USN-2294-1: Libtasn1 vulnerabilities

Ubuntu Security Notice USN-2294-1

22nd July, 2014

libtasn1-3, libtasn1-6 vulnerabilities

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

  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

Libtasn1 could be made to crash or run programs as your login if it processed specially crafted data.

Software description

  • libtasn1-3 - Library to manage ASN.1 structures
  • libtasn1-6 - Library to manage ASN.1 structures

Details

It was discovered that Libtasn1 incorrectly handled certain ASN.1 data
structures. An attacker could exploit this with specially crafted ASN.1
data and cause applications using Libtasn1 to crash, resulting in a denial
of service. (CVE-2014-3467)

It was discovered that Libtasn1 incorrectly handled negative bit lengths.
An attacker could exploit this with specially crafted ASN.1 data and cause
applications using Libtasn1 to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2014-3468)

It was discovered that Libtasn1 incorrectly handled certain ASN.1 data. An
attacker could exploit this with specially crafted ASN.1 data and cause
applications using Libtasn1 to crash, resulting in a denial of service.
(CVE-2014-3469)

Update instructions

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

Ubuntu 14.04 LTS:
libtasn1-6 3.4-3ubuntu0.1
Ubuntu 12.04 LTS:
libtasn1-3 2.10-1ubuntu1.2
Ubuntu 10.04 LTS:
libtasn1-3 2.4-1ubuntu0.2

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-2014-3467, CVE-2014-3468, CVE-2014-3469