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CVE-2022-31015— Uncaught Exception (due to a data race) leads to process termination in Waitress

Quick assessment

Affected
Pylons waitress
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Waitress是一款用于Python的WSGI（Web服务器网关接口）服务器。 Waitress 2.1.0和2.1.1版本存在安全漏洞，该漏洞源于线程在主线程即将调用 select() 时关闭套接字而提前终止。

CVSS 6.5 · Medium EPSS 1.47% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-31015

Vulnerability Information
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Vulnerability Title
Uncaught Exception (due to a data race) leads to process termination in Waitress
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Waitress 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Waitress是一款用于Python的WSGI（Web服务器网关接口）服务器。 Waitress 2.1.0和2.1.1版本存在安全漏洞，该漏洞源于线程在主线程即将调用 select() 时关闭套接字而提前终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Pylons waitress >= 2.1.0, < 2.1.2 -

II. Public POCs for CVE-2022-31015

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III. Intelligence Information for CVE-2022-31015

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Patches & Fixes for CVE-2022-31015 (2)

Vendor Advisories for CVE-2022-31015 (1)

Other References for CVE-2022-31015 (1)

IV. Related Vulnerabilities

Same product: waitress
Same vendor: Pylons
Same weakness: CWE-248

V. Comments for CVE-2022-31015

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