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 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 v3.0 8.8 HIGH
CVSS v2.0 9.0 HIGH

8.8^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

9.0^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:S/C:C/I:C/A:C

Exploitability : 8.0 / Impact : 10.0

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://support.sagemcom.com/fr/haut-debit	Vendor Advisory
https://seclists.org/fulldisclosure/2020/Sep/3	Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2020/Sep/3	Mailing List Third Party Advisory
http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.html	Exploit Third Party Advisory VDB Entry

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Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:sagemcom:f\@st_5280_router_firmware:1.150.61:*:*:*:*:*:*:*

cpe:2.3:h:sagemcom:f\@st_5280_router:-:*:*:*:*:*:*:*

Information

Published : 2020-09-01 11:15

Updated : 2020-09-11 07:36

NVD link : CVE-2020-24034

Mitre link : CVE-2020-24034

JSON object : View

CWE

CWE-502

Deserialization of Untrusted Data

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Products Affected

sagemcom

f\@st_5280_router_firmware
f\@st_5280_router

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