#VU17336 OS Command Injection in rssh - CVE-2019-1000018

Vulnerability identifier: #VU17336

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2019-1000018

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
rssh
Server applications / Remote management servers, RDP, SSH

Vendor: rssh.sourceforge.net

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper validation in the scp support. A remote unauthenticated attacker can perform only scp, sftp, cvs, svnserve (Subversion), rdist and/or rsync operations and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

rssh: All versions

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External links
https://esnet-security.github.io/vulnerabilities/20190115_rssh.html
https://sourceforge.net/p/rssh/mailman/message/36520091/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.