A large number of security issues were discovered in the Gecko rendering engine. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Mozilla XULRunner 1.9.1 was updated to the 1.9.1.19 security release.

  - 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. Credits. (MFSA 2011-12)

    Mozilla developer Scoobidiver reported a memory safety     issue which affected Firefox 4 and Firefox 3.6.
    (CVE-2011-0081)

    The web development team of Alcidion reported a crash     that affected Firefox 4, Firefox 3.6 and Firefox 3.5.
    (CVE-2011-0069)

    Ian Beer reported a crash that affected Firefox 4,     Firefox 3.6 and Firefox 3.5. (CVE-2011-0070)

    Mozilla developers Bob Clary, Henri Sivonen, Marco     Bonardo, Mats Palmgren and Jesse Ruderman reported     memory safety issues which affected Firefox 3.6 and     Firefox 3.5. (CVE-2011-0080)

    Aki Helin reported memory safety issues which affected     Firefox 3.6 and Firefox 3.5. (CVE-2011-0074 /     CVE-2011-0075)

    Ian Beer reported memory safety issues which affected     Firefox 3.6 and Firefox 3.5. (CVE-2011-0077 /     CVE-2011-0078)

    Martin Barbella reported a memory safety issue which     affected Firefox 3.6 and Firefox 3.5. (CVE-2011-0072)

  - Security researcher regenrecht reported several dangling     pointer vulnerabilities via TippingPoint's Zero Day     Initiative. (MFSA 2011-13 / CVE-2011-0065 /     CVE-2011-0066 / CVE-2011-0073)

  - Security researcher Paul Stone reported that a Java     applet could be used to mimic interaction with form     autocomplete controls and steal entries from the form     history. (MFSA 2011-14 / CVE-2011-0067)

  - Chris Evans of the Chrome Security Team reported that     the XSLT generate-id() function returned a string that     revealed a specific valid address of an object on the     memory heap. It is possible that in some cases this     address would be valuable information that could be used     by an attacker while exploiting a different memory     corruption but, in order to make an exploit more     reliable or work around mitigation features in the     browser or operating system. (MFSA 2011-18 /     CVE-2011-1202)

Mozilla Firefox was updated to the 3.6.17 security release.

MFSA 2011-12: 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. Credits

Mozilla developer Scoobidiver reported a memory safety issue which affected Firefox 4 and Firefox 3.6 (CVE-2011-0081)

The web development team of Alcidion reported a crash that affected Firefox 4, Firefox 3.6 and Firefox 3.5. (CVE-2011-0069)

Ian Beer reported a crash that affected Firefox 4, Firefox 3.6 and Firefox 3.5. (CVE-2011-0070)

Mozilla developers Bob Clary, Henri Sivonen, Marco Bonardo, Mats Palmgren and Jesse Ruderman reported memory safety issues which affected Firefox 3.6 and Firefox 3.5. (CVE-2011-0080)

Aki Helin reported memory safety issues which affected Firefox 3.6 and Firefox 3.5. (CVE-2011-0074 , CVE-2011-0075)

Ian Beer reported memory safety issues which affected Firefox 3.6 and Firefox 3.5. (CVE-2011-0077 , CVE-2011-0078)

Martin Barbella reported a memory safety issue which affected Firefox 3.6 and Firefox 3.5. (CVE-2011-0072)

MFSA 2011-13 / CVE-2011-0065 / CVE-2011-0066 / CVE-2011-0073: Security researcher regenrecht reported several dangling pointer vulnerabilities via TippingPoint's Zero Day Initiative.

MFSA 2011-14 / CVE-2011-0067: Security researcher Paul Stone reported that a Java applet could be used to mimic interaction with form autocomplete controls and steal entries from the form history.

MFSA 2011-15 / CVE-2011-0076: David Remahl of Apple Product Security reported that the Java Embedding Plugin (JEP) shipped with the Mac OS X versions of Firefox could be exploited to obtain elevated access to resources on a user's system.

MFSA 2011-16 / CVE-2011-0071: Security researcher Soroush Dalili reported that the resource: protocol could be exploited to allow directory traversal on Windows and the potential loading of resources from non-permitted locations. The impact would depend on whether interesting files existed in predictable locations in a useful format.
For example, the existence or non-existence of particular images might indicate whether certain software was installed. 

MFSA 2011-18 / CVE-2011-1202: Chris Evans of the Chrome Security Team reported that the XSLT generate-id() function returned a string that revealed a specific valid address of an object on the memory heap. It is possible that in some cases this address would be valuable information that could be used by an attacker while exploiting a different memory corruption but, in order to make an exploit more reliable or work around mitigation features in the browser or operating system.

ID	Name	Product	Family	Published	Updated	Severity
55083	Ubuntu 9.10 : Multiple Xulrunner 1.9.1 vulnerabilities (USN-1123-1)	Nessus	Ubuntu Local Security Checks	6/13/2011	9/19/2019	critical
57228	SuSE 10 Security Update : Mozilla XULrunner (ZYPP Patch Number 7492)	Nessus	SuSE Local Security Checks	12/13/2011	1/19/2021	critical
75652	openSUSE Security Update : MozillaFirefox (MozillaFirefox-4459)	Nessus	SuSE Local Security Checks	6/13/2014	1/14/2021	critical

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