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.
References
Link | 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 |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2021-01-22T17:10:19
Updated: 2021-06-04T15:46:03
Reserved: 2020-12-22T00:00:00
Link: CVE-2021-21259
JSON object: View
NVD Information
Status : Analyzed
Published: 2021-01-22T17:15:12.867
Modified: 2021-06-08T14:36:18.190
Link: CVE-2021-21259
JSON object: View
Redhat Information
No data.
CWE