USN-944-1: GNU C Library vulnerabilities

Releases

• Ubuntu 10.04
• Ubuntu 9.10
• Ubuntu 9.04
• Ubuntu 8.04
• Ubuntu 6.06

Packages

• eglibc - Shared system libraries
• glibc - Shared system libraries

Details

Maksymilian Arciemowicz discovered that the GNU C library did not
correctly handle integer overflows in the strfmon function. If a user
or automated system were tricked into processing a specially crafted
format string, a remote attacker could crash applications, leading to
a denial of service. (Ubuntu 10.04 was not affected.) (CVE-2008-1391)

Jeff Layton and Dan Rosenberg discovered that the GNU C library did not
correctly handle newlines in the mntent family of functions. If a local
attacker were able to inject newlines into a mount entry through other
vulnerable mount helpers, they could disrupt the system or possibly gain
root privileges. (CVE-2010-0296)

Dan Rosenberg discovered that the GNU C library did not correctly validate
certain ELF program headers. If a user or automated system were tricked
into verifying a specially crafted ELF program, a remote attacker could
execute arbitrary code with user privileges. (CVE-2010-0830)

Update instructions

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

Ubuntu 9.10

• libc6 - 2.10.1-0ubuntu17

Ubuntu 9.04

• libc6 - 2.9-4ubuntu6.2

Ubuntu 8.04

• libc6 - 2.7-10ubuntu6

Ubuntu 6.06

• libc6 - 2.3.6-0ubuntu20.6

Ubuntu 10.04

• libc6 - 2.11.1-0ubuntu7.1

After a standard system update you need to restart all services to make
the necessary changes.

References

• CVE-2010-0296
• CVE-2010-0830
• CVE-2008-1391