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Home > Cybersecurity > Cisco warns users about a zero-day vulnerability

Cisco warns users about a zero-day vulnerability

Cisco released updates that address a vulnerability in the health check RPM of Cisco IOS XR Software which is currently under attack.

Erdem Yasar by Erdem Yasar
May 23, 2022
in Cybersecurity
2 min read
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Cisco warns users about a zero-day vulnerability
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Cisco published a security advisory informing users that there is a software update available that addresses a vulnerability found in the health check RPM of Cisco IOS XR Software. The vulnerability, tracked as CVE-2022-20821, allows an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. The attacker can not execute remote code or abuse the integrity of the host system, thus the vulnerability has a CVSS score of 6.5.

Health check RPM

Cisco stated that the flaw exists because the health check RPM opens TCP port 6379 by default upon activation. By exploiting the vulnerability by connecting to the Redis instance on the open port an attacker can write to the Redis in-memory database, write arbitrary files to the container filesystem, and retrieve information about the Redis database. Cisco stated that there are also workarounds available to address the vulnerability.

Cisco IOS XR Release First Fixed Release
7.2 and earlier Not affected
7.3.15, 7.3.16, 7.3.1, and 7.3.2 Not affected
7.3.3 7.3.4
7.4 Not affected
7.5.1 Not affected
7.5.2 Not affected
7.6 Not affected

The vulnerability affects Cisco 8000 Series Routers if they were running a vulnerable release of Cisco IOS XR Software and had the health check RPM installed and active. Users can issue the “run docker ps” CLI command to determine if the device is in a vulnerable state. If the output returns a docker container with the name NOSi, the device is considered vulnerable.

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Tags: Cisco Systems
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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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