Strumpf Noir Society Advisories ! Public release ! <--# -= InstantServers MiniPortal Multiple Vulnerabilities =- Release date: Saturday, February 9, 2002 Introduction: InstantServers' MiniPortal provides a complete solution for fast and easy web site hosting on a Windows PC. It features a (Apache- based) HTTP server as well as a FTP server by default. MiniPortal is available from vendor InstantServers' website: http://www.instantservers.com Problem(s): The FTP server coming with MiniPortal contains multiple vulnerabilities which could be exploited by an attacker to obtain user account information, read access to any file on the local HD and which could lead to arbitrary code execution. MiniPortal Plaintext Account and Session Data MiniPortal stores its account information in plaintext .pwd files in the miniportal/apache directory. Also, full login and session data is stored plaintext in the file miniportal/mplog.txt. Through either physical access to the system or by abusing below described directory traversal problem, elevated privileges could be obtained on the system in question by retrieving these files. MiniPortal Directory Traversal Vulnerability The FTP server supplied with MiniPortal does not properly restrict access to files outside of the user directory. By using a 'triple dot' notation ('.../file.ext') an attacker can break out of this directory and obtain read access to any file on the local disk. (This vulnerability only seems to work on WinNT/Win2k server systems, a discussion in regards to why this is is still going on on the vuln-dev list :) MiniPortal Login Buffer Overflow Vulnerability Due to improper bounds checking, a buffer overflow condition is in existence in one of the logging routines of said FTP server. This can be exploited by supplying the server with overly long (>4093 bytes) input at login. Besides crashing the FTP server, this can be exploited to execute arbitrary code on the system. (..) Solution: Vendor has been notified and has made version MiniPortal v1.1.6 available, which supplies fixes/workarounds for these issues. This was tested against MiniPortal v1.1.5 on Win2k. yadayadayada SNS Research is rfpolicy (http://www.wiretrip.net/rfp/policy.html) compliant, all information is provided on AS IS basis. EOF, but Strumpf Noir Society will return!
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