CVE-2020-24034 : Exploit Details and Defense Strategies
Learn about CVE-2020-24034, a vulnerability in Sagemcom F@ST 5280 routers allowing privilege escalation. Find out how to mitigate the risk and prevent unauthorized access.
Sagemcom F@ST 5280 routers using firmware version 1.150.61 have an insecure deserialization vulnerability that allows authenticated users to escalate privileges, potentially leading to a complete compromise.
Understanding CVE-2020-24034
This CVE involves a security issue in Sagemcom F@ST 5280 routers that can be exploited by authenticated users to elevate their privileges.
What is CVE-2020-24034?
The vulnerability in Sagemcom F@ST 5280 routers allows any authenticated user to perform a privilege escalation to any other user by manipulating session cookies.
The Impact of CVE-2020-24034
Exploiting this vulnerability enables an attacker to assume the role and permissions of another user, including the ability to flash custom firmware to the router, resulting in a complete compromise.
Technical Details of CVE-2020-24034
This section provides more technical insights into the vulnerability.
Vulnerability Description
The insecure deserialization vulnerability in Sagemcom F@ST 5280 routers allows attackers to alter user values in session cookies, leading to privilege escalation.
Affected Systems and Versions
- Product: Sagemcom F@ST 5280 routers
- Firmware Version: 1.150.61
Exploitation Mechanism
- Attacker needs valid sess_id, nonce, and ha1 values in the serialized session cookie
- By altering the user value in the cookie, the attacker can assume the role and permissions of the specified user
- Gaining access to the internal account allows flashing custom firmware to the router
Mitigation and Prevention
Protecting systems from CVE-2020-24034 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update the firmware of Sagemcom F@ST 5280 routers to a secure version
- Monitor network traffic for any suspicious activities
- Restrict access to sensitive router functionalities
Long-Term Security Practices
- Regularly audit and update router firmware
- Implement strong authentication mechanisms
- Conduct security training for users to recognize and report suspicious activities
Patching and Updates
- Stay informed about security updates from Sagemcom
- Apply patches promptly to address known vulnerabilities