#VU19316 OS Command Injection in Zeroshell - CVE-2019-12725

Vulnerability identifier: #VU19316

Vulnerability risk: Critical

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:Red]

CVE-ID: CVE-2019-12725

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: Yes

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 the some parameters inside a script are used without a properly sanitization. A remote unauthenticated attacker can inject OS commands inside the vulnerable parameters and execute arbitrary OS commands on the target system.

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

/cgi-bin/kerbynet?Section=NoAuthREQ&Action=x509view&User=Admin&x509type='%0Auname -a%0A'
/cgi-bin/kerbynet?Action=x509view&Section=NoAuthREQ&User=&x509type='%0A/etc/sudo tar -cf /dev/null /dev/null --checkpoint=1 --checkpoint-action=exec=id%0A'

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

Vulnerable software versions

Zeroshell: 3.9.0

External links
https://www.tarlogic.com/advisories/zeroshell-rce-root.txt

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.