Red Hat Security Advisory: kernel-rt security and bug fix update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:1491 Final 1 1 2012-12-04T19:02:00Z Current version 2012-12-04T19:02:00Z 2012-12-04T19:02:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-12-04T20:03:01Z Updated kernel-rt packages that fix several security issues and multiple bugs are now available for Red Hat Enterprise MRG 2.2. 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. The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: * A flaw was found in the way Netlink messages without SCM_CREDENTIALS (used for authentication) data set were handled. When not explicitly set, the data was sent but with all values set to 0, including the process ID and user ID, causing the Netlink message to appear as if it were sent with root privileges. A local, unprivileged user could use this flaw to send spoofed Netlink messages to an application, possibly resulting in the application performing privileged operations if it relied on SCM_CREDENTIALS data for the authentication of Netlink messages. (CVE-2012-3520, Important) * A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. (CVE-2012-4508, Important) * A use-after-free flaw was found in the Linux kernel's memory management subsystem in the way quota handling for huge pages was performed. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2012-2133, Moderate) * A use-after-free flaw was found in the madvise() system call implementation in the Linux kernel. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2012-3511, Moderate) * A divide-by-zero flaw was found in the TCP Illinois congestion control algorithm implementation in the Linux kernel. If the TCP Illinois congestion control algorithm were in use (the sysctl net.ipv4.tcp_congestion_control variable set to "illinois"), a local, unprivileged user could trigger this flaw and cause a denial of service. (CVE-2012-4565, Moderate) * An information leak flaw was found in the uname() system call implementation in the Linux kernel. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space by setting the UNAME26 personality and then calling the uname() system call. (CVE-2012-0957, Low) * Buffer overflow flaws were found in the udf_load_logicalvol() function in the Universal Disk Format (UDF) file system implementation in the Linux kernel. An attacker with physical access to a system could use these flaws to cause a denial of service or escalate their privileges. (CVE-2012-3400, Low) * A flaw was found in the way the msg_namelen variable in the rds_recvmsg() function of the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation was initialized. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space. (CVE-2012-3430, Low) Red Hat would like to thank Pablo Neira Ayuso for reporting CVE-2012-3520; Theodore Ts'o for reporting CVE-2012-4508; Shachar Raindel for reporting CVE-2012-2133; and Kees Cook for reporting CVE-2012-0957. Upstream acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The CVE-2012-4565 issue was discovered by Rodrigo Freire of Red Hat, and the CVE-2012-3430 issue was discovered by the Red Hat InfiniBand team. 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-3.2.33-rt50, and correct these issues. The system must be rebooted for this update to take effect. Please see https://www.redhat.com/footer/terms-of-use.html Copyright © 2012 Red Hat, Inc. All rights reserved. Important https://rhn.redhat.com/errata/RHSA-2012-1491.html https://rhn.redhat.com/errata/RHSA-2012-1491.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_MRG/2/html/Technical_Notes/sec-Red_Hat_Enterprise_Linux_6.html#RHSA-2012-1491 https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_MRG/2/html/Technical_Notes/sec-Red_Hat_Enterprise_Linux_6.html#RHSA-2012-1491 https://bugzilla.redhat.com/show_bug.cgi?id=843130 https://bugzilla.redhat.com/show_bug.cgi?id=843130 https://bugzilla.redhat.com/show_bug.cgi?id=856243 https://bugzilla.redhat.com/show_bug.cgi?id=856243 https://bugzilla.redhat.com/show_bug.cgi?id=859226 https://bugzilla.redhat.com/show_bug.cgi?id=859226 https://bugzilla.redhat.com/show_bug.cgi?id=864568 https://bugzilla.redhat.com/show_bug.cgi?id=864568 MRG Realtime for RHEL 6 Server v.2 kernel-rt-3.2.33-rt50.66.el6rt.src.rpm kernel-rt-3.2.33-rt50.66.el6rt as a component of MRG Realtime for RHEL 6 Server v.2 An information leak flaw was found in the uname() system call implementation in the Linux kernel. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space by setting the UNAME26 personality and then calling the uname() system call. 2012-10-03T00:00:00Z 2012-10-09T00:00:00Z CVE-2012-0957 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Low 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-0957.html CVE-2012-0957 https://bugzilla.redhat.com/show_bug.cgi?id=862877 bz#862877: CVE-2012-0957 kernel: uts: stack memory leak in UNAME26 Red Hat would like to thank Kees Cook for reporting this issue. A use-after-free flaw was found in the Linux kernel's memory management subsystem in the way quota handling for huge pages was performed. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges. 2012-04-22T00:00:00Z 2012-03-22T00:00:00Z CVE-2012-2133 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Moderate 6.2 AV:L/AC:H/Au:N/C:C/I:C/A:C 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-2133.html CVE-2012-2133 https://bugzilla.redhat.com/show_bug.cgi?id=817430 bz#817430: CVE-2012-2133 kernel: use after free bug in "quota" handling Red Hat would like to thank Shachar Raindel for reporting this issue. Buffer overflow flaws were found in the udf_load_logicalvol() function in the Universal Disk Format (UDF) file system implementation in the Linux kernel. An attacker with physical access to a system could use these flaws to cause a denial of service or escalate their privileges. 2012-07-03T00:00:00Z 2012-06-27T00:00:00Z CVE-2012-3400 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Low 6.2 AV:L/AC:H/Au:N/C:C/I:C/A:C 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-3400.html CVE-2012-3400 https://bugzilla.redhat.com/show_bug.cgi?id=843139 bz#843139: CVE-2012-3400 kernel: udf: buffer overflow when parsing sparing table A flaw was found in the way the msg_namelen variable in the rds_recvmsg() function of the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation was initialized. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space. 2012-05-08T00:00:00Z 2012-07-23T00:00:00Z CVE-2012-3430 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Low 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-3430.html CVE-2012-3430 https://bugzilla.redhat.com/show_bug.cgi?id=820039 bz#820039: CVE-2012-3430 kernel: recv{from,msg}() on an rds socket can leak kernel memory This issue was discovered by the Red Hat InfiniBand team. A use-after-free flaw was found in the madvise() system call implementation in the Linux kernel. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges. 2012-07-16T00:00:00Z 2012-07-06T00:00:00Z CVE-2012-3511 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Moderate 6.2 AV:L/AC:H/Au:N/C:C/I:C/A:C 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-3511.html CVE-2012-3511 https://bugzilla.redhat.com/show_bug.cgi?id=849734 bz#849734: CVE-2012-3511 kernel: mm: use-after-free in madvise_remove() A flaw was found in the way Netlink messages without SCM_CREDENTIALS (used for authentication) data set were handled. When not explicitly set, the data was sent but with all values set to 0, including the process ID and user ID, causing the Netlink message to appear as if it were sent with root privileges. A local, unprivileged user could use this flaw to send spoofed Netlink messages to an application, possibly resulting in the application performing privileged operations if it relied on SCM_CREDENTIALS data for the authentication of Netlink messages. 2012-08-20T00:00:00Z 2012-08-21T00:00:00Z CVE-2012-3520 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Important 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-3520.html CVE-2012-3520 https://bugzilla.redhat.com/show_bug.cgi?id=850449 bz#850449: CVE-2012-3520 kernel: af_netlink: invalid handling of SCM_CREDENTIALS passing Red Hat would like to thank Pablo Neira Ayuso for reporting this issue. A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. 2012-10-23T00:00:00Z CVE-2012-4508 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Important 4.9 AV:L/AC:L/Au:N/C:C/I:N/A:N 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-4508.html CVE-2012-4508 https://bugzilla.redhat.com/show_bug.cgi?id=869904 bz#869904: CVE-2012-4508 kernel: ext4: AIO vs fallocate stale data exposure Red Hat would like to thank Theodore Ts'o for reporting this issue. Upstream acknowledges Dmitry Monakhov as the original reporter. Upstream fix: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=dee1f973ca341c266229faa5a1a5bb268bed3531 A divide-by-zero flaw was found in the TCP Illinois congestion control algorithm implementation in the Linux kernel. If the TCP Illinois congestion control algorithm were in use (the sysctl net.ipv4.tcp_congestion_control variable set to "illinois"), a local, unprivileged user could trigger this flaw and cause a denial of service. 2012-10-15T00:00:00Z 2012-10-31T00:00:00Z CVE-2012-4565 6Server-MRG-Realtime-2:kernel-rt-3.2.33-rt50.66.el6rt Moderate 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C 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. https://rhn.redhat.com/errata/RHSA-2012-1491.html https://www.redhat.com/security/data/cve/CVE-2012-4565.html CVE-2012-4565 https://bugzilla.redhat.com/show_bug.cgi?id=871848 bz#871848: CVE-2012-4565 kernel: net: divide by zero in tcp algorithm illinois This issue was discovered by Rodrigo Freire of Red Hat.