Pi3Web <= 2.0.3 ISAPI Remote Denial of Service Exploit

ID EDB-ID:7109
Type exploitdb
Reporter Hamid Ebadi
Modified 2008-11-13T00:00:00


Pi3Web <= 2.0.3 (ISAPI) Remote Denial of Service Exploit. CVE-2008-6938. Dos exploit for windows platform

                                            Pi3Web ISAPI DoS vulnerability
Discovered by: Hamid Ebadi
CSIRT Team Member
Amirkabir University CSIRT Laboratory (APA Laboratory)
Pi3Web is a free, multithreaded, highly configurable and extensible HTTP server and development environment for cross platform internet server development and deployment. Pi3web is vulnerable to a denial of service (DoS) vulnerability whenever an invalid ISAPI module is requested from server.
Vulnerable version
Pi3Web &lt;=2.0.3
By requesting the following URL from pi3web the server crashes:
EnhPi3.exe -Bad Image
The application or DLL c:\Pi3Web\Isapi\users.txt is not a valid Windows image. Please check this against your installation diskette The vulnerability is caused.
The crash is due to insufficient checks for incoming requests. Whenever a file in ISAPI directory, which is not a valid DLL is requested, the server tries to load it into memory as a DLL library and a crash happens.
Before an official patch is released, use one of the following workarounds to mitigate the problem:
1. Disable ISAPI mapping in server configuration in Server Admin &gt; Mapping Tab.
2. Delete the users.txt, install.daf and readme.daf in ISAPI folder.
This vulnerability has been discovered by Hamid Ebadi from Amirkabir university CSIRT laboratory.

# milw0rm.com [2008-11-13]