CVE-2021-21317
BrowserScope uap-core Regular Expression Denial of Service
Description
uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.
INFO
Published Date :
Feb. 16, 2021, 6:15 p.m.
Last Modified :
Nov. 21, 2024, 5:48 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Public PoC/Exploit Available at Github
CVE-2021-21317 has a 5 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2021-21317.
| URL | Resource |
|---|---|
| https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c | Patch |
| https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4 | Third Party Advisory |
| https://www.npmjs.com/package/uap-core | Product Third Party Advisory |
| https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c | Patch |
| https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4 | Third Party Advisory |
| https://www.npmjs.com/package/uap-core | Product Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21317 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-2021-21317
weaknesses.
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).
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JavaScript
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Your search did not match any code However we found 9k pull requests and 4k issues that matched your search query. Alternatively try one of the tips below. Within a repository: repo:github/linguist Across several: repo:github/linguist OR repo:github/fetch Note that we don't currently support regular expressions in the repo or org qualifiers. For m
production plugin
List of RegEx DoS (ReDoS) CVEs and resources
security awesome redos regex dos regex-dos pentesting awesome-list regex-security
A list of CVE's with Proof of Concepts
JavaScript HTML Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21317 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21317 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 af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c Added Reference https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4 Added Reference https://www.npmjs.com/package/uap-core -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Feb. 08, 2024
Action Type Old Value New Value Changed Reference Type https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c Patch, Third Party Advisory https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c Patch Added CWE NIST CWE-1333 -
Initial Analysis by [email protected]
Feb. 26, 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:L Changed Reference Type https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c No Types Assigned https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c Patch, Third Party Advisory Changed Reference Type https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4 No Types Assigned https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4 Third Party Advisory Changed Reference Type https://www.npmjs.com/package/uap-core No Types Assigned https://www.npmjs.com/package/uap-core Product, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:uap-core_project:uap-core:*:*:*:*:*:node.js:*:* versions up to (excluding) 0.11.0
Vulnerability Scoring Details
Base CVSS Score: 5.3
Base CVSS Score: 5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.48 }} -9.70%
score
0.79213
percentile