USN-2519-1: GNU C Library vulnerabilities

Releases

• Ubuntu 14.10
• Ubuntu 14.04 ESM
• Ubuntu 12.04
• Ubuntu 10.04

Packages

• eglibc - GNU C Library
• glibc - GNU C Library

Details

Arnaud Le Blanc discovered that the GNU C Library incorrectly handled file
descriptors when resolving DNS queries under high load. This may cause a
denial of service in other applications, or an information leak. This issue
only affected Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 14.04 LTS.
(CVE-2013-7423)

It was discovered that the GNU C Library incorrectly handled receiving a
positive answer while processing the network name when performing DNS
resolution. A remote attacker could use this issue to cause the GNU C
Library to hang, resulting in a denial of service. (CVE-2014-9402)

Joseph Myers discovered that the GNU C Library wscanf function incorrectly
handled memory. A remote attacker could possibly use this issue to cause
the GNU C Library to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only affected Ubuntu 12.04 LTS, Ubuntu
14.04 LTS and Ubuntu 14.10. (CVE-2015-1472, CVE-2015-1473)

Update instructions

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

Ubuntu 14.10

• libc6 - 2.19-10ubuntu2.3

Ubuntu 14.04

• libc6 - 2.19-0ubuntu6.6

Ubuntu 12.04

• libc6 - 2.15-0ubuntu10.11

Ubuntu 10.04

• libc6 - 2.11.1-0ubuntu7.21

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

References

• CVE-2013-7423
• CVE-2014-9402
• CVE-2015-1472
• CVE-2015-1473