According to Tipping Point's Zero Day Initiative, the vulnerability, which it rates as critical, was reported within the first five hours of Firefox 3's release.
"Once the vulnerability was verified in TippingPoint's DVLabs and acquired from the researcher, the vulnerability was promptly reported to the Mozilla security team," said a representative.
Although the Zero Day Initiative team does not offer specifics until the vendor has a chance to patch it, the blog post did say this vulnerability, which also affects Firefox 2, requires user interaction and could result in an attacker executing arbitrary code.
Mozilla is reported to be working on a fix.
The Zero Day Initiative has been criticized in the past for paying researchers who find vulnerabilities.
On the heels of ActiveX vulnerabilities in the image uploading tools for Facebook and MySpace.com, researchers warned Monday that Yahoo Instant Messenger and Yahoo Messenger are vulnerable to ActiveX-based attacks.
Researcher Elazar Broad has disclosed a Boundary Condition vulnerability within mediagrid.dll, version 2.2.2 56. Researchers Krystian Kloskowski and Broad have disclosed a second Boundary Condition vulnerability within datagrid.dll, version 2.2.2 56c. And Kloskowski alone has disclosed a buffer overflow within datagrid.dll 2.2.2 56, which affects the AddImage function.
The three vulnerabilities are present within Yahoo Instant Messenger version 3.5 and Yahoo Messenger versions 4.0, 5.0, and 5.5, and could allow an attacker to compromise affected systems.
There are no known public exploits for these at this time. There is no patch available.
The existing workaround includes enabling the ActiveX control for each. Microsoft provides more details here . The specific CLSIDs for the ActiveX controls involved are:
Yahoo! MediaGrid: CLSID 22FD7C0A-850C-4A53-9821-0B0915C96139
Yahoo! DataGrid: CLSID 5F810AFC-BB5F-4416-BE63-E01DD117BD6C2
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