Vulnerability identifier: #VU48778

Vulnerability risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-29390

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zeroshell
Web applications / Other software

Vendor: ZeroShell

Description

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

The vulnerability exists due to improper input validation in "StartSessionSubmitL" parameter in "/cgi-bin/kerbynet". A remote unauthenticated attacker can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

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

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Zeroshell: 3.9.3

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External links
http://blog.quake.so/post/zeroshell_linux_router_rce/

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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.