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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(10130);
- script_bugtraq_id(283);
- script_version ("$Revision: 1.23 $");
- script_cve_id("CVE-1999-0920");
-
- name["english"] = "ipop2d buffer overflow";
- name["francais"] = "dΘpassement de buffer dans ipop2d";
-
- script_name(english:name["english"],
- francais:name["francais"]);
-
- desc["english"] = "
- There is a buffer overflow in the imap suite provided with Debian GNU/Linux
- 2.1, which has a vulnerability in its POP-2 daemon, found in the ipopd
- package. This vulnerability allows an attacker to gain a shell as user
- 'nobody', but requires the attacker to have a valid pop2 account.
-
- Risk factor : Medium";
-
- desc["francais"] = "Il y a un dΘpassement de buffer dans la suite
- imap distribuΘe avec Debian GNU/Linux 2.1, plus prΘcisement dans
- le server POP-2. Ce problΦme permet α une personne hostile
- d'obtenir un shell, en tant que 'nobody', mais nΘcΘssite d'avoir
- un compte pop2 valide
-
- Facteur de risque : Moyen";
-
- script_description(english:desc["english"],
- francais:desc["francais"]);
-
- summary["english"] = "checks for a buffer overflow in pop2d";
- summary["francais"] = "vΘrifie la prΘsence d'un dΘpassement de buffer dans pop2d";
- script_summary(english:summary["english"],
- francais:summary["francais"]);
-
- script_category(ACT_MIXED_ATTACK); # mixed
-
-
- script_copyright(english:"This script is Copyright (C) 1999 Renaud Deraison",
- francais:"Ce script est Copyright (C) 1999 Renaud Deraison");
-
- family["english"] = "Gain a shell remotely";
- family["francais"] = "Obtenir un shell α distance";
- script_family(english:family["english"],
- francais:family["francais"]);
- script_dependencie("find_service.nes", "logins.nasl");
- script_require_keys("pop2/password");
- script_require_ports("Services/pop2", 109);
- exit(0);
- }
-
-
- port = get_kb_item("Services/pop2");
- if(!port)port = 109;
-
- acct = get_kb_item("pop2/login");
- pass = get_kb_item("pop2/password");
-
-
-
-
- if((!acct) || (safe_checks()))
- {
- banner = get_kb_item(string("pop2/banner/", port));
- if(!banner)
- {
- if(get_port_state(port))
- {
- soc = open_sock_tcp(port);
- if(!soc)exit(0);
- banner = recv_line(socket:soc, length:4096);
- close(soc);
- }
- }
- if(banner)
- {
- if(ereg(pattern:"POP2 .* ((v[0-3]\..*)|(v4\.[0-4].*))",
- string:banner))
- {
- alrt = "
- The remote pop server may be vulnerable to
- a buffer overflow in the FOLD command.
-
- This allows authenticated users to gain an
- interactive shell on this host.
-
- *** Nessus solely relied on banner information
- *** to issue this warning
-
- Solution : upgrade
- Risk factor : Medium";
-
- security_warning(port:port, data:alrt);
- }
- }
- exit(0);
- }
-
-
-
- if((acct == "")||(pass == ""))exit(0);
-
-
- if(get_port_state(port))
- {
- s1 = string("HELO ",get_host_name(), ":", acct, " ", pass, "\r\n");
- s2 = string("FOLD ", crap(1024), "\r\n");
- soc = open_sock_tcp(port);
- if(!soc)exit(0);
- b = recv_line(socket:soc, length:1024);
- if(!strlen(b)){
- close(soc);
- exit(0);
- }
- send(socket:soc, data:s1);
- b = recv_line(socket:soc, length:1024);
- send(socket:soc, data:s2);
- c = recv_line(socket:soc, length:1024);
- if(strlen(c) == 0)security_warning(port);
- close(soc);
- }
-
-