RHSA-2013:0747 - Security Advisory

Topic

Updated kernel packages that fix several security issues and three bugs are
now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
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.

Description

The kernel 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 Xen netback driver implementation in the Linux

kernel. A privileged guest user with access to a para-virtualized network
device could use this flaw to cause a long loop in netback, leading to a
denial of service that could potentially affect the entire system.
(CVE-2013-0216, Moderate)

• A flaw was found in the Xen PCI device back-end driver implementation in

the Linux kernel. A privileged guest user in a guest that has a PCI
passthrough device could use this flaw to cause a denial of service that
could potentially affect the entire system. (CVE-2013-0231, Moderate)

• A NULL pointer dereference flaw was found in the IP packet transformation

framework (XFRM) implementation in the Linux kernel. A local user who has
the CAP_NET_ADMIN capability could use this flaw to cause a denial of
service. (CVE-2013-1826, Moderate)

• Information leak flaws were found in the XFRM implementation in the

Linux kernel. A local user who has the CAP_NET_ADMIN capability could use
these flaws to leak kernel stack memory to user-space. (CVE-2012-6537, Low)

• An information leak flaw was found in the logical link control (LLC)

implementation in the Linux kernel. A local, unprivileged user could use
this flaw to leak kernel stack memory to user-space. (CVE-2012-6542, Low)

• Two information leak flaws were found in the Linux kernel's Asynchronous

Transfer Mode (ATM) subsystem. A local, unprivileged user could use these
flaws to leak kernel stack memory to user-space. (CVE-2012-6546, Low)

• An information leak flaw was found in the TUN/TAP device driver in the

Linux kernel's networking implementation. A local user with access to a
TUN/TAP virtual interface could use this flaw to leak kernel stack memory
to user-space. (CVE-2012-6547, Low)

Red Hat would like to thank the Xen project for reporting the CVE-2013-0216
and CVE-2013-0231 issues.

This update also fixes the following bugs:

• The IPv4 code did not correctly update the Maximum Transfer Unit (MTU) of

the designed interface when receiving ICMP Fragmentation Needed packets.
Consequently, a remote host did not respond correctly to ping attempts.
With this update, the IPv4 code has been modified so the MTU of the
designed interface is adjusted as expected in this situation. The ping
command now provides the expected output. (BZ#923353)

• Previously, the be2net code expected the last word of an MCC completion

message from the firmware to be transferred by direct memory access (DMA)
at once. However, this is not always true, and could therefore cause the
BUG_ON() macro to be triggered in the be_mcc_compl_is_new() function,
consequently leading to a kernel panic. The BUG_ON() macro has been
removed from be_mcc_compl_is_new(), and the kernel panic no longer occurs
in this scenario. (BZ#923910)

• Previously, the NFSv3 server incorrectly converted 64-bit cookies to

32-bit. Consequently, the cookies became invalid, which affected all file
system operations depending on these cookies, such as the READDIR operation
that is used to read entries from a directory. This led to various
problems, such as exported directories being empty or displayed
incorrectly, or an endless loop of the READDIRPLUS procedure which could
potentially cause a buffer overflow. This update modifies knfsd code so
that 64-bit cookies are now handled correctly and all file system
operations work as expected. (BZ#924087)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

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.

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.9 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.9 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.9 i386
• Red Hat Enterprise Linux Server - AUS 5.9 ia64
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.9 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.9 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386
• Red Hat Enterprise Linux Server - AUS 5.9 x86_64
• Red Hat Enterprise Linux Server - AUS 5.9 i386
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.9 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.9 i386

Fixes

• BZ - 910874 - CVE-2013-0231 kernel: xen: pciback DoS via not rate limited log messages
• BZ - 910883 - CVE-2013-0216 CVE-2013-0217 kernel: xen: Linux netback DoS via malicious guest ring.
• BZ - 919384 - CVE-2013-1826 Kernel: xfrm_user: return error pointer instead of NULL
• BZ - 922322 - CVE-2012-6542 Kernel: llc: information leak via getsockname
• BZ - 922344 - CVE-2012-6547 Kernel: net/tun: ioctl() based information leaks
• BZ - 922383 - CVE-2012-6546 Kernel: atm: information leak in getsockopt & getsockname
• BZ - 922424 - CVE-2012-6537 Kernel: xfrm_user information leaks copy_to_user_

CVEs

• CVE-2012-6547
• CVE-2012-6546
• CVE-2013-0216
• CVE-2012-6542
• CVE-2013-1826
• CVE-2013-0231
• CVE-2012-6537

References

• https://access.redhat.com/security/updates/classification/#moderate