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Ubuntu Security Notice USN-1157-2
June 22, 2011

mozvoikko, ubufox, webfav update
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04

Summary:

This update provides provides packages compatible with Firefox 5.

Software Description:
- mozvoikko: Finnish spell-checker extension for Firefox
- ubufox: Ubuntu Firefox specific configuration defaults and apt support
- webfav: Firefox extension for saving web favorites (bookmarks)

Details:

USN-1157-1 fixed vulnerabilities in Firefox. This update provides updated
packages for use with Firefox 5.

Original advisory details:

 Bob Clary, Kevin Brosnan, Gary Kwong, Jesse Ruderman, Christian Biesinger,
 Bas Schouten, Igor Bukanov, Bill McCloskey, Olli Pettay, Daniel Veditz and
 Marcia Knous discovered multiple memory vulnerabilities in the browser
 rendering engine. An attacker could possibly execute arbitrary code with
 the privileges of the user invoking Firefox. (CVE-2011-2374, CVE-2011-2375)
 
 Martin Barbella discovered that under certain conditions, viewing a XUL
 document while JavaScript was disabled caused deleted memory to be
 accessed. An attacker could potentially use this to crash Firefox or
 execute arbitrary code with the privileges of the user invoking Firefox.
 (CVE-2011-2373)
 
 Jordi Chancel discovered a vulnerability on multipart/x-mixed-replace
 images due to memory corruption. An attacker could potentially use this to
 crash Firefox or execute arbitrary code with the privileges of the user
 invoking Firefox. (CVE-2011-2377)
 
 Chris Rohlf and Yan Ivnitskiy discovered an integer overflow vulnerability
 in JavaScript Arrays. An attacker could potentially use this to execute
 arbitrary code with the privileges of the user invoking Firefox.
 (CVE-2011-2371)
 
 It was discovered that Firefox's WebGL textures did not honor same-origin
 policy. If a user were tricked into viewing a malicious site, an attacker
 could potentially view image data from a different site. (CVE-2011-2366)
 
 Christoph Diehl discovered an out-of-bounds read vulnerability in WebGL
 code. An attacker could potentially read data that other processes had
 stored in the GPU. (CVE-2011-2367)
 
 Christoph Diehl discovered an invalid write vulnerability in WebGL code. An
 attacker could potentially use this to execute arbitrary code with the
 privileges of the user invoking Firefox. (CVE-2011-2368)
 
 It was discovered that an unauthorized site could trigger an installation
 dialog for addons and themes. If a user were tricked into viewing a
 malicious site, an attacker could possibly trick the user into installing a
 malicious addon or theme. (CVE-2011-2370)
 
 Mario Heiderich discovered a vulnerability in displaying decoded
 HTML-encoded entities inside SVG elements. An attacker could utilize this
 to perform cross-site scripting attacks. (CVE-2011-2369)

Update instructions:

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

Ubuntu 11.04:
  xul-ext-mozvoikko               1.9.0~svn20101114r3591-0ubuntu3.11.04.1
  xul-ext-ubufox                  0.9.1-0ubuntu0.11.04.1
  xul-ext-webfav                  1.17-0ubuntu5.1

After a standard system update you need to restart Firefox to make
all the necessary changes.

References:
  https://launchpad.net/bugs/798484

Package Information:
  https://launchpad.net/ubuntu/+source/mozvoikko/1.9.0~svn20101114r3591-0ubuntu3.11.04.1
  https://launchpad.net/ubuntu/+source/ubufox/0.9.1-0ubuntu0.11.04.1
  https://launchpad.net/ubuntu/+source/webfav/1.17-0ubuntu5.1