Vulnerability in Onyaktech Comments Pro Project
CVE-2021-33484
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Onyaktech Comments Pro Project — versions 3.8
Weakness classification (CWE)
References
- twitter.com/onyaktech (Third Party Advisory)
- burninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.html (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33484?
- CVE-2021-33484 is a high-severity vulnerability in Onyaktech Comments Pro Project, classified under Use of Hard-coded Credentials. CVSS score: 7.5/10. Published 2021-09-07.
- How severe is CVE-2021-33484?
- High severity. CVSS v3 base score is 7.5 out of 10.