# Original script written by Tenable Network Security
# Modified by Scott Shebby scotts@scanalert.com
# OS check by George Theall
if(description)
{
 script_id(12280);
 script_bugtraq_id(9921);
 script_cve_id("CAN-2004-0174");
 script_version("$Revision: 1.8 $");

 name["english"] = "Apache Connection Blocking Denial of Service";

 script_name(english:name["english"]);

 desc["english"] = "The remote web server appears to be running a version of 
Apache that is less that 2.0.49 or 1.3.31.

These versions are vulnerable to a denial of service attack where a remote 
attacker can block new connections to the server by connecting to a listening 
socket on a rarely accessed port.

Solution: Upgrade to Apache 2.0.49 or 1.3.31.";
 script_description(english:desc["english"]);

 summary["english"] = "Checks for version of Apache";

 script_summary(english:summary["english"]);

 script_category(ACT_GATHER_INFO);


 script_copyright(english:"This script is Copyright (C) 2004 Scott Shebby");
 family["english"] = "Misc.";
 script_family(english:family["english"]);
 if ( ! defined_func("bn_random") )
	script_dependencie("http_version.nasl", "os_fingerprint.nasl");
 else
 	script_dependencie("http_version.nasl", "os_fingerprint.nasl", "macosx_SecUpd20040503.nasl", "macosx_SecUpd20040126.nasl", "macosx_SecUpd20041202.nasl");
 script_require_keys("www/apache");
 script_require_ports("Services/www", 80);
 exit(0);
}

#
# The script code starts here
#
include("http_func.inc");
include("backport.inc");

if ( get_kb_item("CAN-2004-0174") ) exit(0);

port = get_http_port(default:80);
if(!port) exit(0);
if(!get_port_state(port))exit(0);

# nb: don't bother checking if platform is known to be unaffected. (george theall)
os = get_kb_item("Host/OS/icmp");
if (os && ereg(pattern:"FreeBSD|Linux", string:os, icase:TRUE)) exit(0);



banner = get_backport_banner(banner:get_http_banner(port: port));
if(!banner)exit(0);

serv = strstr(banner, "Server");
if(ereg(pattern:"^Server:.*Apache(-AdvancedExtranetServer)?/2\.0\.([0-9][^0-9]|[0-3][0-9]|4[0-8])", string:serv))
 {
   security_warning(port);
   exit(0);
 }
if(ereg(pattern:"^Server:.*Apache(-AdvancedExtranetServer)?/(1\.([0-2]\.|3\.([0-9][^0-9]|[0-2][0-9]|30)))", string:serv))
 {
   security_warning(port);
   exit(0);
 }
