Nmap mysql-vuln-cve2012-2122 NSE Script


This page contains detailed information about how to use the mysql-vuln-cve2012-2122 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/mysql-vuln-cve2012-2122.nse
Script categories: discovery, intrusive, vuln
Target service / protocol: mysql
Target network port(s): 3306
List of CVEs: CVE-2012-2122

Script Description

The mysql-vuln-cve2012-2122.nse script attempts to bypass authentication in MySQL and MariaDB servers by exploiting CVE2012-2122. If its vulnerable, it will also attempt to dump the MySQL usernames and password hashes.

All MariaDB and MySQL versions up to 5.1.61, 5.2.11, 5.3.5, 5.5.22 are vulnerable but exploitation depends on whether memcmp() returns an arbitrary integer outside of -128..127 range.

"When a user connects to MariaDB/MySQL, a token (SHA over a password and a random scramble string) is calculated and compared with the expected value. Because of incorrect casting, it might've happened that the token and the expected value were considered equal, even if the memcmp() returned a non-zero value. In this case MySQL/MariaDB would think that the password is correct, even while it is not. Because the protocol uses random strings, the probability of hitting this bug is about 1/256. Which means, if one knows a user name to connect (and "root" almost always exists), she can connect using *any* password by repeating connection attempts. ~300 attempts takes only a fraction of second, so basically account password protection is as good as nonexistent."

Original public advisory:

Interesting post about this vuln:

Mysql-vuln-cve2012-2122 NSE Script Arguments

This is a full list of arguments supported by the mysql-vuln-cve2012-2122.nse script:

mysql-vuln-cve2012-2122.iterations

Connection retries. Default: 1500.

mysql-vuln-cve2012-2122.pass

MySQL password. Default: nmapFTW.

mysql-vuln-cve2012-2122.socket_timeout

Socket timeout. Default: 5s.

mysql-vuln-cve2012-2122.user

MySQL username. Default: root.

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.

- - -
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=mysql-vuln-cve2012-2122 --script-args mysql-vuln-cve2012-2122.iterations=value,mysql-vuln-cve2012-2122.pass=value <target>

Mysql-vuln-cve2012-2122 NSE Script Example Usage

Here's an example of how to use the mysql-vuln-cve2012-2122.nse script:

nmap -p3306 --script mysql-vuln-cve2012-2122 <target>

nmap -sV --script mysql-vuln-cve2012-2122 <target>

Mysql-vuln-cve2012-2122 NSE Script Example Output

Here's a sample output from the mysql-vuln-cve2012-2122.nse script:

PORT     STATE SERVICE REASON
3306/tcp open  mysql   syn-ack
| mysql-vuln-cve2012-2122:
|   VULNERABLE:
|   Authentication bypass in MySQL servers.
|     State: VULNERABLE
|     IDs:  CVE:CVE-2012-2122
|     Description:
|       When a user connects to MariaDB/MySQL, a token (SHA
|       over a password and a random scramble string) is calculated and compared
|       with the expected value. Because of incorrect casting, it might've
|       happened that the token and the expected value were considered equal,
|       even if the memcmp() returned a non-zero value. In this case
|       MySQL/MariaDB would think that the password is correct, even while it is
|       not.  Because the protocol uses random strings, the probability of
|       hitting this bug is about 1/256.
|       Which means, if one knows a user name to connect (and "root" almost
|       always exists), she can connect using *any* password by repeating
|       connection attempts. ~300 attempts takes only a fraction of second, so
|       basically account password protection is as good as nonexistent.
|
|     Disclosure date: 2012-06-9
|     Extra information:
|       Server granted access at iteration #204
|     root:*9CFBBC772F3F6C106020035386DA5BBBF1249A11
|     debian-sys-maint:*BDA9386EE35F7F326239844C185B01E3912749BF
|     phpmyadmin:*9CFBBC772F3F6C106020035386DA5BBBF1249A11
|     References:
|       https://community.rapid7.com/community/metasploit/blog/2012/06/11/cve-2012-2122-a-tragically-comedic-security-flaw-in-mysql
|       http://seclists.org/oss-sec/2012/q2/493
|_      http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2122

Mysql-vuln-cve2012-2122 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

References

See Also

Related NSE scripts to the mysql-vuln-cve2012-2122.nse script:

Visit Nmap NSE Library for more scripts.

Version

This page has been created based on Nmap version 7.92.