USN-3068-1: Libidn vulnerabilities

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• libidn - implementation of IETF IDN specifications

Details

Thijs Alkemade, Gustavo Grieco, Daniel Stenberg, and Nikos
Mavrogiannopoulos discovered that Libidn incorrectly handled invalid UTF-8
characters. A remote attacker could use this issue to cause Libidn to
crash, resulting in a denial of service, or possibly disclose sensitive
memory. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS.
(CVE-2015-2059)

Hanno Böck discovered that Libidn incorrectly handled certain input. A
remote attacker could possibly use this issue to cause Libidn to crash,
resulting in a denial of service. (CVE-2015-8948, CVE-2016-6262,
CVE-2016-6261, CVE-2016-6263)

Update instructions

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

Ubuntu 16.04

• libidn11 - 1.32-3ubuntu1.1

Ubuntu 14.04

• libidn11 - 1.28-1ubuntu2.1

Ubuntu 12.04

• libidn11 - 1.23-2ubuntu0.1

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

References

• CVE-2015-2059
• CVE-2015-8948
• CVE-2016-6261
• CVE-2016-6262
• CVE-2016-6263