CVE-2022-31015: Uncaught Exception (due to a data race) leads to process termination in Waitress
First published: Tue May 31 2022(Updated: )
### Impact Waitress may terminate early due to a thread closing a socket while the main thread is about to call select(). This will lead to the main thread raising an exception that is not handled and then causing the entire application to be killed. ### Patches This issue has been fixed in Waitress 2.1.2 by no longer allowing the WSGI thread to close the socket, instead it is always delegated to the main thread. ### Workarounds There is no work-around, however users using waitress behind a reverse proxy server are less likely to have issues if the reverse proxy always reads the full response. ### For more information If you have any questions or comments about this advisory: * Open an issue in https://github.com/Pylons/waitress/issues (if not sensitive or security related) * email the Pylons Security mailing list: [pylons-project-security@googlegroups.com](mailto:pylons-project-security@googlegroups.com) (if security related)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Agendaless Waitress | >=2.1.0<2.1.2 | |
| pip/waitress | >=2.1.0<2.1.2 | 2.1.2 |
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Reference Links
- https://github.com/Pylons/waitress/commit/4f6789b035610e0552738cdc4b35ca809a592d48
- https://github.com/Pylons/waitress/issues/374
- https://github.com/Pylons/waitress/pull/377
- https://github.com/Pylons/waitress/security/advisories/GHSA-f5x9-8jwc-25rw
- https://nvd.nist.gov/vuln/detail/CVE-2022-31015
- https://github.com/pypa/advisory-database/tree/main/vulns/waitress/PYSEC-2022-205.yaml
- https://github.com/advisories/GHSA-f5x9-8jwc-25rw (Advisory)
Frequently Asked Questions
What is CVE-2022-31015?
CVE-2022-31015 is a vulnerability in Waitress, a Web Server Gateway Interface server for Python 2 and 3.
What is the severity of CVE-2022-31015?
CVE-2022-31015 has a severity rating of medium (5.9).
How does CVE-2022-31015 affect Waitress?
CVE-2022-31015 affects Waitress versions 2.1.0 to 2.1.2.
What is the impact of CVE-2022-31015?
CVE-2022-31015 can lead to the main thread raising an unhandled exception and causing the server to terminate early.
How can I fix CVE-2022-31015?
To fix CVE-2022-31015, it is recommended to update to Waitress version 2.1.3 or later.
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