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- #
- # This script was written by Adam Baldwin <adamb@amerion.net>
- #
- # See the Nessus Scripts License for details
- #
-
- if(description)
- {
- script_id(10768);
- script_bugtraq_id(3354);
- script_cve_id("CVE-2001-0843");
- script_version ("$Revision: 1.16 $");
- name["english"] = "DoSable squid proxy server";
- script_name(english:name["english"]);
- desc["english"] = "
- A problem exists in the way the remote Squid proxy server handles a
- special 'mkdir-only' PUT request, and causes denial of service to the proxy
- server.
-
- An attacker may use this flaw to prevent your LAN users from accessing
- the web.
-
- Solution: Apply the vendor released patch, for squid it is located here:
- www.squid-cache.org. You can also protect yourself by enabling access lists
- on your proxy.
-
- *** Note that Nessus solely relied on the version number of the remote
- *** proxy to issue this warning
-
- Risk factor : Medium / High";
- script_description(english:desc["english"]);
- summary["english"] = "Determines via ver. if a proxy server is DoSable";
- script_summary(english:summary["english"]);
- script_category(ACT_GATHER_INFO);
- family["english"] = "Denial of Service";
- script_family(english:family["english"]);
- script_copyright(english:"This script is Copyright (C) 2001 Adam Baldwin");
- script_dependencies("find_service.nes", "proxy_use.nasl");
- script_require_ports("Services/http_proxy", 8080, 3128);
- exit(0);
- }
-
- #
- # Code Starts Here
- #
-
- include("http_func.inc");
-
- port = get_kb_item("Services/http_proxy");
- if(!port)port = 3128;
- if(!get_port_state(port))port = 8080;
-
-
- if(get_port_state(port))
- {
- soc = http_open_socket(port);
- if(soc)
- {
- sData = http_get(item:"http://www.$$$$$", port:port);
- send(socket:soc, data:sData);
- data = http_recv(socket:soc);
- http_close_socket(soc);
- data = egrep(pattern: "^Server: ", string: data);
-
- if("Squid" >< data)
- {
- data = data - string("Server: Squid/");
- #See if it's a vulnerable version
- #CHECK VERSION 2.3
- if(("2.3" >< data) && ("STABLE2" >< data) ||
- ("STABLE3" >< data) ||
- ("STABLE4" >< data) ||
- ("STABLE5" >< data))
- {
- security_warning(port);
- }
- #CHECK VERSION 2.4
- if(("2.4" >< data) && ("STABLE1" >< data) ||
- ("PRE-STABLE2" >< data) ||
- ("PRE-STABLE" >< data) ||
- ("DEVEL4" >< data) ||
- ("DEVEL2" >< data))
- {
- security_warning(port);
- }
- }
- }
- }
-