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[USN-1400-5] GSettings desktop schemas regression

Posted on 20 April 2012
Ubuntu Security

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Ubuntu Security Notice USN-1400-5
April 20, 2012

gsettings-desktop-schemas regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04

Summary:

Firefox's ability to use system proxy settings regressed.

Software Description:
- gsettings-desktop-schemas: GSettings desktop-wide schemas

Details:

USN-1400-1 fixed vulnerabilities in Firefox. Firefox 11 started using
GSettings to access the system proxy settings. If there is a GSettings
proxy settings schema, Firefox will consume it. The GSettings proxy
settings schema that was shipped by default was unused by other
applications and broke Firefox's ability to use system proxy settings. Th=
is
update removes the unused schema. We apologize for the inconvenience.

Original advisory details:

Soroush Dalili discovered that Firefox did not adequately protect agains=
t
dropping JavaScript links onto a frame. A remote attacker could, through=

cross-site scripting (XSS), exploit this to modify the contents or steal=

confidential data. (CVE-2012-0455)
=20
Atte Kettunen discovered a use-after-free vulnerability in Firefox's
handling of SVG animations. An attacker could potentially exploit this t=
o
execute arbitrary code with the privileges of the user invoking Firefox.=

(CVE-2012-0457)
=20
Atte Kettunen discovered an out of bounds read vulnerability in Firefox'=
s
handling of SVG Filters. An attacker could potentially exploit this to m=
ake
data from the user's memory accessible to the page content. (CVE-2012-04=
56)
=20
Mike Brooks discovered that using carriage return line feed (CRLF)
injection, one could introduce a new Content Security Policy (CSP) rule
which allows for cross-site scripting (XSS) on sites with a separate hea=
der
injection vulnerability. With cross-site scripting vulnerabilities, if a=

user were tricked into viewing a specially crafted page, a remote attack=
er
could exploit this to modify the contents, or steal confidential data,
within the same domain. (CVE-2012-0451)
=20
Mariusz Mlynski discovered that the Home button accepted JavaScript link=
s
to set the browser Home page. An attacker could use this vulnerability t=
o
get the script URL loaded in the privileged about:sessionrestore context=
=2E
(CVE-2012-0458)
=20
Daniel Glazman discovered that the Cascading Style Sheets (CSS)
implementation is vulnerable to crashing due to modification of a keyfra=
me
followed by access to the cssText of the keyframe. If the user were tric=
ked
into opening a specially crafted web page, an attacker could exploit thi=
s
to cause a denial of service via application crash, or potentially execu=
te
code with the privileges of the user invoking Firefox. (CVE-2012-0459)
=20
Matt Brubeck discovered that Firefox did not properly restrict access to=

the window.fullScreen object. If the user were tricked into opening a
specially crafted web page, an attacker could potentially use this
vulnerability to spoof the user interface. (CVE-2012-0460)
=20
Bob Clary, Christian Holler, Jesse Ruderman, Michael Bebenita, David
Anderson, Jeff Walden, Vincenzo Iozzo, and Willem Pinckaers discovered
memory safety issues affecting Firefox. If the user were tricked into
opening a specially crafted page, an attacker could exploit these to
cause a denial of service via application crash, or potentially execute
code with the privileges of the user invoking Firefox. (CVE-2012-0461,
CVE-2012-0462, CVE-2012-0464)

Update instructions:

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

Ubuntu 11.04:
gsettings-desktop-schemas 3.0.0-0ubuntu1.1

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

References:
http://www.ubuntu.com/usn/usn-1400-5
http://www.ubuntu.com/usn/usn-1400-1
https://launchpad.net/bugs/956961

Package Information:
https://launchpad.net/ubuntu/+source/gsettings-desktop-schemas/3.0.0-0u=
buntu1.1




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