Executive Summary

This vulnerability exists in Craft Commerce versions 4.0.0 through 4.10.2 and 5.0.0 through 5.5.4, specifically in the Commerce TotalRevenue widget. It is an SQL injection vulnerability that allows any authenticated control panel user to execute remote code on the server.

The attack works by exploiting unsanitized widget settings that are interpolated into SQL expressions. Because PDO's default multi-statement query support is enabled, an attacker can inject a maliciously serialized PHP object into the queue table.

When the queue consumer processes this injected job, an unrestricted unserialize() call in yii2-queue triggers a gadget chain in GuzzleHttp's FileCookieJar. This chain's destructor method writes a PHP webshell to the server's webroot.

The entire exploitation requires only three HTTP requests, no administrative privileges, and results in arbitrary command execution as the PHP process user. Queue processing is triggered via an unauthenticated endpoint.

This vulnerability has been fixed in versions 4.10.3 and 5.5.5.

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Impact Analysis

This vulnerability can have severe impacts including allowing an attacker to execute arbitrary commands on the server hosting the Craft Commerce platform.

Since the exploit results in remote code execution with the privileges of the PHP process user, an attacker could potentially take full control of the server environment, access sensitive data, modify or delete files, and deploy malicious payloads such as webshells.

The attack requires only an authenticated control panel user and no administrative privileges, making it easier for attackers with limited access to escalate their control.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Craft Commerce to version 4.10.3 or later, or 5.5.5 or later, where the issue has been fixed.

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