CVE Vulnerability

CVE-2021-43843

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 `
` 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 `
` with multibyte characters.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6 Exploit Patch
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
Configurations

Configuration 1

cpe:2.3:a:jsx-slack_project:jsx-slack:*:*:*:*:*:node.js:*:*
Information

Published : 2021-12-20 10:15

Updated : 2022-08-09 01:27

NVD link : CVE-2021-43843

Mitre link : CVE-2021-43843

Products Affected
No products.
CWE
NVD-CWE-Other