#VU77558 OS Command Injection in acme.sh - CVE-2023-38198

Vulnerability identifier: #VU77558

Vulnerability risk: Critical

CVSSv4.0: 9.3 [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:A/U:Red]

CVE-ID: CVE-2023-38198

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
acme.sh
Other software / Other software solutions

Vendor: Neilpang (neil)

Description

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

The vulnerability exists due to improper input validation when parsing certificates. A remote attacker can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Note, exploitation of this vulnerability has been observed in the wild by compromised HiCA servers.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

acme.sh: 1.2.2 - 3.0.5

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External links
https://github.com/acmesh-official/acme.sh/issues/4659
https://github.com/acmesh-official/acme.sh/releases/tag/3.0.6

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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?

Yes. This vulnerability is being exploited in the wild.