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The CVE-2025-XXXX vulnerability in Ruby WEBrick’s `read_headers` method enables HTTP request/response smuggling due to improper parsing of header terminators. Attackers can exploit inconsistencies in how WEBrick processes CRLF (\r\n) sequences, allowing maliciously crafted headers to bypass security checks. When deployed behind misconfigured proxies, this flaw permits smuggling arbitrary HTTP requests, leading to cache poisoning, session hijacking, or unauthorized access. The issue stems from lax validation of header boundaries, enabling attackers to inject hidden requests via malformed headers.
DailyCVE Form:
Platform: Ruby WEBrick
Version: <1.8.0
Vulnerability: HTTP Smuggling
Severity: Moderate
Date: 2025-06-26
Prediction: Patch by 2025-07-10
What Undercode Say:
curl -H "Header: malformed\r\nInjected-Request: GET /admin" http://victim
WEBrick::HTTPRequest.new.parse(StringIO.new("GET / HTTP/1.1\r\nHost: evil\r\n\r\n"))
How Exploit:
- Craft requests with ambiguous `\r\n` sequences.
- Proxy misconfiguration amplifies impact.
Protection from this CVE:
- Update to WEBrick >=1.8.0 (post-patch).
- Reject requests with malformed headers.
Impact:
- Cache poisoning, session hijacking.
- Bypass security controls.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
