CVE-2021-43843
Slack JSX Blockquote ReDoS Vuln
Description
jsx-slack is a package for building JSON objects for Slack block kit surfaces from JSX. The maintainers found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient tfor protection from a Regular Expression Denial of Service (ReDoS) attack. If an attacker can put a lot of JSX elements into `<blockquote>` tag _with including multibyte characters_, an internal regular expression for escaping characters may consume an excessive amount of computing resources. v4.5.1 passes the test against ASCII characters but misses the case of multibyte characters. jsx-slack v4.5.2 has updated regular expressions for escaping blockquote characters to prevent catastrophic backtracking. It is also including an updated test case to confirm rendering multiple tags in `<blockquote>` with multibyte characters.
INFO
Published Date :
Dec. 20, 2021, 10:15 p.m.
Last Modified :
Aug. 9, 2022, 1:27 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-43843 has a 1 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-2021-43843.
| URL | Resource |
|---|---|
| https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc | Patch Third Party Advisory |
| https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2 | Release Notes Third Party Advisory |
| https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q | Exploit Patch Third Party Advisory |
| https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6 | Exploit Patch 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).
Research CVEs
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-43843 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-43843 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 -
Reanalysis by [email protected]
Aug. 09, 2022
Action Type Old Value New Value Added CWE NIST NVD-CWE-Other -
Initial Analysis by [email protected]
Jan. 03, 2022
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/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc No Types Assigned https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc Patch, Third Party Advisory Changed Reference Type https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2 No Types Assigned https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2 Release Notes, Third Party Advisory Changed Reference Type https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q No Types Assigned https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q Exploit, Patch, Third Party Advisory Changed Reference Type https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6 No Types Assigned https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6 Exploit, Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:jsx-slack_project:jsx-slack:*:*:*:*:*:node.js:*:* versions up to (excluding) 4.5.2
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-43843 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-2021-43843
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.30 }} 0.04%
score
0.69969
percentile