SSH CRC-32 Compensation Attack Remote Overflow

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


include("compat.inc");

if(description)
{
 script_id(10607);
 script_version ("1.39");
 script_cve_id("CVE-2001-0144");
 script_bugtraq_id(2347);
 
 script_name(english:"SSH CRC-32 Compensation Attack Remote Overflow");
 
 script_set_attribute(attribute:"synopsis", value:
"It is possible to execute arbitrary code on the remote host." );
 script_set_attribute(attribute:"description", value:
"The remote host is running a version of SSH that is older than version 1.2.32,
or a version of OpenSSH that is older than 2.3.0.

The remote version of this software is vulnerable to a flaw known as a 'CRC-32
compensation attack' that could allow an attacker to gain a root shell on this 
host." );
 script_set_attribute(attribute:"solution", value:
"Upgrade to version 1.2.32 of SSH which solves this problem,
or to version 2.3.0 of OpenSSH." );
  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:POC/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:"plugin_publication_date", value: "2001/02/09");
 script_set_attribute(attribute:"vuln_publication_date", value: "2001/02/08");
 script_cvs_date("Date: 2018/07/30 15:31:32");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();

 
 script_summary(english:"Checks for the remote SSH version");
 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 2001-2018 Tenable Network Security, Inc.");
 script_family(english:"Misc.");
 script_dependencie("ssh_detect.nasl");
 script_require_ports("Services/ssh", 22);
 exit(0);
}

#
# The script code starts here
#
include("backport.inc");

port = get_kb_item("Services/ssh");
if(!port)port = 22;


banner = get_kb_item("SSH/banner/" + port );
if ( ! banner ) exit(0);

banner = tolower(get_backport_banner(banner:banner));

if("openssh" >< banner)
{
 if(ereg(pattern:"ssh-.*-openssh(-|_)((1\..*)|2\.[0-2]([^0-9]|$))",
	 string:banner))security_hole(port);
}
else
{
if(ereg(pattern:"ssh-.*-1\.2\.(2[4-9]|3[01])([^0-9]|$)", string:banner))
	security_hole(port);
}