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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.67% probability · 89th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-502
- Affected
- sagemcom/f\@st 5280 router firmware
- Source
- cve@mitre.org
References
- http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2020/Sep/3Mailing List, Third Party Advisory
- https://seclists.org/fulldisclosure/2020/Sep/3Mailing List, Third Party Advisory
- https://support.sagemcom.com/fr/haut-debitVendor Advisory
- http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2020/Sep/3Mailing List, Third Party Advisory
- https://seclists.org/fulldisclosure/2020/Sep/3Mailing List, Third Party Advisory
- https://support.sagemcom.com/fr/haut-debitVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.