CVE-2021-33484

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.16%
Third-Party Advisory blogspot.com Third-Party Advisory twitter.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://twitter.com/onyaktech third party advisory
https://burninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.html third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-33484?
CVE-2021-33484 has been scored as a high severity vulnerability.
How to fix CVE-2021-33484?
To fix CVE-2021-33484, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-33484 being actively exploited in the wild?
It is possible that CVE-2021-33484 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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