[USN-1268-1] Linux kernel vulnerabilities

2011-11-27T00:00:00
ID SECURITYVULNS:DOC:27375
Type securityvulns
Reporter Securityvulns
Modified 2011-11-27T00:00:00

Description

========================================================================== Ubuntu Security Notice USN-1268-1 November 21, 2011

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 8.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description: - linux: Linux kernel

Details:

It was discovered that CIFS incorrectly handled authentication. When a user had a CIFS share mounted that required authentication, a local user could mount the same share without knowing the correct password. (CVE-2011-1585)

It was discovered that the GRE protocol incorrectly handled netns initialization. A remote attacker could send a packet while the ip_gre module was loading, and crash the system, leading to a denial of service. (CVE-2011-1767)

It was discovered that the IP/IP protocol incorrectly handled netns initialization. A remote attacker could send a packet while the ipip module was loading, and crash the system, leading to a denial of service. (CVE-2011-1768)

Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly handled unlock requests. A local attacker could exploit this to cause a denial of service. (CVE-2011-2491)

Robert Swiecki discovered that mapping extensions were incorrectly handled. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2496)

Ben Pfaff discovered that Classless Queuing Disciplines (qdiscs) were being incorrectly handled. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2525)

Yasuaki Ishimatsu discovered a flaw in the kernel's clock implementation. A local unprivileged attacker could exploit this causing a denial of service. (CVE-2011-3209)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 8.04 LTS: linux-image-2.6.24-30-386 2.6.24-30.96 linux-image-2.6.24-30-generic 2.6.24-30.96 linux-image-2.6.24-30-hppa32 2.6.24-30.96 linux-image-2.6.24-30-hppa64 2.6.24-30.96 linux-image-2.6.24-30-itanium 2.6.24-30.96 linux-image-2.6.24-30-lpia 2.6.24-30.96 linux-image-2.6.24-30-lpiacompat 2.6.24-30.96 linux-image-2.6.24-30-mckinley 2.6.24-30.96 linux-image-2.6.24-30-openvz 2.6.24-30.96 linux-image-2.6.24-30-powerpc 2.6.24-30.96 linux-image-2.6.24-30-powerpc-smp 2.6.24-30.96 linux-image-2.6.24-30-powerpc64-smp 2.6.24-30.96 linux-image-2.6.24-30-rt 2.6.24-30.96 linux-image-2.6.24-30-server 2.6.24-30.96 linux-image-2.6.24-30-sparc64 2.6.24-30.96 linux-image-2.6.24-30-sparc64-smp 2.6.24-30.96 linux-image-2.6.24-30-virtual 2.6.24-30.96 linux-image-2.6.24-30-xen 2.6.24-30.96

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

References: http://www.ubuntu.com/usn/usn-1268-1 CVE-2011-1585, CVE-2011-1767, CVE-2011-1768, CVE-2011-2491, CVE-2011-2496, CVE-2011-2525, CVE-2011-3209

Package Information: https://launchpad.net/ubuntu/+source/linux/2.6.24-30.96