CVE-2021-23342 : This affects the package docsify before 4.12.0. It is possible to bypass the rem

This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters

Published 2021-02-19 17:15:14

Updated 2021-02-25 22:22:18

Source Snyk

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2021-23342

Docsifyjs » Docsify
Versions before (<) 4.12.0
cpe:2.3:a:docsifyjs:docsify:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-23342

EPSS FAQ

0.19%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 56 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-23342

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None
8.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L	3.9	4.7	Snyk
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: Low Availability: Low

CWE ids for CVE-2021-23342

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-23342

https://snyk.io/vuln/SNYK-JS-DOCSIFY-1066017

Cross-site Scripting (XSS) in docsify | Snyk
Exploit;Third Party Advisory
https://github.com/docsifyjs/docsify/commit/ff2a66f12752471277fe81a64ad6c4b2c08111fe

fix: isExternal check with malformed URL + tests (#1510) · docsifyjs/docsify@ff2a66f · GitHub
Patch;Third Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/71

Full Disclosure: [KIS-2021-02] docsify <= 4.11.6 DOM-based Cross-Site Scripting Vulnerability
Mailing List;Third Party Advisory

CVEs referencing this url
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1076593

Cross-site Scripting (XSS) in org.webjars.npm:docsify | Snyk
Exploit;Third Party Advisory
http://packetstormsecurity.com/files/161495/docsify-4.11.6-Cross-Site-Scripting.html

docsify 4.11.6 Cross Site Scripting ≈ Packet Storm
Exploit;Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2021-23342

Products affected by CVE-2021-23342

Exploit prediction scoring system (EPSS) score for CVE-2021-23342

CVSS scores for CVE-2021-23342

CWE ids for CVE-2021-23342

References for CVE-2021-23342