GitHub Advisoryadvisory · Go
GHSA-2hfj-cxw7-g45p Unsafe inline XSS in pasting DOM element into chat
HIGH
Official page ↗
- Aliases
- CVE-2021-39183
- Ecosystem
- Go
- Packages
- github.com/owncast/owncast
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:L
- Weaknesses
- CWE-79
- Reviewed
- 2021-12-14
Affected packages
• Go github.com/owncast/owncast: < 0.0.9 → fixed in 0.0.9
Description
Impact
Inline scripts are executed when Javascript is parsed via a paste action.
1. Open https://watch.owncast.online/
2. Copy and then paste `` into the
chat field.
3. An alert should pop up.
Patches
```
⋮ 13 │ // Content security policy
⋮ 14 │ csp := []string{
⋮ 15 │ "script-src 'self' 'sha256-2HPCfJIJHnY0NrRDPTOdC7AOSJIcQyNxzUuut3TsYRY='",
⋮ 16 │ "worker-src 'self' blob:", // No single quotes around blob:
⋮ 17 │ }
```
Will be patched in 0.0.9 by blocking `unsafe-inline` Content Security Policy and specifying the `script-src`. The `worker-src` is required to be set to `blob` for the video player.
For more information
If you have any questions or comments about this advisory:
• Open an issue in owncast/owncast
• Email us at [email protected]
Related
Alias · CVE (1)
- CVE-2021-39183 Owncast is an open source, self-hosted live video streaming and chat server. vulnerability
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness