USN-2982-1: Libksba vulnerabilities

Ubuntu Security Notice USN-2982-1

17th May, 2016

libksba vulnerabilities

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

  • Ubuntu 16.04 LTS
  • Ubuntu 15.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Libksba could be made to crash or run programs if it decoded specially crafted data.

Software description

  • libksba - X.509 and CMS support library

Details

Hanno Böck discovered that Libksba incorrectly handled decoding certain BER
data. An attacker could use this issue to cause Libksba to crash, resulting
in a denial of service. This issue only applied to Ubunt 12.04 LTS and
Ubuntu 14.04 LTS. (CVE-2016-4353)

Hanno Böck discovered that Libksba incorrectly handled decoding certain BER
data. An attacker could use this issue to cause Libksba to crash, resulting
in a denial of service, or possibly execute arbitrary code. This issue only
applied to Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4354,
CVE-2016-4355)

Hanno Böck discovered that Libksba incorrectly handled incorrect utf-8
strings when decoding certain DN data. An attacker could use this issue to
cause Libksba to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only applied to Ubunt 12.04 LTS and
Ubuntu 14.04 LTS. (CVE-2016-4356)

Pascal Cuoq discovered that Libksba incorrectly handled incorrect utf-8
strings when decoding certain DN data. An attacker could use this issue to
cause Libksba to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2016-4574)

Pascal Cuoq discovered that Libksba incorrectly handled decoding certain
data. An attacker could use this issue to cause Libksba to crash, resulting
in a denial of service. (CVE-2016-4579)

Update instructions

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

Ubuntu 16.04 LTS:
libksba8 1.3.3-1ubuntu0.16.04.1
Ubuntu 15.10:
libksba8 1.3.3-1ubuntu0.15.10.1
Ubuntu 14.04 LTS:
libksba8 1.3.0-3ubuntu0.14.04.2
Ubuntu 12.04 LTS:
libksba8 1.2.0-2ubuntu0.2

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-2016-4353, CVE-2016-4354, CVE-2016-4355, CVE-2016-4356, CVE-2016-4574, CVE-2016-4579