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

2022-05-3122:50:12

CWE-248

CWE-362

GitHub_M

www.cve.org

waitress

web server gateway interface

python

data race

process termination

cve-2022-31015

vulnerability

thread

socket

application kill

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.002

Percentile

56.7%

JSON

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.

CNA Affected

[
  {
    "product": "waitress",
    "vendor": "Pylons",
    "versions": [
      {
        "status": "affected",
        "version": ">= 2.1.0, < 2.1.2"
      }
    ]
  }
]