CVE-2025-9100
BaseFortify
Publication date: 2025-08-18
Last updated on: 2025-09-03
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| zhenfeng13 | my-blog | 1.0 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-294 | A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). |
| CWE-287 | When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-9100 is a vulnerability in the frontend blog article comment functionality of zhenfeng13 My-Blog 1.0.0. It involves a CAPTCHA reuse issue where the verification code does not refresh after use, allowing attackers to reuse the same CAPTCHA multiple times. This enables attackers to submit many comments by replaying the authentication data, effectively bypassing security controls without valid credentials. The flaw is due to improper handling of inputs in the comment authentication process, leading to an authentication bypass by capture-replay attack that can be initiated remotely. [1, 3]
How can this vulnerability impact me? :
This vulnerability can allow attackers to bypass authentication and submit a large volume of comments using the same CAPTCHA, potentially leading to exhaustion of database resources due to excessive submissions. This can degrade system performance, cause denial of service, and compromise the integrity of the comment system by allowing unauthorized or spam comments to be posted. [1, 2, 3]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by monitoring for repeated use of the same CAPTCHA token in requests to the /blog/comment endpoint, indicating a replay attack. Network or application logs should be analyzed for multiple comment submissions using identical CAPTCHA values. Additionally, inspecting HTTP traffic for repeated POST requests to /blog/comment with the same CAPTCHA parameter can help identify exploitation attempts. Specific commands depend on your environment, but examples include using tools like tcpdump or Wireshark to capture traffic, and grep or jq to filter logs. For example, using grep on web server logs: grep '/blog/comment' access.log | grep 'captcha_token=XYZ' to find repeated use of the same CAPTCHA token. [1, 3]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include disabling or restricting access to the /blog/comment functionality until a patch or fix is available. Implementing server-side CAPTCHA regeneration after each use to prevent reuse is critical. Additionally, monitoring and rate-limiting comment submissions can reduce the impact of automated replay attacks. If possible, replace the affected software with an alternative solution as no known patches exist currently. Applying web application firewall (WAF) rules to detect and block repeated CAPTCHA reuse attempts can also help mitigate exploitation. [1, 3]