 Some vulnerabilities have been discovered in Internet Explorer, which can be exploited by malicious people to compromise a user's system, conduct cross-site/zone scripting and bypass a security feature in Microsoft Windows XP SP2.
1) Insufficient validation of drag and drop events from the "Internet" zone to local resources for valid images or media files with embedded HTML code.
This can be exploited by e.g. a malicious web site to plant arbitrary HTML documents
on a user's system, which may allow execution of arbitrary script code in the
"Local Computer" zone.
NOTE: Microsoft Windows XP SP2 does not allow Active Scripting in the "Local
Computer" zone.
2) A security site / zone restriction error, where an embedded HTML Help control
on e.g. a malicious web site references a specially crafted index (.hhk) file,
can execute local HTML documents or inject arbitrary script code in context
of a previous loaded document using a malicious javascript URI handler.
Successful exploitation may allow execution of arbitrary HTML and script code
in a user's browser session in context of arbitrary sites, or execution of local
programs with parameters from the "Local Computer" zone using a HTML
Help shortcut.
NOTE: This will bypass the "Local Computer" zone lockdown security
feature in SP2.
3) A security site / zone restriction error in the handling of the "Related
Topics" command in an embedded HTML Help control can be exploited by e.g.
a malicious website to execute arbitrary script code in the context of arbitrary
sites or zones.
NOTE: This may be exploited to bypass the "Local Computer" zone lockdown
security feature in SP2.
Secunia has constructed a test, which can be used to check if your browser
is affected by this issue:
http://secunia.com/internet_explorer_command_execution_vulnerability_test/
Vulnerability 1 and 2, or 3 alone, in combination with an inappropriate behaviour
where the ActiveX Data Object (ADO) model can write arbitrary files can be exploited
to compromise a user's system.
This has been confirmed on a fully patched system with Internet Explorer 6.0
and Microsoft Windows XP SP2.
SOFTWARE:
Microsoft Internet Explorer 6
SOLUTION:
Use another product.
Alternative workarounds:
1) The vendor recommends that the "Drag and drop or copy and paste files" option is disabled.
2, 3) Set security level to high for the "Internet" zone.
PROVIDED AND/OR DISCOVERED BY:
1) Discovered independently by:
* http-equiv
* Andreas Sandblad of Secunia Research (reported to Microsoft on 2004-10-13).
2) Discovered by:
* http-equiv
Additional information provided by:
* Roozbeh Afrasiabi
3) Discovered by:
* Paul, Greyhats Security
* Michael Evanchik
Additional information provided by:
* ShredderSub7
CHANGELOG:
2004-10-21: Updated advisory.
2004-10-28: Added another workaround in "Solution" section and linked
to Microsoft Knowledge Base article.
2004-11-02: Updated with additional information in "Description" and
"Solution" section.
2004-11-29: Updated "Description" section with additional information
from Paul.
2004-12-23: Added link to US-CERT vulnerability note.
2004-12-25: Updated "Description" section with additional information
from Paul and Michael Evanchik.
2005-01-07: Increased rating. Added link to test. Updated "Description" and "Solution" sections.
ORIGINAL ADVISORY:
3)
http://freehost07.websamba.com/greyhats/sp2rc-analysis.htm
OTHER REFERENCES:
How to Disable "Drag and Drop or copy and paste files" option in
Internet Explorer:
http://support.microsoft.com/kb/888534
How to Disable Active Content in Internet Explorer:
http://support.microsoft.com/default.aspx?scid=kb;en-us;q154036
US-CERT VU#939688:
http://www.kb.cert.org/vuls/id/939688
VERIFY ADVISORY:
http://secunia.com/advisories/12889/
Secunia Security Advisories
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