Articles / Debian: Security update for…

Debian: Security update for Linux kernel

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. Andrea Righi reported an issue in KSM, a memory-saving de-duplication feature. By exploiting a race with exiting tasks, local users can cause a kernel oops, resulting in a denial of service. Dan Rosenberg discovered an issue in the INET socket monitoring interface. Local users could cause a denial of service by injecting code and causing the kernel to execute an infinite loop. Eric Dumazet reported an information leak in the raw packet socket implementation.

Han-Wen Nienhuys reported a local denial of service issue issue in the FUSE (Filesystem in Userspace) support in the linux kernel. Local users could cause a buffer overflow, leading to a kernel oops and resulting in a denial of service. Carlos Maiolino reported an issue in the XFS filesystem. A local user with the ability to mount a filesystem could corrupt memory resulting in a denial of service or possibly gain elevated privileges. David Howells reported an issue in the kernel’s access key retention system which allow local users to cause a kernel oops leading to a denial of service.

Paolo Bonzini of Red Hat reported an issue in the ioctl passthrough support for SCSI devices. Users with permission to access restricted portions of a device (e.g. a partition or a logical volume) can obtain access to the entire device by way of the SG_IO ioctl. This could be exploited by a local user or privileged VM guest to achieve a privilege escalation. Maynard Johnson reported an issue with the perf support on POWER7 systems that allows local users to cause a denial of service. Jan Kiszka reported an issue in the KVM PIT timer support. Local users with the permission to use KVM can cause a denial of service by starting a PIT timer without first setting up the irqchip.

Ben Hutchings reported various bounds checking issues within the ROSE protocol support in the kernel. Remote users could possibly use this to gain access to sensitive memory or cause a denial of service.

Updated packages are available from security.debian.org.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ----------------------------------------------------------------------
Debian Security Advisory DSA-2389-1                security@debian.org
http://www.debian.org/security/                           Dann Frazier
January 15, 2012                    http://www.debian.org/security/faq
- ----------------------------------------------------------------------

Package        : linux-2.6
Vulnerability  : privilege escalation/denial of service/information leak
Problem type   : local/remote
Debian-specific: no
CVE Id(s)      : CVE-2011-2183 CVE-2011-2213 CVE-2011-2898 CVE-2011-3353
                CVE-2011-4077 CVE-2011-4110 CVE-2011-4127 CVE-2011-4611
                CVE-2011-4622 CVE-2011-4914

Several vulnerabilities have been discovered in the Linux kernel that may lead
to a denial of service or privilege escalation. The Common Vulnerabilities and
Exposures project identifies the following problems:

CVE-2011-2183

   Andrea Righi reported an issue in KSM, a memory-saving de-duplication
   feature. By exploiting a race with exiting tasks, local users can cause
   a kernel oops, resulting in a denial of service.

CVE-2011-2213

   Dan Rosenberg discovered an issue in the INET socket monitoring interface.
   Local users could cause a denial of service by injecting code and causing
   the kernel to execute an infinite loop.

CVE-2011-2898

   Eric Dumazet reported an information leak in the raw packet socket
   implementation.

CVE-2011-3353

   Han-Wen Nienhuys reported a local denial of service issue issue in the FUSE
   (Filesystem in Userspace) support in the linux kernel. Local users could
   cause a buffer overflow, leading to a kernel oops and resulting in a denial
   of service.

CVE-2011-4077

   Carlos Maiolino reported an issue in the XFS filesystem. A local user
   with the ability to mount a filesystem could corrupt memory resulting
   in a denial of service or possibly gain elevated privileges.

CVE-2011-4110

   David Howells reported an issue in the kernel's access key retention
   system which allow local users to cause a kernel oops leading to a denial
   of service.

CVE-2011-4127

   Paolo Bonzini of Red Hat reported an issue in the ioctl passthrough
   support for SCSI devices. Users with permission to access restricted
   portions of a device (e.g. a partition or a logical volume) can obtain
   access to the entire device by way of the SG_IO ioctl. This could be
   exploited by a local user or privileged VM guest to achieve a privilege
   escalation.

CVE-2011-4611

   Maynard Johnson reported an issue with the perf support on POWER7 systems
   that allows local users to cause a denial of service.

CVE-2011-4622

   Jan Kiszka reported an issue in the KVM PIT timer support. Local users
   with the permission to use KVM can cause a denial of service by starting
   a PIT timer without first setting up the irqchip.

CVE-2011-4914

   Ben Hutchings reported various bounds checking issues within the ROSE
   protocol support in the kernel. Remote users could possibly use this
   to gain access to sensitive memory or cause a denial of service.

For the stable distribution (squeeze), this problem has been fixed in version
2.6.32-39squeeze1. Updates for issues impacting the oldstable distribution
(lenny) will be available soon.

The following matrix lists additional source packages that were rebuilt for
compatibility with or to take advantage of this update:

                                            Debian 6.0 (squeeze)
    user-mode-linux                         2.6.32-1um-4+39squeeze1

We recommend that you upgrade your linux-2.6 and user-mode-linux packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
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=rgcP
-----END PGP SIGNATURE-----
Screenshot

Project Spotlight

Kigo Video Converter Ultimate for Mac

A tool for converting and editing videos.

Screenshot

Project Spotlight

Kid3

An efficient tagger for MP3, Ogg/Vorbis, and FLAC files.