USN-2900-1: GNU C Library vulnerability

Ubuntu Security Notice USN-2900-1

16th February, 2016

eglibc, glibc vulnerability

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

  • Ubuntu 15.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

GNU C Library could be made to crash or run programs if it received
specially crafted network traffic.

Software description

  • eglibc
    – GNU C Library

  • glibc
    – GNU C Library

Details

It was discovered that the GNU C Library incorrectly handled receiving
responses while performing DNS resolution. A remote attacker could use this
issue to cause the GNU C Library to crash, resulting in a denial of
service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 15.10:
libc6

2.21-0ubuntu4.1
Ubuntu 14.04 LTS:
libc6

2.19-0ubuntu6.7
Ubuntu 12.04 LTS:
libc6

2.15-0ubuntu10.13

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.

References

CVE-2015-7547

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