CVE-2022-31015

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.

How to fix CVE-2022-31015

To remediate CVE-2022-31015, upgrade the affected package to a fixed version below.

• —upgrade to 2.1.2-1 or later
• —upgrade to 2.1.2 or later
• —upgrade to 4f6789b035610e0552738cdc4b35ca809a592d48 or later

Is CVE-2022-31015 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 2.1.2-1
• >= 2.1.0, < 2.1.2
• from 0, < 4f6789b035610e0552738cdc4b35ca809a592d48 | >= 2.1.0, < 2.1.2

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2022-31015
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-31015
• PATCHgithub.com/Pylons/waitress
• WEBgithub.com/Pylons/waitress/commit/4f6789b035610e0552738cdc4b35ca809a592d48
• WEB