CVE-2020-26287
HedgeDoc LGTM Arbitrary Code Execution Through Mermaid Diagrams
Description
HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist.
INFO
Published Date :
Dec. 29, 2020, 12:15 a.m.
Last Modified :
Nov. 21, 2024, 5:19 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
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-2020-26287.
| URL | Resource |
|---|---|
| https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md | Exploit Third Party Advisory |
| https://github.com/hackmdio/codimd/issues/1630 | Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4 | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1 | Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p | Third Party Advisory |
| https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md | Exploit Third Party Advisory |
| https://github.com/hackmdio/codimd/issues/1630 | Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4 | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1 | Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26287 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-2020-26287
weaknesses.
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-2020-26287 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26287 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 af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md Added Reference https://github.com/hackmdio/codimd/issues/1630 Added Reference https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4 Added Reference https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1 Added Reference https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Dec. 30, 2020
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:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Changed Reference Type https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md No Types Assigned https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md Exploit, Third Party Advisory Changed Reference Type https://github.com/hackmdio/codimd/issues/1630 No Types Assigned https://github.com/hackmdio/codimd/issues/1630 Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4 No Types Assigned https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4 Patch, Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1 No Types Assigned https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1 Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p No Types Assigned https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p Third Party Advisory Added CWE NIST CWE-79 Added CPE Configuration OR *cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* versions up to (excluding) 1.7.1
Vulnerability Scoring Details
Base CVSS Score: 8.7
Base CVSS Score: 4.3
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.54 }} -0.31%
score
0.65136
percentile