Overview
The Common Vulnerabilities and Exposures (CVE) system has identified a significant vulnerability, CVE-2024-33452, within OpenResty’s lua-nginx-module prior to version 0.10.26. This vulnerability can enable an attacker to smuggle HTTP requests, potentially compromising systems or leading to data leakage. It is of particular relevance to organizations using affected versions of this module in their web applications.
Vulnerability Summary
CVE ID: CVE-2024-33452
Severity: High (CVSS: 7.7)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
OpenResty lua-nginx-module | Before 0.10.26
How the Exploit Works
A remote attacker could exploit this vulnerability by sending a specially crafted HEAD request to the server running the affected software. This can cause the server to misinterpret the boundaries of HTTP requests and responses, a technique known as HTTP Request Smuggling. By doing so, the attacker can inject malicious content or commands, potentially leading to unauthorized access or data leakage.
Conceptual Example Code
An example of a malicious HEAD request might look something like this:
HEAD /target HTTP/1.1
Host: vulnerable.example.com
Content-Length: 50
Transfer-Encoding: chunked
0
GET /internal_data HTTP/1.1
Host: vulnerable.example.comThis example demonstrates a typical HTTP request smuggling attack in which the attacker’s second (smuggled) request is appended to the first request.
Mitigation
Users of the affected lua-nginx-module are advised to apply the vendor’s patch immediately to mitigate this vulnerability. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation by detecting and blocking malicious HEAD requests.
