CVE-2021-32837
Mechanize ReDoS Attacks Crashes Web Server
Description
mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.
INFO
Published Date :
Jan. 17, 2023, 10:15 p.m.
Last Modified :
June 20, 2023, 5:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32837.
| URL | Resource |
|---|---|
| https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879 | Exploit Third Party Advisory |
| https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 | Patch Third Party Advisory |
| https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6 | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html | |
| https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/ | Exploit Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-32837 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32837 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Jun. 20, 2023
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html [No Types Assigned] -
Initial Analysis by [email protected]
Jan. 25, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879 No Types Assigned https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879 Exploit, Third Party Advisory Changed Reference Type https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 No Types Assigned https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 Patch, Third Party Advisory Changed Reference Type https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6 No Types Assigned https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6 Third Party Advisory Changed Reference Type https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/ No Types Assigned https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/ Exploit, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:mechanize_project:mechanize:*:*:*:*:*:python:*:* versions up to (excluding) 0.4.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32837 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32837
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.27 }} 0.04%
score
0.68338
percentile