Multiple vulnerabilities in Zyxel NBG6604



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
 NBG6604
Hardware solutions / Firmware

Vendor ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Insufficient Session Expiration

EUVDB-ID: #VU59130

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

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

CPE2.3 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

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-35035

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

Exploit availability: No

Description

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

The vulnerability exists due to the storage of sensitive information in plain-text within the configuration file. A remote authenticated attacker can retrieve sensitive information stored in cleartext.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NBG6604: before 1.00(ABIR.9)C0

CPE2.3 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 authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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



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