Understanding CVE-2022-39952: A Zero Trust Access Solution that Failed to Deliver

In the world of enterprise security products, bugs are inevitable, but they should never be taken lightly. CVE-2022-39952 sheds light on the frustrating reality of security products and their lack of robust engineering approaches.

Fortinet FortiNAC, a zero-trust access solution that oversees and protects all digital assets connected to an enterprise network, has been found vulnerable to a serious bug. The vulnerability affects FortiNAC versions 9.4.0, 9.2.0 through 9.2.5, 9.1.0 through 9.1.7, 8.8.0 through 8.8.11, 8.7.0 through 8.7.6, 8.6.0 through 8.6.5, 8.5.0 through 8.5.4, 8.3.7.

The vulnerability allows an unauthenticated attacker to execute unauthorized code or commands via a specifically crafted HTTP request. The issue lies in the keyUpload scriptlet, keyUpload.jsp.

When an HTTP request without authentication comes in, it parses to look for a file in the key parameter. If found, it writes it to /bsc/campusMgr/config.applianceKey. If that write happens, it makes a phone call to Runtime().Exec() which executes a bash script located at /bsc/campusMgr/bin/configApplianceXml.

The exploit for this vulnerability is beautiful, and it is something that once you write, you would do a proper jiggle when it works. However, this bug is a class of bug that is found using a wide range of tools, such as CodeQL, Semgrep, and others.

The understanding of how data travels through your product is critical in ensuring that vulnerabilities like CVE-2022-39952 do not make it to the wild.

Also read: Netcomm and TP-Link Routers at Risk: Critical Security Vulnerabilities Exposed

It is not acceptable for vendors to release products with such vulnerabilities, and it is essential to pressure them to cut this out.

This vulnerability is a reminder that bugs are painful and frustrating, but preventable. The exploit code and write-up by @Horizon3ai are testaments to the importance of responsible disclosure and the need for robust engineering approaches.

In conclusion, CVE-2022-39952 is a fascinating bug that highlights the importance of taking security seriously, especially in enterprise security products.

Enterprises need to ensure that their products undergo proper scrutiny, and vendors must be held accountable for the vulnerabilities in their products. Bugs happen, but they can be prevented.

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