USN-1248-1: KDE-Libs vulnerability

25 October 2011

kde4libs vulnerability

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

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS


KDE-Libs could improperly display fraudulent security certificates.

Software Description

  • kde4libs - KDE 4 core applications and libraries


Tim Brown discovered that KSSL in KDE-Libs did not properly perform input validation when displaying the common name (CN) for an SSL certificate. An attacker could exploit this to spoof the common name which could be used in an attack to trick the user into accepting a fraudulent certificate. This issue only affected Ubuntu 10.04 LTS and Ubuntu 10.10. (CVE-2011-3365)

It was discovered that KIO in KDE-Libs did not properly perform input validation during proxy authentication. An attacker could exploit this to modify displaying of the realm and proxy URL.

Update instructions

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

Ubuntu 11.04
libkio5 - 4:4.6.5-0ubuntu1.1
Ubuntu 10.10
libkio5 - 4:4.5.5-0ubuntu2.1
Ubuntu 10.04 LTS
kdelibs5 - 4:4.4.5-0ubuntu1.2

To update your system, please follow these instructions:

After a standard system update you need to restart any applications that use KSSL and KIO, such as Konqueror and Rekong, to make all the necessary changes.