Ubuntu: 1589-2: GNU C Library regression
Posted by Benjamin D. Thomas   
Ubuntu USN-1589-1 exposed a regression in the GNU C Library floating point parser.
==========================================================================
Ubuntu Security Notice USN-1589-2
December 17, 2012

glibc regression
==========================================================================

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

- Ubuntu 8.04 LTS

Summary:

USN-1589-1 exposed a regression in the GNU C Library floating point parser.

Software Description:
- glibc: GNU C Library

Details:

USN-1589-1 fixed vulnerabilities in the GNU C Library. One of the updates
exposed a regression in the floating point parser. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that positional arguments to the printf() family
 of functions were not handled properly in the GNU C Library. An
 attacker could possibly use this to cause a stack-based buffer
 overflow, creating a denial of service or possibly execute arbitrary
 code. (CVE-2012-3404, CVE-2012-3405, CVE-2012-3406)
  It was discovered that multiple integer overflows existed in the
 strtod(), strtof() and strtold() functions in the GNU C Library. An
 attacker could possibly use this to trigger a stack-based buffer
 overflow, creating a denial of service or possibly execute arbitrary
 code. (CVE-2012-3480)

Update instructions:

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

Ubuntu 8.04 LTS:
  libc6                           2.7-10ubuntu8.3

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

References:
  http://www.ubuntu.com/usn/usn-1589-2
  http://www.ubuntu.com/usn/usn-1589-1
  CVE-2012-3480

Package Information:
  https://launchpad.net/ubuntu/+source/glibc/2.7-10ubuntu8.3