Microsoft IIS 7.5 Error Message mypage Search cross site scripting

Summaryinfo

A vulnerability classified as critical was found in Microsoft IIS 7.5. The affected element is an unknown function of the file mypage of the component Error Message Handler. Executing a manipulation of the argument Search with the input %3cb%20onclick%3dalert(1)>%3e can lead to cross site scripting. The attack may be launched remotely. Furthermore, there is an exploit available. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability has been found in Microsoft IIS 7.5 (Web Server) and classified as critical. This vulnerability affects an unknown function of the file mypage of the component Error Message Handler. The manipulation of the argument search with the input value %3cb%20onclick%3dalert(1)>%3e leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. As an impact it is known to affect integrity.

The weakness was shared 11/28/2014 as File 129308 as not defined advisory (Packetstorm). The advisory is shared for download at packetstormsecurity.com. The public release happened without coordination with the vendor. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1059.007. Responsible for the vulnerability is the following code:

<p>Exception message is: <b>A potentially dangerous Request.QueryString
value was detected from the client (search="<b onclick=alert(1)>...").</b></p>

A public exploit has been developed in URL/Javascript and been published immediately after the advisory. It is possible to download the exploit at packetstormsecurity.com. It is declared as highly functional. As 0-day the estimated underground price was around $5k-$25k.

Proper firewalling of is able to address this issue.

The vulnerability is also documented in the vulnerability database at X-Force (98975). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Web Server

Vendor

• Microsoft

Name

• IIS

Version

• 7.5

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Once again VulDB remains the best source for vulnerability data.

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