USN-1336-1: Linux kernel vulnerability
Ubuntu Security Notice USN-1336-1
23rd January, 2012
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
The system could be made to run programs as an administrator.
- linux - Linux kernel
Clement Lecigne discovered a bug in the HFS filesystem. A local attacker
could exploit this to cause a kernel oops. (CVE-2011-2203)
A bug was discovered in the XFS filesystem's handling of pathnames. A local
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)
A flaw was found in how the Linux kernel handles user-defined key types. An
unprivileged local user could exploit this to crash the system.
A flaw was found in the Journaling Block Device (JBD). A local attacker
able to mount ext3 or ext4 file systems could exploit this to crash the
system, leading to a denial of service. (CVE-2011-4132)
Clement Lecigne discovered a bug in the HFS file system bounds checking.
When a malformed HFS file system is mounted a local user could crash the
system or gain root privileges. (CVE-2011-4330)
Chen Haogang discovered an integer overflow that could result in memory
corruption. A local unprivileged user could use this to crash the system.
Jüri Aedla discovered that the kernel incorrectly handled /proc/<pid>/mem
permissions. A local attacker could exploit this and gain root privileges.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- linux-image-3.0.0-15-omap 3.0.0-15.26
- linux-image-3.0.0-15-generic 3.0.0-15.26
- linux-image-3.0.0-15-powerpc-smp 3.0.0-15.26
- linux-image-3.0.0-15-server 3.0.0-15.26
- linux-image-3.0.0-15-generic-pae 3.0.0-15.26
- linux-image-3.0.0-15-powerpc64-smp 3.0.0-15.26
- linux-image-3.0.0-15-powerpc 3.0.0-15.26
- linux-image-3.0.0-15-virtual 3.0.0-15.26
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.