By Caroline McCarthy
Staff writer, CNET News.com
February 7, 2007
A security company has reported two new flaws in the Mozilla Firefox
browser that may leave locally saved files vulnerable to outside
Both flaws were announced by SecuriTeam, a division of Beyond Security,
this week. The first flaw lies in Firefox's pop-up blocker feature,
according to a SecuriTeam statement on Monday. The browser typically
does not allow Web sites to access files that are stored locally,
according to the official report, but this URL permission check is
superseded when a Firefox user has turned off pop-up windows manually.
As a result, an attacker could use this flaw to steal locally stored
files and personal information that might be stored in them.
A possible scenario for such an attack would involve the user clicking
on a malicious link that would furtively plant a target file equipped
with an exploit code on the computer's hard drive. Then it would display
a prompt asking the user to allow a pop-up to appear in order to play a
video file or download. The attacker-supplied file would then be loaded
thanks to the browser flaw, which could give the attacker local file
It appears that this flaw may only apply to older versions of Firefox,
prior to the current 2.0 release, but Beyond Security was unavailable
for comment on the matter.
The second flaw, announced by SecuriTeam on Wednesday, concerns
Firefox's phishing protection feature. With this vulnerability, an adept
phisher could fool the browser into believing that a fraudulent site is
actually secure by adding particular characters into the URL of its Web
The phishing flaw does appear to apply to the current 22.214.171.124 version of
Mozilla was unavailable for comment on Wednesday.
Subscribe to the InfoSec News RSS Feed