USN-967-1: w3m vulnerability

9 August 2010

w3m vulnerability

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

  • Ubuntu 10.04 LTS
  • Ubuntu 9.10
  • Ubuntu 9.04
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS


The web browser w3m does not properly validate SSL/TLS certificates.

Software Description

  • w3m - WWW browsable pager with excellent tables/frames support w3m-img


Ludwig Nussel discovered w3m does not properly handle SSL/TLS certificates with NULL characters in the certificate name. An attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications. (CVE-2010-2074)

Update instructions

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

Ubuntu 10.04 LTS
w3m - 0.5.2-2.1ubuntu1.1
Ubuntu 9.10
w3m - 0.5.2-2ubuntu1.1
Ubuntu 9.04
w3m - 0.5.2-2ubuntu0.1
Ubuntu 8.04 LTS
w3m - 0.5.1-5.1ubuntu1.1
Ubuntu 6.06 LTS
w3m - 0.5.1-4ubuntu2.6.06.1

To update your system, please follow these instructions:

After a standard system update you need to restart any running instances of w3m to effect the necessary changes.