Trustwave SpiderLabs Security Advisory TWSL2013-025: Arbitrary File Upload Vulnerability in Official Nmap Http-domino-enum-passwords NSE script Published: 08/02/13 Version: 1.0 Vendor: Nmap (http://nmap.org/) Product: Nmap NSE script Version affected: Nmap 6.25 Product description: Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts. Nmap runs on all major computer operating systems, and official binary packages are available for Linux, Windows, and Mac OS X. In addition to the classic command-line Nmap executable, the Nmap suite includes an advanced GUI and results viewer (Zenmap), a flexible data transfer, redirection, and debugging tool (Ncat), a utility for comparing scan results (Ndiff), and a packet generation and response analysis tool (Nping). Finding 1: Arbitrary File Upload Vulnerability *****Credit: Piotr Duszynski @drk1wi of Trustwave SpiderLabs CVE: CVE-2013-4885 It is possible to write arbitrary files to a remote system, through a specially crafted server response for NMAP http-domino-enum-passwords.nse script (from the official Nmap repository). Example vulnerable command: nmap --script domino-enum-passwords -p 80 <evil_host> --script-args domino-enum-passwords.username='patrik karlsson',domino-enum-passwords.password=secret,domino-enum-passwords.idpath='/tmp' Vulnerable code: ... local status, err = saveIDFile( ("%s/%s.id"):format(download_path, u_details.fullname), http_response.body ) ... This issue can be only exploited if the 'domino-enum-passwords.idpath' parameter is present. In order to bypass the second format string parameter "%s.id" and be able to write arbitrary files to the operating system the following payload should be appended to the first format string parameter value: "\x00\x61\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x25\x64\x0d\x0a" Fully functional exploit for this vulnerability is available in the Portspoof git repository. Remediation Steps: The vendor has released an official patch for this vulnerability. It is recommended to upgrade to Nmap 6.40. Revision History: 07/18/13 - Vulnerability disclosed to vendor 07/29/13 - Patch released by vendor 08/02/13 - Advisory published References 1. http://nmap.org/changelog.html About Trustwave: Trustwave is the leading provider of on-demand and subscription-based information security and payment card industry compliance management solutions to businesses and government entities throughout the world. For organizations faced with today's challenging data security and compliance environment, Trustwave provides a unique approach with comprehensive solutions that include its flagship TrustKeeper compliance management software and other proprietary security solutions. Trustwave has helped thousands of organizations--ranging from Fortune 500 businesses and large financial institutions to small and medium-sized retailers--manage compliance and secure their network infrastructure, data communications and critical information assets. Trustwave is headquartered in Chicago with offices throughout North America, South America, Europe, Africa, China and Australia. For more information, visit https://www.trustwave.com About Trustwave SpiderLabs: SpiderLabs(R) is the advanced security team at Trustwave focused on application security, incident response, penetration testing, physical security and security research. The team has performed over a thousand incident investigations, thousands of penetration tests and hundreds of application security tests globally. In addition, the SpiderLabs Research team provides intelligence through bleeding-edge research and proof of concept tool development to enhance Trustwave's products and services. https://www.trustwave.com/spiderlabs Disclaimer: The information provided in this advisory is provided "as is" without warranty of any kind. Trustwave disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. 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