![]() The username length and if the username contains commas. Parameter is done by the ValidateParameter() function, which basically checks The only validation (besides ASP.NET request validation) of the username )) with the parameters that the user has submitted to the form. Which calls the CreateUser() function of the The interesting one is "CreateUserWizard", Standard built-in controls for the membership management, for example, If developers are programming the "Microsoft way" then they will use the By exploiting this vulnerability an attacker is able to log onĪs a different existing user with all the privileges of the targeted user Microsoft ASP.NET membership system depends on theįormsAuthentication.SetAuthCookie(username, false) method for certainįunctionality. This vulnerability can be leveraged into an authentication bypass If the unicode stringĬontaining a null byte is passed, its length is incorrectly calculated, so onlyĬharacters before the null byte are copied into the buffer. The lstrlenW function returns the length of the string, inĬharacters not including the terminating null character. The unicode string length is determined using the lstrlenWįunction. The null byte termination vulnerability exists in theĬopyStringToUnAlingnedBuffer() function of the webengine4.dll library used by This advisory is an update to SEC Consult SA-20111230-0 with a detailed PoCįurthermore, SEC Consult created a PoC video which can be found here: Source: Vulnerability overview/description: NET Framework provides a comprehensive and consistent programming modelįor building applications that have visually stunning user experiences and NET to run an application on their computer. ".NET is an integral part of many applications running on Windows and providesĬommon functionality for those applications to run. Gudinavicius / SEC Consult Vulnerability Lab Title: Microsoft ASP.NET Forms Authentication Bypass SEC Consult Vulnerability Lab Security Advisory
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