#VU74450 OS Command Injection in Sophos Web Appliance (SWA) - CVE-2023-1671

Vulnerability identifier: #VU74450

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-2023-1671

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Sophos Web Appliance (SWA)
Server applications / Server solutions for antivurus protection

Vendor: Sophos

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 the warn-proceed handler. A remote unauthenticated attacker can send specially crafted request to the appliance 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

Sophos Web Appliance (SWA): before 4.3.10.4

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External links
https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rce
https://wsa.sophos.com/docs/ws1000/ws1000/concepts/ReleaseNotes_4.3.10.4.html

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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.