[NT] InstantServers MiniPortal Multiple Vulnerabilities

From: support@securiteam.com
Date: 02/14/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Thu, 14 Feb 2002 18:44:15 +0100 (CET)

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  InstantServers MiniPortal Multiple Vulnerabilities
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SUMMARY

 <http://www.instantservers.com> 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.
The product contains multiple vulnerabilities.

DETAILS

Vulnerable systems:
MiniPortal version 1.1.5 and prior

Immune systems:
MiniPortal version 1.1.6

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. In addition, 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.

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.

ADDITIONAL INFORMATION

The information has been provided by
<mailto:vuln-dev@labs.secureance.com> Strumpf Noir Society.

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