CVE-2021-41258
Kirby Image Block Unescaped HTML XSS vulnerable to Cross-Site Scripting Attacks
Description
Kirby is an open source file structured CMS. In affected versions Kirby's blocks field stores structured data for each block. This data is then used in block snippets to convert the blocks to HTML for use in your templates. We recommend to escape HTML special characters to protect against cross-site scripting (XSS) attacks. The default snippet for the image block unfortunately did not use our escaping helper. This made it possible to include malicious HTML code in the source, alt and link fields of the image block, which would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site. Attackers must be in your group of authenticated Panel users in order to exploit this weakness. Users who do not make use of the blocks field are not affected. This issue has been patched in Kirby version 3.5.8 by escaping special HTML characters in the output from the default image block snippet. Please update to this or a later version to fix the vulnerability.
INFO
Published Date :
Nov. 16, 2021, 6:15 p.m.
Last Modified :
Nov. 18, 2021, 5:27 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
2.1
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-2021-41258.
| URL | Resource |
|---|---|
| https://github.com/getkirby/kirby/pull/3510 | Patch Third Party Advisory |
| https://github.com/getkirby/kirby/releases/tag/3.5.8 | Release Notes Third Party Advisory |
| https://github.com/getkirby/kirby/security/advisories/GHSA-cq58-r77c-5jjw | 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-2021-41258 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41258 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]
Nov. 18, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:H/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/getkirby/kirby/pull/3510 No Types Assigned https://github.com/getkirby/kirby/pull/3510 Patch, Third Party Advisory Changed Reference Type https://github.com/getkirby/kirby/releases/tag/3.5.8 No Types Assigned https://github.com/getkirby/kirby/releases/tag/3.5.8 Release Notes, Third Party Advisory Changed Reference Type https://github.com/getkirby/kirby/security/advisories/GHSA-cq58-r77c-5jjw No Types Assigned https://github.com/getkirby/kirby/security/advisories/GHSA-cq58-r77c-5jjw Third Party Advisory Added CWE NIST CWE-79 Added CPE Configuration OR *cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (including) 3.5.7.1
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-41258 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-2021-41258
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
0.23651
percentile