Mozilla Firefox, Thunderbird, and SeaMonkey contain a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks.
The vulnerability exists because the affected software fails to perform sufficient sanitization on user-supplied input. An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a malicious web page. Successful exploitation could allow the attacker to execute arbitrary script code in the user's browser session.
Mozilla has confirmed this vulnerability and released updated software.
Indicators of Compromise
The following Mozilla products are vulnerable:
Firefox versions prior to 11.0 and ESR 10.0.3
Thunderbird versions prior to 11.0 and ESR 10.0.3
SeaMonkey versions prior to 2.8
The vulnerability is due to insufficient sanitization performed on user-supplied input received through Content Security Policy (CSP) headers. The vulnerable code incorrectly parses the CRLF character sequences that are encountered while processing the CSP headers, resulting in an additive effect policy rule that makes the affected software vulnerable to further injection attacks.
An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a malicious web page. Successful exploitation could allow the attacker to execute arbitrary scripts in the user's browser session.
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.
Administrators are advised to apply the appropriate updates.
Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.
Administrators are advised to monitor affected systems.
Mozilla has released a security advisory at the following link: MFSA-2012-15
Red Hat packages can be updated using the up2date or yum command.
Oracle has released security advisories and patches to address the Mozilla Firefox, Thunderbird, and SeaMonkey CSP headers processing cross-site scripting vulnerability.
2012-June-29 12:53 GMT
FreeBSD has released a VuXML document and updated ports collection to address the Mozilla Firefox, Thunderbird, and SeaMonkey CSP headers processing cross-site scripting vulnerability. CentOS has also released updated packages to address this vulnerability.
2012-March-19 18:19 GMT
Mozilla Firefox, Thunderbird, and SeaMonkey contain a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks. Updates are available.
Red Hat Enterprise Linux Optional Productivity Applications
5 (IA-32, x86-64)
Red Hat Enterprise Linux Server
6 (IA-32, PPC, PPC 64, s390, s390x, x86_64)
Red Hat Enterprise Linux Server EUS
6.2.z (IA-32, PPC, PPC64, s390, s390x, x86_64)
Red Hat Enterprise Linux Workstation
6 (IA-32, x86_64)
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