Overview
CVE-2025-8267 is a high-severity vulnerability affecting versions of the ssrfcheck package before 1.2.0. This cybersecurity flaw enables Server-Side Request Forgery (SSRF) attacks due to an incomplete denylist of IP address ranges. It particularly concerns the failure to classify the reserved IP address space 224.0.0.0/4 (Multicast) as invalid. This vulnerability is significant as it potentially allows attackers to compromise systems or leak sensitive data. It is crucial for all users of the affected versions to take immediate mitigation steps to secure their cyber environment.
Vulnerability Summary
CVE ID: CVE-2025-8267
Severity: High (CVSS: 8.2)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
ssrfcheck | Before 1.2.0
How the Exploit Works
The exploit works by taking advantage of the package’s failure to identify the reserved IP address space 224.0.0.0/4 (Multicast) as invalid. Attackers can craft malicious server-side requests targeting these multicast addresses, prompting the server to unknowingly send requests to untrusted sites. This could potentially lead to system compromise or data leakage, depending on the attacker’s intent and the server’s configuration.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. In this scenario, the attacker sends a POST request to the vulnerable endpoint with a payload specifying a multicast IP within the non-denylisted range.
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "url": "http://224.0.0.1" }In this example, the server would follow the request to the specified multicast address, potentially leading to undesired outcomes such as information disclosure or system compromise.
Mitigation Guidance
To mitigate this vulnerability, users of the ssrfcheck package should update to version 1.2.0 or later, which has addressed this vulnerability. As a temporary mitigation, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could provide some level of protection. However, these measures are not a substitute for applying the vendor-provided patch. It is crucial to keep software updated to prevent falling victim to known vulnerabilities and attacks.