Time-of-check Time-of-use (TOCTOU) Race Condition Affecting waitress package, versions [2.0.0,3.0.1)
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-WAITRESS-8309636
- published29 Oct 2024
- disclosed29 Oct 2024
- creditm4yfly, urn1ce
Introduced: 29 Oct 2024
CVE-2024-49768 (opens in a new tab)How to fix?
Upgrade waitress to version 3.0.1 or higher.
Overview
waitress is a production-quality pure-Python WSGI server with very acceptable performance.
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition in HTTP pipelining when handling an invalid initial request. An attacker can exploit this vulnerability to process unauthorized requests by sending a specially crafted sequence of requests where the first request is exactly recv_bytes long and followed by a secondary request using HTTP pipelining.
Workaround
This vulnerability can be mitigated by disabling channel_request_lookahead, which is set to 0 by default, thus disabling this feature.