6rt.src.rpm noarch: kernel-rt-doc-3.6.11-rt28.20.el6rt.noarch.rpm kernel-rt-firmware-3.6.11-rt28.20.el6rt.noarch.rpm mrg-rt-release-3.6.11-rt28.20.el6rt.noarch.rpm x86_64: kernel-rt-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-debug-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-debug-devel-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-devel-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-trace-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-trace-devel-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-vanilla-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.6.11-rt28.20.el6rt.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-2012-2375.html https://www.redhat.com/security/data/cve/CVE-2012-4530.html https://www.redhat.com/security/data/cve/CVE-2013-1772.html https://www.redhat.com/security/data/cve/CVE-2013-1773.html https://access.redhat.com/security/updates/classification/#important https://rhn.redhat.com/errata/RHSA-2012-0333.html https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_MRG/2/html/Technical_Notes/RHSA-2013-0566.html 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) iD8DBQFRN6EuXlSAg2UNWIIRAkMDAJ9ciFzFQKycMhyu/BD7+dBkslHheQCff2L2 lDDkn79lGnfsT7/B1L6Fv5U= =aEab - -----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. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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