Uočena su dva sigurnosna propusta u paketu kde4libs, skupu biblioteka za razvoj aplikacija za KDE (K Desktop Enviroment) okruženje. Prvi propust je otkriven u "kio/kio/tcpslavebase.cpp" gdje postoji nedovoljna provjera ulaznih vrijednosti vezanih uz X.509 certifikat. Rezultat je MiTM (eng. man-in-the-middle) napad i otkrivanje osjetljivih podataka. Drugi propust se javlja zbog nedovoljnih provjera u funkciji "KHTMLPart::htmlError()" u datoteci "khtml/khtml_part.cpp". Napadač ga može iskoristiti za izvođenje XSS (eng. Cross-site scripting) napada i otkrivanje osjetljivih podataka poput lozinki. Preporuča se korištenje nadogradnje.

==========================================================================
Ubuntu Security Notice USN-1110-1
April 14, 2011

kde4libs vulnerabilities
==========================================================================

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

- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 9.10

Summary:

An attacker could send crafted input to Konqueror to view sensitive
information.

Software Description:
- kde4libs: KDE 4 core applications

Details:

It was discovered that KDE KSSL did not properly verify X.509 certificates
when the certificate was issued for an IP address. An attacker could
exploit this to perform a man in the middle attack to view sensitive
information or alter encrypted communications. (CVE-2011-1094)

Tim Brown discovered that KDE KHTML did not properly escape URLs from
externally generated error pages. An attacker could expoit this to conduct
cross-site scripting attacks. With cross-site scripting vulnerabilities, if
a user were tricked into viewing server output during a crafted server
request, a remote attacker could exploit this to modify the contents, or
steal confidential data (such as passwords), within the same domain.
(CVE-2011-1168)

Update instructions:

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

Ubuntu 10.10:
  libkhtml5                       4:4.5.1-0ubuntu8.1
  libkio5                         4:4.5.1-0ubuntu8.1

Ubuntu 10.04 LTS:
  kdelibs5                        4:4.4.5-0ubuntu1.1

Ubuntu 9.10:
  kdelibs5                        4:4.3.2-0ubuntu7.3

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

References:
  CVE-2011-1094, CVE-2011-1168

Package Information:
  https://launchpad.net/ubuntu/+source/kde4libs/4:4.5.1-0ubuntu8.1
  https://launchpad.net/ubuntu/+source/kde4libs/4:4.4.5-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/kde4libs/4:4.3.2-0ubuntu7.3