Insufficient Entropy in ZyXEL Communications Corp. products - CVE-2022-34746

Vulnerability identifier: #VU67632

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-34746

CWE-ID: CWE-331

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper use of randomness sources with low entropy for RSA key pair generation. A remote attacker can retrieve a private key.

GS1900-8
GS1900-8HP
GS1900-16
GS1900-24E
GS1900-24
GS1900-48
GS1900-10HP
GS1900-24EP
GS1900-24HPv2
GS1900-48HPv2

Install updates from vendor's website.

GS1900-8 - update to 2.70(AAHH.3)C0
GS1900-8HP - update to 2.70(AAHI.3)C0
GS1900-16 - update to 2.70(AAHJ.3)C0
GS1900-24E - update to 2.70(AAHK.3)C0
GS1900-24 - update to 2.70(AAHL.3)C0
GS1900-48 - update to 2.70(AAHN.3)C0
GS1900-10HP - update to 2.70(AAZI.3)C0
GS1900-24EP - update to 2.70(ABTO.3)C0
GS1900-24HPv2 - update to 2.70(ABTP.3)C0
GS1900-48HPv2 - update to 2.70(ABTQ.3)C0

• https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-insufficient-entropy-vulnerability-of-gs1900-series-switches

• Insufficient Entropy in Zyxel GS1900 series switches