RHSA-2007:0014 - Security Advisory

Topic

Updated kernel packages that fix several security issues in the Red Hat
Enterprise Linux 4 kernel are now available.

This security advisory has been rated as having important security impact
by the Red Hat Security Response Team.

Description

The Linux kernel handles the basic functions of the operating system.

These new kernel packages contain fixes for the security issues described
below:

• a flaw in the get_fdb_entries function of the network bridging support

that allowed a local user to cause a denial of service (crash) or allow a
potential privilege escalation (CVE-2006-5751, Important)

• an information leak in the _block_prepare_write function that allowed a

local user to read kernel memory (CVE-2006-4813, Important)

• an information leak in the copy_from_user() implementation on s390 and

s390x platforms that allowed a local user to read kernel memory
(CVE-2006-5174, Important)

• a flaw in the handling of /proc/net/ip6_flowlabel that allowed a local

user to cause a denial of service (infinite loop) (CVE-2006-5619, Important)

• a flaw in the AIO handling that allowed a local user to cause a denial of

service (panic) (CVE-2006-5754, Important)

• a race condition in the mincore system core that allowed a local user to

cause a denial of service (system hang) (CVE-2006-4814, Moderate)

• a flaw in the ELF handling on ia64 and sparc architectures which

triggered a cross-region memory mapping and allowed a local user to cause a
denial of service (CVE-2006-4538, Moderate)

• a flaw in the dev_queue_xmit function of the network subsystem that

allowed a local user to cause a denial of service (data corruption)
(CVE-2006-6535, Moderate)

• a flaw in the handling of CAPI messages over Bluetooth that allowed a

remote system to cause a denial of service or potential code execution.
This flaw is only exploitable if a privileged user establishes a connection
to a malicious remote device (CVE-2006-6106, Moderate)

• a flaw in the listxattr system call that allowed a local user to cause a

denial of service (data corruption) or potential privilege escalation. To
successfully exploit this flaw the existence of a bad inode is required
first (CVE-2006-5753, Moderate)

• a flaw in the __find_get_block_slow function that allowed a local

privileged user to cause a denial of service (CVE-2006-5757, Low)

• various flaws in the supported filesystems that allowed a local

privileged user to cause a denial of service (CVE-2006-5823, CVE-2006-6053,
CVE-2006-6054, CVE-2006-6056, Low)

In addition to the security issues described above, fixes for the following
bugs were included:

• initialization error of the tg3 driver with some BCM5703x network card
• a memory leak in the audit subsystem
• x86_64 nmi watchdog timeout is too short
• ext2/3 directory reads fail intermittently

Red Hat would like to thank Dmitriy Monakhov and Kostantin Khorenko for
reporting issues fixed in this erratum.

All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels
to the packages associated with their machine architecture and
configurations as listed in this erratum.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via Red Hat Network. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 180663 - CVE-2006-4814 Race condition in mincore can cause "ps -ef" to hang
• BZ - 205335 - CVE-2006-4538 Local DoS with corrupted ELF
• BZ - 206328 - CVE-2006-5757 Linux kernel Filesystem Mount Dead Loop
• BZ - 207463 - CVE-2006-4813 Information leak in __block_prepare_write()
• BZ - 209435 - CVE-2006-5174 copy_from_user information leak on s390
• BZ - 212144 - CVE-2006-6535 unbalanced local_bh_enable() in dev_queue_xmit()
• BZ - 213214 - CVE-2006-5619 Lockup via /proc/net/ip6_flowlabel
• BZ - 213921 - SAN file systems becoming read-only
• BZ - 214288 - CVE-2006-5757 ISO9660 __find_get_block_slow() denial of service
• BZ - 216452 - CVE-2006-5751 Linux kernel get_fdb_entries() integer overflow
• BZ - 216958 - CVE-2006-5823 zlib_inflate memory corruption
• BZ - 217011 - CVE-2006-6056 SELinux superblock_doinit denial of service
• BZ - 217021 - CVE-2006-6054 ext2_check_page denial of service
• BZ - 217030 - CVE-2006-6053 ext3fs_dirhash denial of service
• BZ - 218602 - CVE-2006-6106 Multiple problems in net/bluetooth/cmtp/capi.c
• BZ - 220677 - CVE-2006-5753 listxattr syscall can corrupt user space programs
• BZ - 220971 - CVE-2006-5754 kernel panic in aio_free_ring()

CVEs

• CVE-2006-5174
• CVE-2006-5754
• CVE-2006-5823
• CVE-2006-5757
• CVE-2006-5751
• CVE-2006-4538
• CVE-2006-5753
• CVE-2006-6106
• CVE-2006-6535
• CVE-2006-4813
• CVE-2006-4814
• CVE-2006-6056
• CVE-2006-6054
• CVE-2006-5619
• CVE-2006-6053

References

• http://www.redhat.com/security/updates/classification/#important