June 14, 2021

New Kernels for Ubuntu 10.04 LTS Fix Security Vulnerabilities

(LiveHacking.Com) – Unlike many Linux distributions, which are superseded almost daily, stable distributions from RedHat, CentOS and the Ubuntu LTS (Long Term Support) variants offer stability and a longer supported lifetime.

Ubuntu has just issued two new kernels for Ubuntu 10.04 LTS. The 10.04 release, which is available for both the server and the desktop, was released in April 2010 and will be supported until April 2013 (for the desktop) and until April 2015 for the server version.

The first new kernel is 2.6.32-35 a release of the default 2.6.32  kernel that used when Ubuntu 10.04 LTS was first released. The kernel has a number of security related fixes including:

  • The kernel incorrectly handled certain VLAN packets. On some systems, a remote attacker could send specially crafted traffic to crash the system, leading to a denial of service. (CVE-2011-1576)
  • Ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service. (CVE-2011-1833)
  • Taskstats did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2494)
  • /proc/PID/io did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2495)
  • The Bluetooth stack incorrectly handled certain L2CAP requests. If a system was using Bluetooth, a remote attacker could send specially crafted traffic to crash the system or gain root privileges. (CVE-2011-2497)
  • The EXT4 filesystem contained multiple off-by-one flaws. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2695)
  • The IPv6 stack used predictable fragment identification numbers. A remote attacker could exploit this to exhaust network resources, leading to a denial of service. (CVE-2011-2699)
  • The perf command looks for configuration files in the current directory. If a privileged user were tricked into running perf in a directory containing a malicious configuration file, an
  • attacker could run arbitrary commands and possibly gain privileges. (CVE-2011-2905)
  • Long symlinks were incorrectly handled on Be filesystems. A local attacker could exploit this with a malformed Be filesystem and crash the system, leading to a denial of service. (CVE-2011-2928)
  • The kernel incorrectly handled random sequence number generation. An attacker could use this flaw to possibly predict sequence numbers and inject packets. (CVE-2011-3188)
  • The CIFS client incorrectly handled certain large values. A remote attacker with a malicious server could exploit this to crash the system or possibly execute arbitrary code as the root user. (CVE-2011-3191)
The other new kernel, 2.6.38-12, is backport of kernel 2.6.38 from Ubuntu 11.04 to the standard repository. This kernel also contains a number of security updates.

Exploit OOPS: Root Privileges on Linux

Security researcher Dan Rosenberg presents a small demo program which combines several security holes to obtaiLive Hacking Linux CDn root privileges on Linux systems on Full Disclosure Security mailing list.

He combined some existing vulnerabilities with the vulnerability discovered by Nelson Elhage in connection with the kernel’s thread management and troubleshooting routines (CVE-2010-4258).With this exploit, an attacker can potentially exploit an OOPS to write a null byte into the kernel’s memory area. [Read more…]

Canonical and others close kernel holes

Canonical has released updated kernels for Ubuntu versions 10.04 LTS, 9.10, 9.04, 8.04 LTS and 6.06 LTS to close the recently discovered holes in the Linux kernel. The updates are also for the equivalent versions of Kubuntu, Edubuntu and Xubuntu and should be available through Ubuntu’s Software Update system.

Read the full article here.