CVE-2020-24034 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8