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Home > Cybersecurity > Cisco patches SSH authentication mechanism vulnerability

Cisco patches SSH authentication mechanism vulnerability

Cisco announced the release of a patch to address a vulnerability in the key-based SSH authentication mechanism of Cisco Umbrella Virtual Appliance.


Erdem Yasar Erdem Yasar
April 25, 2022
1 min read
Cisco patches SSH authentication mechanism vulnerability

Cisco patched a vulnerability in the key-based SSH authentication mechanism of Cisco Umbrella Virtual Appliance. The vulnerability could allow a remote attacker to impersonate VA. The vulnerability, tracked as CVE-2022-20773, is due to the presence of a static SSH host key. The vulnerability can be exploited with a man-in-the-middle attack on an SSH connection to the Umbrella VA.

CVSS score of 7.5

When it is successfully exploited, the vulnerability allows an attacker to learn the administrator credentials, change configurations, or reload the VA. There are no workarounds for this vulnerability and Cisco urges users to apply the patch as soon as possible.

This vulnerability affects the Cisco Umbrella Virtual Appliance for both VMWare ESXi and Hyper-V running a software version earlier than 3.3.2. SSH is not enabled by default but to check ifi t is enabled, users can visit hypervisor console, enter configuration mode by pressing CTRL+B, and enter the command config va show. If SSH is enabled, output of the config va show command will look like this:

 ~ $ config va show

            Virtual Appliance Configuration

                Name:

                Local DNS -

                    ip address :

                    DNSSEC : disabled

                Internal Domains Count: 0

                Resolvers: 208.67.220.220 208.67.222.222

                SSH access : enabled

See more Cybersecurity News


Tags: Cisco SystemsVulnerability
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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