CVE-2009-3376

Description

Mozilla Firefox before 3.0.15 and 3.5.x before 3.5.4, and SeaMonkey before 2.0, does not properly handle a right-to-left override (aka RLO or U+202E) Unicode character in a download filename, which allows remote attackers to spoof file extensions via a crafted filename, as demonstrated by displaying a non-executable extension for an executable file.

Category

9.3
CVSS
Severity: Critical
CVSS 2.0 •
EPSS 3.02% Top 15%
Vendor Advisory redhat.com Vendor Advisory sun.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory mandriva.com Vendor Advisory mozilla.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.redhat.com/support/errata/RHSA-2010-0153.html vendor advisory
http://www.vupen.com/english/advisories/2010/0648 vdb entry
http://www.vupen.com/english/advisories/2010/0650 vdb entry
http://sunsolve.sun.com/search/document.do?assetkey=1-26-272909-1 vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=511521
http://lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html vendor advisory
http://secunia.com/advisories/38977 third party advisory
http://www.redhat.com/support/errata/RHSA-2010-0154.html vendor advisory
http://www.mozilla.org/security/announce/2009/mfsa2009-62.html patch vendor advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11218 vdb entry signature
http://www.ubuntu.com/usn/USN-915-1 vendor advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6541 vdb entry signature
http://www.vupen.com/english/advisories/2009/3334 vdb entry
http://www.mandriva.com/security/advisories?name=MDVSA-2009:294 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2009-3376?
CVE-2009-3376 has been scored as a critical severity vulnerability.
How to fix CVE-2009-3376?
To fix CVE-2009-3376, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2009-3376 being actively exploited in the wild?
It is possible that CVE-2009-3376 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.