cve-2020-26287
Vulnerability from cvelistv5
Published
2020-12-28 23:30
Modified
2024-08-04 15:56
Severity ?
8.7 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.mdExploit, Third Party Advisory
security-advisories@github.comhttps://github.com/hackmdio/codimd/issues/1630Third Party Advisory
security-advisories@github.comhttps://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1Third Party Advisory
security-advisories@github.comhttps://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95pThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.mdExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/hackmdio/codimd/issues/1630Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95pThird Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

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  }
}


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