CVE-2021-40524
Pure-FTPd UnboundedFileSize Vulnerability
Description
In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)
INFO
Published Date :
Sept. 5, 2021, 7:15 p.m.
Last Modified :
Nov. 26, 2021, 7:49 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-2021-40524.
| URL | Resource |
|---|---|
| https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4 | Patch Third Party Advisory |
| https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 | Patch Third Party Advisory |
| https://github.com/jedisct1/pure-ftpd/pull/158 | 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-2021-40524 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-40524 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.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Nov. 26, 2021
Action Type Old Value New Value Changed Reference Type https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4 No Types Assigned https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4 Patch, Third Party Advisory Changed Reference Type https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 No Types Assigned https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 Patch, Third Party Advisory Changed CPE Configuration OR *cpe:2.3:a:pureftpd:pure-ftpd:1.0.49:*:*:*:*:*:*:* OR *cpe:2.3:a:pureftpd:pure-ftpd:*:*:*:*:*:*:*:* versions from (including) 1.0.23 up to (excluding) 1.0.50 -
CVE Modified by [email protected]
Nov. 24, 2021
Action Type Old Value New Value Changed Description In Pure-FTPd 1.0.49, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.) Added Reference https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4 [No Types Assigned] Added Reference https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 [No Types Assigned] -
Initial Analysis by [email protected]
Sep. 10, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P) 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/jedisct1/pure-ftpd/pull/158 No Types Assigned https://github.com/jedisct1/pure-ftpd/pull/158 Exploit, Third Party Advisory Added CWE NIST CWE-434 Added CPE Configuration OR *cpe:2.3:a:pureftpd:pure-ftpd:1.0.49:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-40524 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-2021-40524
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
0.67357
percentile