Tuesday , April 1 2025
Artica Proxy

Unpatched PHP Deserialization Vulnerability in Artica Proxy

SonicWall Capture Labs found a vulnerability with the Artica Proxy appliance. This vulnerability affects over 100K servers globally. Artica Proxy is a proxy solution that performs tasks like web filtering, SSL inspection, and bandwidth management. SonicWall has developed measures to mitigate the vulnerability.

There is a security vulnerability called CVE-2024-2054 in the administrative web interface. It allows users to execute code without authentication, which can lead to the execution of code under the “www-data” user account. The severity score is 9.8. This affects version 4.50 and earlier versions. Although there are currently no reports of active attacks, there is a publicly available proof of concept provided by the Korelogic research team.

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The vendor has not released a patch yet. Organizations are strongly advised to follow the steps in the mitigation section below. SonicWall customers are already protected with IPS signature 19786, released on March 18th.

Technical Overview:

An unauthenticated user can send an HTTP POST request to the “/wizard/wiz.wizard.progress.php” endpoint with the “build-js” query parameter.

             Figure 1: wiz.wizard.progress.php lines 10-16

During the “build-js” user input processing, it decodes the base64 value and sends it to the “unserialize” PHP function. This is depicted in Figure 2.

          Figure 2: wiz.wizard.progress.php buld.js function

 

This is the root cause of the vulnerability, as an unauthenticated attacker can control the base64 encoded input which is then directly deserialized.

Triggering the Vulnerability:

To exploit this vulnerability, an attacker needs to send an HTTP POST request to the Artica Proxy instance with the manipulated “build-js” parameter set to a base64-encoded payload. The public PoC code demonstrates this using the Linux “curl” command as shown in Figure 3.

                  Figure 3: Triggering the vulnerability using curl

to read the full report click here.

 

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