USN-3491-1: ldns vulnerabilities

Ubuntu Security Notice USN-3491-1

22nd November, 2017

ldns vulnerabilities

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

Summary

Several security issues were fixed in ldns.

Software description

  • ldns - ldns library for DNS programming

Details

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.
(CVE-2014-3209)

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)

Update instructions

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

Ubuntu 17.10:
libldns2 1.7.0-1ubuntu1.17.10.1
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.

References

CVE-2014-3209, CVE-2017-1000231, CVE-2017-1000232