Vulnerability · Published Sep 1, 2020 · Assigned by mitre
CVE-2020-24034
High 8.8
In plain English
A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.7% (higher than 90% of all known vulnerabilities).
Official 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.
Affected products (as reported)
References
- https://support.sagemcom.com/fr/haut-debit x_refsource_MISC
- https://seclists.org/fulldisclosure/2020/Sep/3 x_refsource_MISC
- 20200901 Sagemcom router insecure deserialization > privilege escalation mailing-list, x_refsource_FULLDISC
- http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.html x_refsource_MISC