CVE-2021-43856
Wiki.js Stored Cross-Site Scripting
Description
Wiki.js is a wiki app built on Node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through non-image file uploads for file types that can be viewed directly inline in the browser. By creating a malicious file which can execute inline JS when viewed in the browser (e.g. XML files), a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the file is viewed directly by other users. The file must be opened directly by the user and will not trigger directly in a normal Wiki.js page. A patch in version 2.5.264 fixes this vulnerability by adding an optional (enabled by default) force download flag to all non-image file types, preventing the file from being viewed inline in the browser. As a workaround, disable file upload for all non-trusted users. --- Thanks to @Haxatron for reporting this vulnerability. Initially reported via https://huntr.dev/bounties/266bff09-00d9-43ca-a4bb-bb540642811f/
INFO
Published Date :
Dec. 27, 2021, 6:15 p.m.
Last Modified :
Jan. 7, 2022, 7:11 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.7
Exploitability Score :
2.8
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-2021-43856.
| URL | Resource |
|---|---|
| https://github.com/Requarks/wiki/commit/79bdd4409316adf649806de3e22352297f85cee0 | Patch Third Party Advisory |
| https://github.com/Requarks/wiki/releases/tag/2.5.264 | Release Notes Third Party Advisory |
| https://github.com/Requarks/wiki/security/advisories/GHSA-rhpf-929m-7fm2 | 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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-43856 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-43856 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 -
Initial Analysis by [email protected]
Jan. 07, 2022
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Changed Reference Type https://github.com/Requarks/wiki/commit/79bdd4409316adf649806de3e22352297f85cee0 No Types Assigned https://github.com/Requarks/wiki/commit/79bdd4409316adf649806de3e22352297f85cee0 Patch, Third Party Advisory Changed Reference Type https://github.com/Requarks/wiki/releases/tag/2.5.264 No Types Assigned https://github.com/Requarks/wiki/releases/tag/2.5.264 Release Notes, Third Party Advisory Changed Reference Type https://github.com/Requarks/wiki/security/advisories/GHSA-rhpf-929m-7fm2 No Types Assigned https://github.com/Requarks/wiki/security/advisories/GHSA-rhpf-929m-7fm2 Exploit, Patch, Third Party Advisory Added CWE NIST CWE-79 Added CPE Configuration OR *cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.264 -
CVE Modified by [email protected]
Dec. 27, 2021
Action Type Old Value New Value Changed Description Wiki.js is a wiki app built on Node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through non-image file uploads for file types that can be viewed directly inline in the browser. By creating a malicious file which can execute inline JS when viewed in the browser (e.g. XML files), a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the file is viewed directly by other users. The file must be opened directly by the user and will not trigger directly in a normal Wiki.js page. A patch in version 2.5.264 fixes this vulnerability by adding an optional (enabled by default) force download flag to all non-image file types, preventing the file from being viewed inline in the browser. As a workaround, disable file upload for all non-trusted users. --- Thanks to @Haxatron for reporting this vulnerability. Initially reported via https://huntr.dev/bounties/266bff09-00d9-43ca-a4bb-bb540642811f/ Wiki.js is a wiki app built on Node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through non-image file uploads for file types that can be viewed directly inline in the browser. By creating a malicious file which can execute inline JS when viewed in the browser (e.g. XML files), a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the file is viewed directly by other users. The file must be opened directly by the user and will not trigger directly in a normal Wiki.js page. A patch in version 2.5.264 fixes this vulnerability by adding an optional (enabled by default) force download flag to all non-image file types, preventing the file from being viewed inline in the browser. As a workaround, disable file upload for all non-trusted users. --- Thanks to @Haxatron for reporting this vulnerability. Initially reported via https://huntr.dev/bounties/266bff09-00d9-43ca-a4bb-bb540642811f/
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-43856 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-2021-43856
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.00%
score
0.24475
percentile