Multiple vulnerabilities in Zyxel NBG6604

Published: 2022-01-03

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-35034 CVE-2021-35035
CWE-ID	CWE-613 CWE-312
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	NBG6604 Hardware solutions / Firmware
Vendor

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Insufficient Session Expiration

EUVDB-ID: #VU59130

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35034

CWE-ID: CWE-613 - Insufficient Session Expiration

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient session expiration issue in the CGI program. A remote non-authenticated attacker can obtain or guess session token and gain unauthorized access to session that belongs to another user.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NBG6604: before 1.00(ABIR.9)C0

External links

http://www.zyxel.com/support/Zyxel_security_advisory_for_sensitive_information_vulnerabilities_of_NBG6604_home_router.shtml

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Cleartext storage of sensitive information

EUVDB-ID: #VU59132

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35035

CWE-ID: CWE-312 - Cleartext Storage of Sensitive Information