9.3 High
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
0.929 High
EPSS
Percentile
99.0%
The Microsoft Windows Media Services NMSA Session Description Object ActiveX control fails to restrict access to dangerous methods. This vulnerability could allow a remote attacker to execute arbitrary code on an affected system.
Microsoft Windows Media Services is a software package for Windows systems that provides the ability to stream Windows Media content. Included in the Windows Media Services package is an ActiveX control called NMSA Media Description Object, which is provided by the file mdsauth.dll
. This ActiveX control, which is marked “Safe for scripting” via the iObjectSafety
interface, includes methods that can be used to overwrite arbitrary files with attacker-provided content.
The vulnerable control comes with Windows Media Services 4.1, including the Windows Media Administrator software. Other software may also include the vulnerable control.
By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker can overwrite arbitrary files. This may allow the attacker to be able to execute arbitrary code with the privileges of the user.
Apply an update
Microsoft has addressed this issue in Microsoft Security Bulletin MS07-027. Users should review this bulletin and apply the patches it refers to.
Workarounds
Disable the NMSA Session Description Object ActiveX control in Internet Explorer
The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:
{D4FE6227-1288-11D0-9097-00AA004254A0}
More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG
file and imported to set the kill bit for this control:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{D4FE6227-1288-11D0-9097-00AA004254A0}]
"Compatibility Flags"=dword:00000400
Disable ActiveX
Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the “Securing Your Web Browser” document.
500753
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Updated: May 10, 2007
Affected
We have not received a statement from the vendor.
The vendor has not provided us with any further information regarding this vulnerability.
Microsoft has addressed this issue in Microsoft Security Bulletin MS07-027. Users should review this bulletin and apply the patches it refers to.
If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23500753 Feedback>).
Group | Score | Vector |
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Base | ||
Temporal | ||
Environmental |
This vulnerability was reported by Microsoft. Microsoft, in turn, acknowledges cocoruder of Fortinet Security Research for reporting this vulnerability to them.
This document was written by Chad R Dougherty and Will Dormann.
CVE IDs: | CVE-2007-2221 |
---|---|
Severity Metric: | 16.20 Date Public: |