Zero-day vulnerability in Cisco IOS XR

Improper access control
CVE-2022-20821

Vulnerability details

Advisory: SB2022052101 - Improper access restrictions in Cisco IOS XR

Vulnerable component: Cisco IOS XR

CVE-ID: CVE-2022-20821

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C

CWE-ID: CWE-284 - Improper Access Control

Description:

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

The vulnerability exists due to unrestricted access to the Redis instance running within the NOSi container, accessible via port 6379/tcp (the health check RPM opens this port by default). A remote non-authenticated attacker can connect to the Redis instance and obtain sensitive information or modify it.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-redis-ABJyE5xK

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.