CVE-2020-26287
CVSS V2 Medium 4.3
CVSS V3 High 8.7
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.
Overview
- CVE ID
- CVE-2020-26287
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2020-12-29T00:15:12
- Last Modified Date
- 2020-12-30T16:50:07
Weakness Enumerations
CPE Configuration (Product)
CPE | Vulnerable | Operator | Version Start | Version End |
---|---|---|---|---|
cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* | 1 | OR | 1.7.1 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4.3
- Severity
- MEDIUM
- Exploitability Score
- 8.6
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 8.7
- Base Severity
- HIGH
- Exploitability Score
- 2.3
- Impact Score
- 5.8
References
Reference URL | Reference Tags |
---|---|
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 |
Sources
Source Name | Source URL |
---|---|
NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-26287 |
MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26287 |
History
Created | Old Value | New Value | Data Type | Notes |
---|---|---|---|---|
2022-05-10 07:29:07 | Added to TrackCVE | |||
2022-12-05 18:56:12 | 2020-12-29T00:15Z | 2020-12-29T00:15:12 | CVE Published Date | updated |
2022-12-05 18:56:12 | 2020-12-30T16:50:07 | CVE Modified Date | updated | |
2022-12-05 18:56:12 | Analyzed | Vulnerability Status | updated |