Insufficient Entropy in Zyxel GS1900 series switches

1) Insufficient Entropy

EUVDB-ID: #VU67632

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-34746

CWE-ID: CWE-331 - Insufficient Entropy

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GS1900-8: 2.60(AAHH.4)C0

GS1900-8HP: 2.60(AAHI.4)C0

GS1900-10HP: 2.60(AAZI.4)C0

GS1900-16: 2.60(AAHJ.4)C0

GS1900-24: 2.60(AAHL.4)C0

GS1900-24E: 2.60(AAHK.4)C0

GS1900-24EP: 2.60(ABTO.4)C0

GS1900-24HPv2: 2.60(ABTP.4)C0

GS1900-48: 2.60(AAHN.4)C0

GS1900-48HPv2: 2.60(ABTQ.4)C0

External links

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

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.