Cisco Catalyst Telnetd Authentication Failure Saturation Memory Leak Remote DoS (CSCds66191)

2002-06-05T00:00:00
ID CSCDS66191.NASL
Type nessus
Reporter This script is (C) 2002-2018 Tenable Network Security, Inc.
Modified 2020-10-02T00:00:00

Description

A series of failed telnet authentication attempts to the switch can cause the Catalyst Switch to fail to pass traffic or accept management connections until the system is rebooted or a power cycle is performed. All types of telnet authentication are affected, including Kerberized telnet, and AAA authentication.

This vulnerability is documented as Cisco bug ID CSCds66191.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#

# Script audit and contributions from Carmichael Security
#      Erik Anderson <eanders@carmichaelsecurity.com> (nb: domain no longer exists)
#      Added BugtraqID and CVE
#


include("compat.inc");

if(description)
{
 script_id(10978);
 script_version("1.20");
 script_cve_id("CVE-2001-0041");
 script_bugtraq_id(2072);

 script_name(english:"Cisco Catalyst Telnetd Authentication Failure Saturation Memory Leak Remote DoS (CSCds66191)");

 script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch." );
 script_set_attribute(attribute:"description", value:
"A series of failed telnet authentication attempts to the switch can 
cause the Catalyst Switch to fail to pass traffic or accept 
management connections until the system is rebooted or a power cycle 
is performed. All types of telnet authentication are affected, 
including Kerberized telnet, and AAA authentication.

This vulnerability is documented as Cisco bug ID CSCds66191." );
 script_set_attribute(attribute:"solution", value:
"http://www.nessus.org/u?2d0daaea" );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
 script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"true");
 script_cwe_id(399);

 script_set_attribute(attribute:"plugin_publication_date", value: "2002/06/05");
 script_cvs_date("Date: 2018/06/27 18:42:25");
 script_set_attribute(attribute:"vuln_publication_date", value: "2000/12/06");
 script_set_attribute(attribute:"plugin_type", value:"local");
 script_set_attribute(attribute:"cpe", value: "cpe:/o:cisco:ios");
 script_end_attributes();

 script_summary(english:"Uses SNMP to determine if a flaw is present");
 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is (C) 2002-2018 Tenable Network Security, Inc.");
 script_family(english:"CISCO");
 script_dependencie("snmp_sysDesc.nasl", "snmp_cisco_type.nasl");
 script_require_keys("SNMP/community", "SNMP/sysDesc", "CISCO/model");
 exit(0);
}

# The code starts here

ok=0;
os = get_kb_item("SNMP/sysDesc"); if(!os)exit(0);
hardware = get_kb_item("CISCO/model"); if(!hardware)exit(0);




# Check for the required hardware...
#----------------------------------------------------------------
# catalyst.*
if(ereg(string:hardware, pattern:"^catalyst.*$"))ok=1;

if(!ok)exit(0);
ok = 0;


# Check for the required operating system...
#----------------------------------------------------------------
# Is this CatOS ?
if(!egrep(pattern:".*Cisco Catalyst Operating System.*", string:os))exit(0);
# 4.5
if(egrep(string:os, pattern:"(4\.5\([0-9]\)|4\.5),"))ok=1;

# 5.5
if(egrep(string:os, pattern:"(5\.5\([0-4]\)|5\.5),"))ok=1;

# 6.3
if(egrep(string:os, pattern:"(6\.3\([0-2]\)|6\.3),"))ok=1;


#----------------------------------------------

if(ok)security_hole(port:161, proto:"udp");