Debian Security Advisory DSA 2443-1 (linux-2.6 - privilege escalation/denial of service)

Published: 2013-09-18 09:53:02
CVE Author: NIST National Vulnerability Database (NVD)

CVSS Base Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected Versions:
linux-2.6 on Debian Linux

Recommendations:
For the stable distribution (squeeze), this problem has been fixed in version 2.6.32-41squeeze2. The following matrix lists additional source Linux Distribution Packages that were rebuilt for compatibility with or to take advantage of this update:  Debian 6.0 (squeeze)user-mode-linux2.6.32-1um-4+41squeeze2We recommend that you upgrade your linux-2.6 and user-mode-linux Linux Distribution Packages. Thanks to Micah Anderson for proof reading this text.

Summary:
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-2009-4307Nageswara R Sastry reported an issue in the ext4 filesystem. Local users with the privileges to mount a filesystem can cause a denial of service (BUG) by providing a s_log_groups_per_flex value greater than 31. CVE-2011-1833Vasiliy Kulikov of Openwall and Dan Rosenberg discovered an information leak in the eCryptfs filesystem. Local users were able to mount arbitrary directories. CVE-2011-4347Sasha Levin reported an issue in the device assignment functionality in KVM. Local users with permission to access /dev/kvm could assign unused pci devices to a guest and cause a denial of service (crash). CVE-2012-0045Stephan Barwolf reported an issue in KVM. Local users in a 32-bit guest running on a 64-bit system can crash the guest with a syscall instruction. CVE-2012-1090CAI Qian reported an issue in the CIFS filesystem. A reference count leak can occur during the lookup of special files, resulting in a denial of service (oops) on umount. CVE-2012-1097H. Peter Anvin reported an issue in the regset infrastructure. Local users can cause a denial of service (NULL pointer dereference) by triggering the write methods of readonly regsets.

Detection Method:
This check tests the installed software version using the apt Linux Distribution Package manager.

Detection Type:
Linux Distribution Package

Solution Type:
Vendor Patch

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2012-1097
https://nvd.nist.gov/vuln/detail/CVE-2011-4347
https://nvd.nist.gov/vuln/detail/CVE-2009-4307
https://nvd.nist.gov/vuln/detail/CVE-2011-1833
https://nvd.nist.gov/vuln/detail/CVE-2012-1090
https://nvd.nist.gov/vuln/detail/CVE-2012-0045

References:

http://www.debian.org/security/2012/dsa-2443.html

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Severity
High
CVSS Score
7.2

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