CVE-2006-1993 Use after free in n/a

What is CVE-2006-1993?

CVE-2006-1993 is a medium-severity use after free vulnerability in Mozilla Firefox, published on 25 Apr 2006. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Mozilla Firefox 1.5.0.2, when designMode is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code via certain Javascript that is not properly handled by the contentWindow.focus method in an iframe, which causes a reference to a deleted controller context object. NOTE: this was originally claimed to be a buffer overflow in (1) js320.dll and (2) xpcom_core.dll, but the vendor disputes this claim.

Weakness: CWE-399

Which versions are affected by CVE-2006-1993?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2006-1993?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2006-1993 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-1993 exists.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DSA-1053-1, DSA-1055-1, GHSA-gh5c-2j93-h8q7.