CVE-2020-24034 — HIGH (8.8)

Vulnerability 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 Score

8.8

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Sagemcom	F\@St 5280 Router Firmware	1.150.61
Sagemcom	F\@St 5280 Router	-

Related Weaknesses (CWE)

CWE-502

References

http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-EscalatExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2020/Sep/3Mailing ListThird Party Advisory
https://seclists.org/fulldisclosure/2020/Sep/3Mailing ListThird Party Advisory
https://support.sagemcom.com/fr/haut-debitVendor Advisory
http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-EscalatExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2020/Sep/3Mailing ListThird Party Advisory
https://seclists.org/fulldisclosure/2020/Sep/3Mailing ListThird Party Advisory
https://support.sagemcom.com/fr/haut-debitVendor Advisory

FAQ

What is CVE-2020-24034?

CVE-2020-24034 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 wit...

How severe is CVE-2020-24034?

CVE-2020-24034 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-24034?

Check the references section above for vendor advisories and patch information. Affected products include: Sagemcom F\@St 5280 Router Firmware, Sagemcom F\@St 5280 Router.