What’s Vulnerable › Vulnerabilities

CVE-2013-0757

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 60.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2013-01-13 · updated 2026-06-16
• Weakness: CWE-20

Description

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not prevent modifications to the prototype of an object, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges by referencing Object.prototype.__proto__ in a crafted HTML document.

Affected products

• Canonical Ubuntu Linux: 10.04, 11.10, 12.04, 12.10
• Mozilla Firefox: before 17.0.2; before 18.0 — fixed in 17.0.2, 18.0
• Mozilla Seamonkey: before 2.15 — fixed in 2.15
• Mozilla Thunderbird: before 17.0.2 — fixed in 17.0.2
• Mozilla Thunderbird ESR: before 17.0.2 — fixed in 17.0.2
• Opensuse: 11.4, 12.1, 12.2
• SUSE Linux Enterprise Server 15 SP1: 10-sp4, 11-sp2
• SUSE Linux Enterprise Server: 10-sp4, 11-sp2
• SUSE Linux Enterprise Software Development Kit: 10-sp4, 11-sp2

How to fix

Upgrade to a fixed version: Mozilla Firefox 17.0.2, 18.0; Mozilla Seamonkey 2.15; Mozilla Thunderbird 17.0.2; Mozilla Thunderbird ESR 17.0.2. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00006.html
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00007.html
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00017.html
• http://www.mozilla.org/security/announce/2013/mfsa2013-14.html
• http://www.ubuntu.com/usn/USN-1681-1
• http://www.ubuntu.com/usn/USN-1681-2
• http://www.ubuntu.com/usn/USN-1681-4
• https://bugzilla.mozilla.org/show_bug.cgi?id=813901
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16939
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00006.html
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00007.html

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