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If you have found a vulnerability, please send to our SecurityAlert Database : secalert()securityreason()com
Also if you have new ( 0-day ) exploit, please send to our ExploitAlert Archive :
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Home SecurityAlert Database |
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Topic : | MSIE7 entrapment again (+ FF tidbit)
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SecurityAlert : 2892
CVE : CVE-2007-3827 CVE : CVE-2007-3826
SecurityRisk : Low (About)
Remote Exploit : Yes
Local Exploit : Yes
Exploit Given : Yes
Credit : Michal Zalewski
Published : 20.07.2007
Affected Software : | Microsoft Internet Explorer, FireFox |
 Advisory Text : Hello again,
Microsoft Internet Explorer seems to have a soft spot for browser
entrapment vulnerabilities. Just to recap, in these attacks, the user is
made believe he had left a webpage (and the URL bar or SSL state data
reinforce him in this belief) - but in reality, is prevented from doing
so, and his browser continues to display assorted content originating from
the attacker.
This is a close, but somewhat more sinister relative of vanilla URL bar
spoofing. I reported a few of each kind in the recent months.
Well, here's another one, this time based on document.open() calls. In
essence, repeatedly calling this function after a new URL is entered by
the user, before onBeforeUnload is invoked, inhibits page transition - but
target URL bar state is retained. This is remarkably silly.
A live demo is available here:
http://lcamtuf.coredump.cx/ietrap3/
That is all.
...
PS. The promised tidbit - since I'm leaving for a while and won't have
time to research this - in Firefox, javascript: windows can set
'domainless' cookies by specifying 'domain=.' - for example:
open("javascript:document.cookie='foo=bar;domain=.'","_blank");
Fortunately/unfortunately, these cookies do not get sent to all sites - no
session fixation - though can be retrieved by other null-domain
javascript: / data: pages. Specifying other domains won't work. Multiple
periods will be trimmed. Path can be set arbitrarily, with certain
exceptions. Null-domain cookies load properly when stored in cookies.txt.
Q: can this be used in a manner more sinister than merely facilitating
exchange of "markers" between various user-tracking sites?
/mz
Feedback :
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