SB2022062916 - Multiple vulnerabilities in nats-server

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper access control (CVE-ID: CVE-2020-26892)

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to improper access restrictions in JWT library in NATS nats-server when handling expired credentials. A remote attacker can send a specially crafted request, gain unauthorized access and execute arbitrary code on the system.

2) NULL pointer dereference (CVE-ID: CVE-2020-26521)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in JWT library in NATS nats-server. A remote attacker can pass specially crafted data and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://www.openwall.com/lists/oss-security/2020/11/02/2
• https://github.com/advisories/GHSA-4w5x-x539-ppf5
• http://www.openwall.com/lists/oss-security/2020/11/02/2
• https://github.com/advisories/GHSA-h2fg-54x9-5qhq