Paper: http://www.exploit-db.com/docs/19527.pdf Security Research - .Net Framework Tilde Character DoS Website : http://soroush.secproject.com/blog/ I. BACKGROUND --------------------- "The .NET Framework is a software framework developed by Microsoft that runs primarily on Microsoft Windows. It includes a large library and provides language interoperability across several programming languages." (Wikipedia) II. DESCRIPTION --------------------- Vulnerability Research Team discovered a vulnerability in Microsoft .NET Framework. The vulnerability is caused by a tilde character "~" in a Get request, which could allow remote attackers to Deny the functionality of the server. III. AFFECTED PRODUCTS --------------------------- .Net Framework 1.0 Windows XP .Net Framework 1.1 Windows 2003 .Net Framework 2.0 Windows 2003 R2 .Net Framework 3.0 Windows 2008 .Net Framework 3.5 Windows 2008 R2 .Net Framework 4.0 Windows 2008 R2,Windows 7 IV. Binary Analysis & Exploits/PoCs --------------------------------------- In-depth technical analysis of the vulnerability and a functional exploit are available through: http://soroush.secproject.com/blog/2012/06/microsoft-iis-tilde-character-vulnerabilityfeature-short-filefolder-name-disclosure/ V. SOLUTION ---------------- There are still workarounds through Vendor and security vendors. VI. CREDIT -------------- This vulnerability was discovered by: Soroush Dalili (@irsdl) Ali Abbasnejad VII. REFERENCES ---------------------- http://support.microsoft.com/kb/142982/en-us http://soroush.secproject.com/blog/2010/07/iis5-1-directory-authentication-bypass-by-using-i30index_allocation/ VIII. DISCLOSURE TIMELINE ----------------------------- 2010-08-01 - Vulnerability Discovered 2010-08-03 - Vendor Informed 2010-12-01 - Vendor 1st Response 2011-01-04 - Vendor 2nd Response (next version fix) 2012-06-29 - Public Disclosure Proof of Concept: You have to monitor the server performance manually:
Target website: Example: http://www.aspnet-example.com/ or https://www.aspnet-example.com/ - Do not include filename
Maximum valid folder that can be added to your target: before receiving URL Too Long error
Loop Number: be careful as it can kill your server.





We do not accept any responsibility for bad usage of this PoC. Please only run it against your own server/websites.

Main reference: http://soroush.secproject.com/blog/2012/06/microsoft-iis-tilde-character-vulnerabilityfeature-short-filefolder-name-disclosure/