LeRoi
09-08-2003, 09:00 AM
TITLE:
Special Update: Microsoft Internet Explorer Multiple Vulnerabilities
SECUNIA ADVISORY ID:
SA9580
VERIFY ADVISORY:
http://www.secunia.com/advisories/9580/
CRITICAL:
Extremely critical
IMPACT:
System access
WHERE:
From remote
REVISION:
3.0 originally posted 2003-08-20
SOFTWARE:
Microsoft Internet Explorer 6
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 5.01
DESCRIPTION:
Microsoft has issued a cumulative patch for Internet Explorer, which
fixes multiple vulnerabilities. The worst vulnerability can lead to
execution of arbitrary code on the client system via HTML emails or
web sites.
1) A cross domain vulnerability exists in the way Internet Explorer
retrieves files from the cache. This can be exploited by a malicious
HTML document to execute arbitrary scripting in the "My Computer
Zone".
2) Internet Explorer determines whether an object is safe when it
interprets the file extension specified in the "Object Data" tag.
This allows a malicious person to specify a "safe" file with eg. a
".html" extension in "Object Data", which causes Internet Explorer to
interpret it as a "safe" file. However, when the file is retrieved by
Internet Explorer the "Content-Type" header determines how the file
will be treated. This allows an executable file like a ".hta" file to
be treated as a "safe" file and be executed silently without
restrictions.
NOTE: Further information has been released by http-equiv, proving
that the patch from Microsoft is not adequate. Please refer to
solution section.
Secunia has constructed a vulnerability test, which can be used to
check if you are affected by this issue:
http://www.secunia.com/MS03-032/
3) The Kill Bit will be set on the Windows Reporting Tool ActiveX
control "BR549.DLL". This ActiveX control contains a vulnerability
which could be exploited by malicious HTML documents to execute
arbitrary code.
Furthermore, a language specific variant of the older object type tag
buffer overflow vulnerability (MS03-020) has been identified and is
fixed in this patch.
This update also fixes other minor issues.
The "Object Data" vulnerability is straight forward to exploit. In
many ways this vulnerability is similar to MS01-020 which was
exploited by notorious viruses like Nimda, Badtrans and Klez.
NOTE: Secunia has discovered exploitation of the "Object Data"
vulnerability in the wild. Analysis shows that the exploit installs a
program called ADPlus module or SurferBar, which is added to a users
Internet Explorer and contains links to various porn sites. The
exploit does the following:
1) User receives an email, which exploits the "Object Data"
vulnerability.
2) The resource "a.cgi" is automatically requested from a webserver
(63.246.130.201), which installs the file "drg.exe" in "C:\".
3) The file is then executed and saves the resource "surferbar.dll"
from the same webserver as "win32.dll" (originally named
"adplus.dll") in the "C:\\Program Files\" directory.
4) The file "win32.dll" is then executed by "regsvr32" and adds a bar
to the user's Internet Explorer.
SOLUTION:
Deactivate Active Scripting in Internet Explorer, until a patch
becomes available which fixes the new variant of the "Object Data"
vulnerability.
NOTE: The patch below does not fix the variant of the "Object Data"
vulnerability discovered by http-equiv.
The patch is available from:
http://windowsupdate.microsoft.com/
or
http://www.microsoft.com/windows/ie/downlo...925/default.asp (http://www.microsoft.com/windows/ie/downloads/critical/822925/default.asp)
REPORTED BY / CREDITS:
1) Yu-Arai, LAC
2) Drew Copley, eEye Digital Security
3) Greg Jones, KPMG UK
http-equiv has supplied additional information about exploitation of
the "Object Data" vulnerability.
CHANGELOG:
2003-08-21: Updated critical rating and description due to detailed
information from eEye.
2003-08-22: Included link to Secunia vulnerability test.
2003-09-03: Secunia has discovered exploitation of the "Object Data"
vulnerability in the wild.
2003-09-07: Patch for the "Object Data" vulnerability has been proven
inadequate by http-equiv.
ORIGINAL ADVISORY:
http://www.microsoft.com/technet/security/...in/MS03-032.asp (http://www.microsoft.com/technet/security/bulletin/MS03-032.asp)
http://www.eeye.com/html/Research/Advisori...AD20030820.html (http://www.eeye.com/html/Research/Advisories/AD20030820.html)
Special Update: Microsoft Internet Explorer Multiple Vulnerabilities
SECUNIA ADVISORY ID:
SA9580
VERIFY ADVISORY:
http://www.secunia.com/advisories/9580/
CRITICAL:
Extremely critical
IMPACT:
System access
WHERE:
From remote
REVISION:
3.0 originally posted 2003-08-20
SOFTWARE:
Microsoft Internet Explorer 6
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 5.01
DESCRIPTION:
Microsoft has issued a cumulative patch for Internet Explorer, which
fixes multiple vulnerabilities. The worst vulnerability can lead to
execution of arbitrary code on the client system via HTML emails or
web sites.
1) A cross domain vulnerability exists in the way Internet Explorer
retrieves files from the cache. This can be exploited by a malicious
HTML document to execute arbitrary scripting in the "My Computer
Zone".
2) Internet Explorer determines whether an object is safe when it
interprets the file extension specified in the "Object Data" tag.
This allows a malicious person to specify a "safe" file with eg. a
".html" extension in "Object Data", which causes Internet Explorer to
interpret it as a "safe" file. However, when the file is retrieved by
Internet Explorer the "Content-Type" header determines how the file
will be treated. This allows an executable file like a ".hta" file to
be treated as a "safe" file and be executed silently without
restrictions.
NOTE: Further information has been released by http-equiv, proving
that the patch from Microsoft is not adequate. Please refer to
solution section.
Secunia has constructed a vulnerability test, which can be used to
check if you are affected by this issue:
http://www.secunia.com/MS03-032/
3) The Kill Bit will be set on the Windows Reporting Tool ActiveX
control "BR549.DLL". This ActiveX control contains a vulnerability
which could be exploited by malicious HTML documents to execute
arbitrary code.
Furthermore, a language specific variant of the older object type tag
buffer overflow vulnerability (MS03-020) has been identified and is
fixed in this patch.
This update also fixes other minor issues.
The "Object Data" vulnerability is straight forward to exploit. In
many ways this vulnerability is similar to MS01-020 which was
exploited by notorious viruses like Nimda, Badtrans and Klez.
NOTE: Secunia has discovered exploitation of the "Object Data"
vulnerability in the wild. Analysis shows that the exploit installs a
program called ADPlus module or SurferBar, which is added to a users
Internet Explorer and contains links to various porn sites. The
exploit does the following:
1) User receives an email, which exploits the "Object Data"
vulnerability.
2) The resource "a.cgi" is automatically requested from a webserver
(63.246.130.201), which installs the file "drg.exe" in "C:\".
3) The file is then executed and saves the resource "surferbar.dll"
from the same webserver as "win32.dll" (originally named
"adplus.dll") in the "C:\\Program Files\" directory.
4) The file "win32.dll" is then executed by "regsvr32" and adds a bar
to the user's Internet Explorer.
SOLUTION:
Deactivate Active Scripting in Internet Explorer, until a patch
becomes available which fixes the new variant of the "Object Data"
vulnerability.
NOTE: The patch below does not fix the variant of the "Object Data"
vulnerability discovered by http-equiv.
The patch is available from:
http://windowsupdate.microsoft.com/
or
http://www.microsoft.com/windows/ie/downlo...925/default.asp (http://www.microsoft.com/windows/ie/downloads/critical/822925/default.asp)
REPORTED BY / CREDITS:
1) Yu-Arai, LAC
2) Drew Copley, eEye Digital Security
3) Greg Jones, KPMG UK
http-equiv has supplied additional information about exploitation of
the "Object Data" vulnerability.
CHANGELOG:
2003-08-21: Updated critical rating and description due to detailed
information from eEye.
2003-08-22: Included link to Secunia vulnerability test.
2003-09-03: Secunia has discovered exploitation of the "Object Data"
vulnerability in the wild.
2003-09-07: Patch for the "Object Data" vulnerability has been proven
inadequate by http-equiv.
ORIGINAL ADVISORY:
http://www.microsoft.com/technet/security/...in/MS03-032.asp (http://www.microsoft.com/technet/security/bulletin/MS03-032.asp)
http://www.eeye.com/html/Research/Advisori...AD20030820.html (http://www.eeye.com/html/Research/Advisories/AD20030820.html)