RHSA-2008:0973 - Security Advisory

Topic

Updated kernel packages that resolve several security issues and fix
various bugs are now available for Red Hat Enterprise Linux 3.

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

Description

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update addresses the following security issues:

• Tavis Ormandy discovered a deficiency in the Linux kernel 32-bit and

64-bit emulation. This could allow a local, unprivileged user to prepare
and run a specially-crafted binary which would use this deficiency to leak
uninitialized and potentially sensitive data. (CVE-2008-0598, Important)

• a possible kernel memory leak was found in the Linux kernel Simple

Internet Transition (SIT) INET6 implementation. This could allow a local,
unprivileged user to cause a denial of service. (CVE-2008-2136, Important)

• missing capability checks were found in the SBNI WAN driver which could

allow a local user to bypass intended capability restrictions.
(CVE-2008-3525, Important)

• the do_truncate() and generic_file_splice_write() functions did not clear

the setuid and setgid bits. This could allow a local, unprivileged user to
obtain access to privileged information. (CVE-2008-4210, Important)

• a buffer overflow flaw was found in Integrated Services Digital Network

(ISDN) subsystem. A local, unprivileged user could use this flaw to cause a
denial of service. (CVE-2007-6063, Moderate)

• multiple NULL pointer dereferences were found in various Linux kernel

network drivers. These drivers were missing checks for terminal validity,
which could allow privilege escalation. (CVE-2008-2812, Moderate)

• a deficiency was found in the Linux kernel virtual filesystem (VFS)

implementation. This could allow a local, unprivileged user to attempt file
creation within deleted directories, possibly causing a denial of service.
(CVE-2008-3275, Moderate)

This update also fixes the following bugs:

• the incorrect kunmap function was used in nfs_xdr_readlinkres. kunmap()

was used where kunmap_atomic() should have been. As a consequence, if an
NFSv2 or NFSv3 server exported a volume containing a symlink which included
a path equal to or longer than the local system's PATH_MAX, accessing the
link caused a kernel oops. This has been corrected in this update.

• mptctl_gettargetinfo did not check if pIoc3 was NULL before using it as a

pointer. This caused a kernel panic in mptctl_gettargetinfo in some
circumstances. A check has been added which prevents this.

• lost tick compensation code in the timer interrupt routine triggered

without apparent cause. When running as a fully-virtualized client, this
spurious triggering caused the 64-bit version of Red Hat Enterprise Linux 3
to present highly inaccurate times. With this update the lost tick
compensation code is turned off when the operating system is running as a
fully-virtualized client under Xen or VMWare®.

All Red Hat Enterprise Linux 3 users should install this updated kernel
which addresses these vulnerabilities and fixes these bugs.

Solution

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

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 3 x86_64
• Red Hat Enterprise Linux Server 3 ia64
• Red Hat Enterprise Linux Server 3 i386
• Red Hat Enterprise Linux Workstation 3 x86_64
• Red Hat Enterprise Linux Workstation 3 ia64
• Red Hat Enterprise Linux Workstation 3 i386
• Red Hat Enterprise Linux Desktop 3 x86_64
• Red Hat Enterprise Linux Desktop 3 i386
• Red Hat Enterprise Linux for IBM z Systems 3 s390x
• Red Hat Enterprise Linux for IBM z Systems 3 s390
• Red Hat Enterprise Linux for Power, big endian 3 ppc

Fixes

• BZ - 392101 - CVE-2007-6063 Linux Kernel isdn_net_setcfg buffer overflow
• BZ - 433938 - CVE-2008-0598 kernel: linux x86_64 ia32 emulation leaks uninitialized data
• BZ - 438758 - wrong kunmap call in nfs_xdr_readlinkres
• BZ - 446031 - CVE-2008-2136 kernel: sit memory leak
• BZ - 453419 - CVE-2008-2812 kernel: NULL ptr dereference in multiple network drivers due to missing checks in tty code
• BZ - 457858 - CVE-2008-3275 Linux kernel local filesystem DoS
• BZ - 460401 - CVE-2008-3525 kernel: missing capability checks in sbni_ioctl()
• BZ - 463661 - CVE-2008-4210 kernel: open() call allows setgid bit when user is not in new file's group

CVEs

• CVE-2007-6063
• CVE-2008-0598
• CVE-2008-2136
• CVE-2008-2812
• CVE-2008-3275
• CVE-2008-4210
• CVE-2008-3525

References

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