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CVE-2021-33484

7.5 · HIGH

An issue was discovered in CommentsService.ashx in OnyakTech Comments Pro 3.8.

Published Sep 7, 2021CWE-798EPSS 0.89%

Overview

CVE-2021-33484 is a high-severity vulnerability. It was published on September 7, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in CommentsService.ashx in OnyakTech Comments Pro 3.8. An attacker can download a copy of the installer, decompile it, and discover a hardcoded IV used to encrypt the username and userid in the comment POST request. Additionally, the attacker can decrypt the encrypted encryption key (sent as a parameter in the comment form request) by setting this encrypted value as the username, which will appear on the comment page in its decrypted form. Using these two values (combined with the encryption functionality discovered in the decompiled installer), the attacker can encrypt another user's ID and username. These values can be used as part of the comment posting request in order to spoof the user.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refburninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.htmlReftwitter.com/onyaktechRefburninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.htmlReftwitter.com/onyaktech

How CyberStrike helps

Frequently asked questions

What is CVE-2021-33484?

CVE-2021-33484 is a high-severity vulnerability. It was published on September 7, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-33484?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-33484?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-33484?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-33484 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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