NGSSoftware Insight Security Research Advisory Name: Multiple Remote Buffer Overruns TOMAHAWKS' STEELARROW Systems Affected: WinNT, Win2K (Not tested on other platforms) Severity: High Risk Category: Remote System Buffer Overrun Vendor URL: http://www.tomahawk.com Author: Mark Litchfield (markat_private) Date: 19th August 2002 Advisory number: #NISR19082002B Description *********** SteelArrow is an easy to use Web Application Server offering the latest in Internet connectivity and dynamic content development. SteelArrow offers developers full web application development functionality and fully tested run time reliability. Steelarrow operates as an extension (on WinNT/2K) to Microsoft IIS, Apache and Netscape Enterprise servers. Details ******* Buffer Overrun 1) SteelArrow tracks user sessions with cookies in the form of UserIdent=XXXXXXXXXXXX. By supplying an overly long vlaue in the Cookie HTTP header a buffer overflow occurs in the Steelarrow Service (Steelarrow.exe) overwriting a saved return address on the stack. Steelarrow, by default on Win2k/WinNT is installed as a system service. Any arbitary code executed using this vulnerability will run with system privileges. Buffer Overrun 2) By making an overly long request for a .aro (extension used by Steelarrow) file, an access violation occurs in DLLHOST.EXE (Steelarrow.dll), again overwriting a saved return address on the stack. Any code will execute in the security context of the IWAM account. Buffer Overrun 3) It's that Chunked Transfer-Encoding issue again. By making a request for a .aro file an including a specific Transfer-Encoding: Chunked request within the HTTP request header fields and access violation occurs in DLLHOST.EXE due to a heap overflow. Again any arbitary code execution will run in the context of the IWAM account. Fix Information *************** NGSSoftware alerted the vendor to these buffer overflow issues on the 1st 2nd and 3rd of April 2002. A fix is available from http://www.steelarrow.com A check for these issues has been added to Typhon II, of which more information is available from the NGSSoftware website, http://www.ngssoftware.com. Further Information ******************* For further information about the scope and effects of buffer overflows, please see http://www.ngssoftware.com/papers/non-stack-bo-windows.pdf http://www.ngssoftware.com/papers/ntbufferoverflow.html http://www.ngssoftware.com/papers/bufferoverflowpaper.rtf http://www.ngssoftware.com/papers/unicodebo.pdf
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