Nmap smtp-vuln-cve2011-1720 NSE Script


This page contains detailed information about how to use the smtp-vuln-cve2011-1720 NSE script. For list of all NSE scripts, visit the Nmap NSE Library.

Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/smtp-vuln-cve2011-1720.nse
Script categories: intrusive, vuln
Target service / protocol: smtp, smtps, submission
Target network port(s): 25, 465, 587
List of CVEs: CVE-2011-1720

Script Description

The smtp-vuln-cve2011-1720.nse script checks for a memory corruption in the Postfix SMTP server when it uses Cyrus SASL library authentication mechanisms (CVE-2011-1720). This vulnerability can allow denial of service and possibly remote code execution.

Reference:

Smtp-vuln-cve2011-1720 NSE Script Arguments

This is a full list of arguments supported by the smtp-vuln-cve2011-1720.nse script:

smbdomain

The domain to log in with. If you aren't in a domain environment, then anything will (should?) be accepted by the server.

smbhash

A password hash to use when logging in. This is given as a single hex string (32 characters) or a pair of hex strings (both 32 characters, optionally separated by a single character). These hashes are the LanMan or NTLM hash of the user's password, and are stored on disk or in memory. They can be retrieved from memory using the fgdump or pwdump tools.

smbnoguest

Use to disable usage of the 'guest' account.

smbpassword

The password to connect with. Be cautious with this, since some servers will lock accounts if the incorrect password is given. Although it's rare that the Administrator account can be locked out, in the off chance that it can, you could get yourself in trouble. To use a blank password, leave this parameter off altogether.

smbtype

The type of SMB authentication to use. These are the possible options:

  • v1: Sends LMv1 and NTLMv1.
  • LMv1: Sends LMv1 only.
  • NTLMv1: Sends NTLMv1 only (default).
  • v2: Sends LMv2 and NTLMv2.
  • LMv2: Sends LMv2 only.
  • NTLMv2: Doesn't exist; the protocol doesn't support NTLMv2 alone. The default, NTLMv1, is a pretty decent compromise between security and compatibility. If you are paranoid, you might want to use v2 or lmv2 for this. (Actually, if you're paranoid, you should be avoiding this protocol altogether!). If you're using an extremely old system, you might need to set this to v1 or lm, which are less secure but more compatible. For information, see smbauth.lua.

smbusername

The SMB username to log in with. The forms "DOMAIN\username" and "username@DOMAIN" are not understood. To set a domain, use the smbdomain argument.

smtp.domain

The domain to be returned by get_domain, overriding the target's own domain name.

vulns.short

If set, vulnerabilities will be output in short format, a single line consisting of the host's target name or IP, the state, and either the CVE ID or the title of the vulnerability. Does not affect XML output.

vulns.showall

If set, the library will show and report all the registered vulnerabilities which includes the NOT VULNERABLE ones. By default the library will only report the VULNERABLE entries: VULNERABLE, LIKELY VULNERABLE, VULNERABLE (DoS) and VULNERABLE (Exploitable). This argument affects the following functions: vulns.Report.make_output(): the default output function for portule/hostrule scripts. vulns.make_output(): the default output function for postrule scripts. vulns.format_vuln() and vulns.format_vuln_table() functions.

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To use these script arguments, add them to the Nmap command line using the --script-args arg1=value,[arg2=value,..] syntax. For example:

nmap --script=smtp-vuln-cve2011-1720 --script-args smbdomain=value,smbhash=value <target>

Smtp-vuln-cve2011-1720 NSE Script Example Usage

Here's an example of how to use the smtp-vuln-cve2011-1720.nse script:

nmap --script=smtp-vuln-cve2011-1720 --script-args='smtp.domain=<domain>' -pT:25,465,587 <host>

Smtp-vuln-cve2011-1720 NSE Script Example Output

Here's a sample output from the smtp-vuln-cve2011-1720.nse script:

PORT   STATE SERVICE
25/tcp open  smtp
| smtp-vuln-cve2011-1720:
|   VULNERABLE:
|   Postfix SMTP server Cyrus SASL Memory Corruption
|     State: VULNERABLE
|     IDs:  CVE:CVE-2011-1720  BID:47778
|     Description:
|       The Postfix SMTP server is vulnerable to a memory corruption vulnerability
|       when the Cyrus SASL library is used with authentication mechanisms other
|       than PLAIN and LOGIN.
|     Disclosure date: 2011-05-08
|     Check results:
|       AUTH tests: CRAM-MD5 NTLM
|     Extra information:
|       Available AUTH MECHANISMS:  CRAM-MD5 DIGEST-MD5 NTLM PLAIN LOGIN
|     References:
|       http://www.postfix.org/CVE-2011-1720.html
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1720
|_      https://www.securityfocus.com/bid/47778

Smtp-vuln-cve2011-1720 NSE Script Example XML Output

There is no sample XML output for this module. However, by providing the -oX <file> option, Nmap will produce a XML output and save it in the file.xml file.

Author

  • Djalal Harouni

References

See Also

Related NSE scripts to the smtp-vuln-cve2011-1720.nse script:

Visit Nmap NSE Library for more scripts.

Version

This page has been created based on Nmap version 7.92.