Trusting HTTP Permission Methods on the Server Side Affecting gevent package, versions [,23.9.0)
Threat Intelligence
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-PYTHON-GEVENT-5906371
- published20 Sept 2023
- disclosed20 Sept 2023
- creditmukeran, Jianjun Chen
Introduced: 20 Sep 2023
CVE-2023-41419 (opens in a new tab)How to fix?
Upgrade gevent to version 23.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Trusting HTTP Permission Methods on the Server Side when the gevent.pywsgi function is used. An attacker can craft invalid trailers in chunked requests on keep-alive connections that might appear as two requests to gevent.pywsgi. This could potentially bypass checks if an upstream server is filtering incoming requests based on paths or header fields and simply passing trailers through without validating them. An attacker could escalate privileges on the system via a crafted script to the WSGIServer component.
Note:
If the upstream server validated that the trailers meet the HTTP specification, this could not occur, because characters that are required in an HTTP request, like a space, are not allowed in trailers.