Security issues were identified and fixed in mozilla firefox and thunderbird :

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative two instances of code which modifies SVG element lists failed to account for changes made to the list by user-supplied callbacks before accessing list elements. If a user-supplied callback deleted such an object, the element-modifying code could wind up accessing deleted memory and potentially executing attacker-controlled memory. regenrecht also reported via TippingPoint's Zero Day Initiative that a XUL document could force the nsXULCommandDispatcher to remove all command updaters from the queue, including the one currently in use. This could result in the execution of deleted memory which an attacker could use to run arbitrary code on a victim's computer (CVE-2011-0083, CVE-2011-0085, CVE-2011-2363).

Mozilla security researcher David Chan reported that cookies set for example.com. (note the trailing dot) and example.com were treated as interchangeable. This is a violation of same-origin conventions and could potentially lead to leakage of cookie data to the wrong party (CVE-2011-2362).

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products.
Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code (CVE-2011-2364, CVE-2011-2365, CVE-2011-2374, CVE-2011-2375, CVE-2011-2376).

Security researchers Chris Rohlf and Yan Ivnitskiy of Matasano Security reported that when a JavaScript Array object had its length set to an extremely large value, the iteration of array elements that occurs when its reduceRight method was subsequently called could result in the execution of attacker controlled memory due to an invalid index value being used to access element properties (CVE-2011-2371).

Security researcher Martin Barbella reported that under certain conditions, viewing a XUL document while JavaScript was disabled caused deleted memory to be accessed. This flaw could potentially be used by an attacker to crash a victim's browser and run arbitrary code on their computer (CVE-2011-2373).

Security researcher Jordi Chancel reported a crash on multipart/x-mixed-replace images due to memory corruption (CVE-2011-2377).

Packages for 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149 products_id=490

Additionally, some packages which require so, have been rebuilt and are being provided as updates.

Detections

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Mandriva Linux Security Advisory : mozilla (MDVSA-2011:111)

critical Nessus Plugin ID 55406

No changelogs found