Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Onyaktech Comments Pro Project | Onyaktech Comments Pro | 3.8 |
Related Weaknesses (CWE)
References
- https://burninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.htmlExploitThird Party Advisory
- https://twitter.com/onyaktechThird Party Advisory
- https://burninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.htmlExploitThird Party Advisory
- https://twitter.com/onyaktechThird Party Advisory
FAQ
What is CVE-2021-33484?
CVE-2021-33484 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2021-33484?
CVE-2021-33484 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-33484?
Check the references section above for vendor advisories and patch information. Affected products include: Onyaktech Comments Pro Project Onyaktech Comments Pro.