203
Squid proxy up to 2.5 NTLM authentication ntlm_fetch_string Denial of Service
Firewalls
2004/09/10
Marc Ruef
marc dot ruef at computec dot ch
http://www.computec.ch
computec.ch
Marc Ruef
marc dot ruef at computec dot ch
http://www.computec.ch
computec.ch
2004/11/13
1.1
Corrected the plugin structure and added the accuracy values in 1.1
tcp
3128
open|send GET http://www.computec.ch HTTP/1.0\nHost: http://www.computec.ch\n\n|sleep|close|pattern_exists *Server Squid/[0-1].* OR *Server Squid/2.[0-5]*
80
Check is inspired by the Nessus plugin (see Nessus ID listed in the sources). Perhaps the Squid proxy is running on another port (e.g. 8080).
Marco Ortisi
http://www.squid-cache.org
Squid Team
2004/06/09
http://www.squid-cache.org/bugs/show_bug.cgi?id=1045
Squid up to 2.5
Squid without NTLM authentication, Squid 2.5 and newer or other proxy solutions
Buffer Overflow
The remote host seems to be running a Squid proxy. Squid up to 2.5 has a denial of service vulnerability if the NTLM authentication string is too long. An attacker may crash the remote proxy or be able to run arbitrary code in the context of the server.
The server should be deactivated or de-installed if not necessary. If this is not possible, you should upgrade the software to the latest version and do not use NTLM authentication. To make it harder to find the server the daemon could be configured to listen at another port (e.g. 8099). Try to prevent unwanted connection attempts by filtering traffic with firewalling. Alternation of the application banner can confuse an attacker and let him determine the wrong software.
Approx. 50 minutes
Yes
http://www.securityfocus.com/bid/10500/exploit/
Yes
Yes
Medium
6
7
9
7
High
Nessus is able to do the same check more accurate.
CAN-2004-0541
10500
12444
12294
Hacking Exposed: Network Security Secrets & Solutions, Stuart McClure, Joel Scambray and George Kurtz, February 25, 2003, 4th Edition, McGraw-Hill Osborne Media, ISBN 0072227427
http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/squid-2.5.STABLE6-ntlm_fetch_string.patch
