Functional code that demonstrates an exploit of the Mozilla Firefox, Thunderbird, and SeaMonkey CRMF requests remote code execution vulnerability is publicly available.
A vulnerability in Mozilla Firefox, Thunderbird, and SeaMonkey could allow an unauthenticated, remote attacker to execute arbitrary code or conduct cross-site scripting (XSS) attacks.
The vulnerability is due to an unspecified error in the affected software while creating certain Certificate Request Message Format (CRMF) requests. An attacker could exploit this vulnerability by convincing a user to visit a malicious web page. When the user visits the page, the attacker could execute arbitrary code or conduct XSS attacks on the system.
Functional code that exploits this vulnerability is available as part of the Metasploit framework.
Mozilla has confirmed the vulnerability and released updated software.
The following Mozilla products are affected:
Firefox versions prior to 23.0
Firefox ESR versions prior to 17.0.8
Thunderbird versions prior to 17.0.8
Thunderbird ESR versions prior to 17.0.8
SeaMonkey versions prior to 2.20
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link.
The vulnerability is not likely to be exploited through email in Thunderbird and SeaMonkey because the products have scripting disabled; however, the vulnerability could be a risk in the browser or browser-like contexts of the products.
Mozilla has released a security advisory at the following link: MFSA 2013-69
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on the system with the privileges of the user. The attacker could also exploit this vulnerability to conduct XSS attacks on the system, which may allow the attacker to obtain sensitive information such as authentication cookies or recently submitted data.
The vulnerability is due an unspecified error in crypto.generateCRMFRequest() function of the affected software while generating a CRMF request under certain conditions.
Additional technical information is not available.
Administrators are advised to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.
Version 2, August 12, 2013, 7:57 AM: FreeBSD has released a VuXML document and updated ports collection to address the Mozilla Firefox, Thunderbird, and SeaMonkey CRMF requests remote code execution vulnerability.
Version 1, August 8, 2013, 2:35 PM: Mozilla Firefox, Thunderbird, and SeaMonkey contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code or conduct cross-site scripting attacks on a targeted system. Updates are available.
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