Ubuntu: 1612-1: libgssglue vulnerability
Posted by Benjamin D. Thomas   
Ubuntu Privilege escalation via the GSSAPI_MECH_CONF environment variable with setuidprograms.
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Ubuntu Security Notice USN-1612-1
October 15, 2012

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

Privilege escalation via the GSSAPI_MECH_CONF environment variable with setuid
programs.

Software Description:
- libgssglue: header files and docs for libgssglue

Details:

It was discovered that libgssglue incorrectly handled the GSSAPI_MECH_CONF
environment variable when running a privileged binary. A local attacker could
exploit this to gain root privileges. (CVE-2011-2709)

Update instructions:

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

Ubuntu 12.04 LTS:
  libgssglue1                     0.3-4ubuntu0.1

Ubuntu 11.10:
  libgssglue1                     0.3-1ubuntu1.1

Ubuntu 11.04:
  libgssglue1                     0.1-4ubuntu1.1

Ubuntu 10.04 LTS:
  libgssglue1                     0.1-4ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1612-1
  CVE-2011-2709

Package Information:
  https://launchpad.net/ubuntu/+source/libgssglue/0.3-4ubuntu0.1
  https://launchpad.net/ubuntu/+source/libgssglue/0.3-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgssglue/0.1-4ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgssglue/0.1-4ubuntu0.1