CVE-2021-21259
"HedgeDoc JavaScript Injection Vulnerability"
Description
HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. As a workaround, disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content.
INFO
Published Date :
Jan. 22, 2021, 5:15 p.m.
Last Modified :
June 8, 2021, 2:36 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.0
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-2021-21259.
| URL | Resource |
|---|---|
| https://github.com/hackmdio/codimd/issues/1648 | Exploit Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2 | Release Notes Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw | 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-2021-21259 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21259 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 -
Modified Analysis by [email protected]
Jun. 08, 2021
Action Type Old Value New Value Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Changed Reference Type https://github.com/hackmdio/codimd/issues/1648 No Types Assigned https://github.com/hackmdio/codimd/issues/1648 Exploit, Patch, Third Party Advisory -
CVE Modified by [email protected]
Jun. 04, 2021
Action Type Old Value New Value Changed Description HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. ### Workarounds Disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content. ### References This issue was discovered by @TobiasHoll and reported to hackmdio/codimd: https://github.com/hackmdio/codimd/issues/1648 ### For more information If you have any questions or comments about this advisory: * Open an topic on our community forum * Join our matrix room HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. As a workaround, disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content. Added Reference https://github.com/hackmdio/codimd/issues/1648 [No Types Assigned] -
Initial Analysis by [email protected]
Feb. 01, 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:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N Changed Reference Type https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef No Types Assigned https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef Patch, Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2 No Types Assigned https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2 Release Notes, Third Party Advisory Changed Reference Type https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw No Types Assigned https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* versions up to (excluding) 1.7.2 -
CVE Modified by [email protected]
Jan. 26, 2021
Action Type Old Value New Value Changed Description HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. ### Workarounds Disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content. ### References This issue was discovered by @TobiasHoll and reported to hackmdio/codimd: https://github.com/hackmdio/codimd/issues/1648 ### For more information If you have any questions or comments about this advisory: * Open an topic on our community forum * Join our matrix room HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. ### Workarounds Disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content. ### References This issue was discovered by @TobiasHoll and reported to hackmdio/codimd: https://github.com/hackmdio/codimd/issues/1648 ### For more information If you have any questions or comments about this advisory: * Open an topic on our community forum * Join our matrix room
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21259 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-2021-21259
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.10 }} 0.01%
score
0.40660
percentile