CVE-2022-31015

Public Exploit
Uncaught Exception (due to a data race) leads to process termination in Waitress

Description

Waitress is a Web Server Gateway Interface server for Python 2 and 3. Waitress versions 2.1.0 and 2.1.1 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. This issue has been fixed in Waitress 2.1.2 by no longer allowing the WSGI thread to close the socket. Instead, that is always delegated to the main thread. There is no work-around for this issue. However, users using waitress behind a reverse proxy server are less likely to have issues if the reverse proxy always reads the full response.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.10%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: Pylons waitress
Published at:
Updated at:

References

Link Tags
https://github.com/Pylons/waitress/security/advisories/GHSA-f5x9-8jwc-25rw third party advisory
https://github.com/Pylons/waitress/issues/374 patch exploit third party advisory issue tracking
https://github.com/Pylons/waitress/pull/377 patch third party advisory issue tracking
https://github.com/Pylons/waitress/commit/4f6789b035610e0552738cdc4b35ca809a592d48 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2022-31015?
CVE-2022-31015 has been scored as a medium severity vulnerability.
How to fix CVE-2022-31015?
To fix CVE-2022-31015, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-31015 being actively exploited in the wild?
It is possible that CVE-2022-31015 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-31015?
CVE-2022-31015 affects Pylons waitress.
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