Cross-site scripting in Sagemcom F@ST 3686



Published: 2020-09-16
Risk Low
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2020-21733
CWE ID CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
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F@st 3686
Hardware solutions / Routers for home users

Vendor Sagemcom

Security Advisory

This security advisory describes one low risk vulnerability.

1) Cross-site scripting

Risk: Low

CVSSv3: 5.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2020-21733

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the "RgDiagnostics.asp", "RgDdns.asp", "RgFirewallEL.asp" and "RgVpnL2tpPptp.asp" fields. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

F@st 3686: 3.97.0

CPE External links

http://sagemcom.com
http://sagemcomfst3686v10hun3970.com
https://github.com/Gr3gPr1est/BugReport/blob/master/CVE-2020-21733
https://github.com/Gr3gPr1est/BugReport/blob/master/SAGEM_F%40ST3686_v1.0_HUN_3.97.0_XSS_Vuln..pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.