Description
scponly does not properly verify the path when finding the (1) scp or (2) sftp-server programs, which could allow remote authenticated users to bypass access controls by uploading malicious programs and modifying the PATH variable in $HOME/.ssh/environment to locate those programs.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- SCPOnly 2.3/2.4 - SSH Environment Shell Escaping EDB-21732 · local · Aug 20, 2002 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- http://www.sublimation.org/scponly/
- scponly-ssh-env-upload(9913) vdb-entry
- 20020820 vulnerabilities in scponly mailing-list
- 5526 vdb-entry