JanaServer 2 http-server and pna-proxy Flaws Let Remote Users Deny Service
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SecurityTracker Alert ID: 1012365 |
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SecurityTracker URL: http://securitytracker.com/id/1012365
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Nov 30 2004
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): 2.4.4 and prior versions
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Description:
Luigi Auriemma reported a vulnerability in JanaServer 2 in the http-server and the pna-proxy. A remote user can cause denial of service conditions.
It is reported that a remote user can send a large number of percent sign characters ('%') to the target http-server on TCP port 2506 to cause the server to consume all available memory and CPU resources.
It is also reported that a remote user can send a specially crafted request (with a data block size larger than the data sent) to the pna-proxy on TCP port 1090 to cause the system to enter an infinite loop.
A remote user can exploit these flaws to cause the target service to freeze.
A demonstration exploit is available at:
http://aluigi.altervista.org/poc/janados.zip
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Impact:
A remote user can cause denial of service conditions on the target system.
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Solution:
The vendor has issued a fixed version (2.4.5), available at:
http://www.janaserver.de/start.php?lang=en&menue=download
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Vendor URL: www.janaserver.de/ (Links to External Site)
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Cause:
Exception handling error, Input validation error
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Underlying OS:
Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Tue, 30 Nov 2004 17:28:42 +0000
Subject: Endless loops in the http-server and pna-proxy modules of Jana
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#######################################################################
Luigi Auriemma
Application: Jana server 2
http://www.janaserver.de
Versions: <= 2.4.4
Platforms: Windows
Bug: endless loops in the http-server and pna-proxy modules
Exploitation: remote
Date: 30 November 2004
Author: Luigi Auriemma
e-mail: aluigi@altervista.org
web: http://aluigi.altervista.org
#######################################################################
1) Introduction
2) Bugs
3) The Code
4) Fix
#######################################################################
===============
1) Introduction
===============
Jana server 2 is a Windows server with a lot of modules to handle http,
ftp, mail, proxy and many other protocols.
#######################################################################
=======
2) Bugs
=======
The module http-server (port 2506) doesn't correctly handle too much %
chars with the temporary effect of continuing to allocate and free
memory until it is available and the conseguent CPU at 100%.
The module pna-proxy (port 1090), used to handle Real player requests,
instead is affected by an endless loop that happens when an attacker
specifies a data block size (a 16 bits value) bigger then the data
really sent.
Due to the type of vulnerabilities is possible to completely freeze the
entire server launching the attacks about 15 or more times.
#######################################################################
===========
3) The Code
===========
http://aluigi.altervista.org/poc/janados.zip
#######################################################################
======
4) Fix
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Version 2.4.5
#######################################################################
---
Luigi Auriemma
http://aluigi.altervista.org
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