USN-3491-1: ldns vulnerabilities
Ubuntu Security Notice USN-3491-1
22nd November, 2017
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Several security issues were fixed in ldns.
- ldns - ldns library for DNS programming
Leon Weber discovered that the ldns-keygen tool incorrectly set permissions
on private keys. A local attacker could possibly use this issue to obtain
generated private keys. This issue only applied to Ubuntu 14.04 LTS.
Stephan Zeisberg discovered that ldns incorrectly handled memory when
processing data. A remote attacker could use this issue to cause ldns to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2017-1000231, CVE-2017-1000232)
The problem can be corrected by updating your system to the following package version:
- Ubuntu 17.10:
- libldns2 1.7.0-1ubuntu18.104.22.168
- Ubuntu 17.04:
- libldns2 1.7.0-1ubuntu1.17.04.1
- Ubuntu 16.04 LTS:
- libldns1 1.6.17-8ubuntu0.1
- Ubuntu 14.04 LTS:
- libldns1 1.6.17-1ubuntu0.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.