Plugin ID | 203 |
Plugin name | Squid proxy up to 2.5 NTLM authentication ntlm_fetch_string Denial of Service |
Plugin filename | Squid proxy up to 2.5 NTLM authentication ntlm_fetch_string Denial of Service.plugin |
Plugin filesize | 3896 bytes |
Plugin family | Firewalls |
Plugin created name | Marc Ruef |
Plugin created email | marc dot ruef at computec dot ch |
Plugin created web | http://www.computec.ch |
Plugin created company | computec.ch |
Plugin created date | 2004/09/10 |
Plugin updated name | Marc Ruef |
Plugin updated email | marc dot ruef at computec dot ch |
Plugin updated web | http://www.computec.ch |
Plugin updated company | computec.ch |
Plugin updated date | 2004/11/13 |
Plugin version | 1.1 |
Plugin changelog | Corrected the plugin structure and added the accuracy values in 1.1 |
Plugin protocol | tcp |
Plugin port | 3128 |
Plugin procedure detection | 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]* |
Plugin detection accuracy | 80 |
Plugin comment | 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). |
Bug published name | Marco Ortisi |
Bug published web | http://www.squid-cache.org |
Bug published company | Squid Team |
Bug published date | 2004/06/09 |
Bug advisory | http://www.squid-cache.org/bugs/show_bug.cgi?id=1045 |
Bug affected | Squid up to 2.5 |
Bug not affected | Squid without NTLM authentication, Squid 2.5 and newer or other proxy solutions |
Bug vulnerability class | Buffer Overflow |
Bug description | 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. |
Bug solution | 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. |
Bug fixing time | Approx. 50 minutes |
Bug exploit availability | Yes |
Bug exploit url | http://www.securityfocus.com/bid/10500/exploit/ |
Bug remote | Yes |
Bug local | Yes |
Bug severity | Medium |
Bug popularity | 6 |
Bug simplicity | 7 |
Bug impact | 9 |
Bug risk | 7 |
Bug Nessus risk | High |
Bug check tools | Nessus is able to do the same check more accurate. |
Source CVE | CAN-2004-0541 |
Source SecurityFocus BID | 10500 |
Source Secunia ID | 12444 |
Source Nessus ID | 12294 |
Source Literature | Hacking Exposed: Network Security Secrets & Solutions, Stuart McClure, Joel Scambray and George Kurtz, February 25, 2003, 4th Edition, McGraw-Hill Osborne Media, ISBN 0072227427 |
Source Misc. | http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/squid-2.5.STABLE6-ntlm_fetch_string.patch |