In Cisco's Small Business 220 Series smart switches a researcher has uncovered various vulnerabilities, especially those with high severity assessments. This Monday, the networking giant advised its consumers that patches for these vulnerabilities are available. 

The impact switch runs firmware versions earlier than 1.2.0.6 and has the web-based management interface enabled. 

Cisco Systems, Inc. is a US conglomerate based in San Jose, California, in the Silicon Valley center. Cisco designs manufacture and distribute high-tech services and products for networking hardware, software, telecommunications equipment, and others. 

Security researcher Jasper Lievisse Adriaanse has identified the vulnerabilities. He discovered four kinds of safety holes on the small enterprise switch as published in a notice by Cisco. 

One can be used by a remote, unverified attacker, tracked as CVE-2021-1542, which is rated as high severity to take over the user session and obtain access to the web portal of a switch. The attacker could acquire managerial access to the management interface, based on the rights of the potential customer. 

Another high-severity problem is CVE-2021-1541, which enables a remote device attacker with admin access to perform arbitrary root-privileged commands on the operating system underneath it. 

The two other weaknesses identified by the investigator, both of which were Cisco's medium severity, might allow a remote attacker to initiate XSS (CVE-2021-1543) or HTML injection attacks (CVE-2021-1571). 

“[In the case of the] XSS flaw, the vector which I tested and verified was by exploiting a vulnerability in how certain packets which are only valid on the same L2 domain are parsed,” Adriaanse explained. 

He added, “It should be possible, if you’re on the same L2 domain, to perform the XSS attack through CVE-2021-1543, obtain the CSRF token and perform arbitrary actions as the logged-in user. As I don’t write a lot of Javascript I didn’t attempt to write a payload to subsequently exploit CVE-2021-1541. Note however that due to lacking Content-Security-Policy headers you can use CVE-2021-1543 to include remote Javascript code. So you’re not limited by the packet size of the abused L2 protocol. I guess with enough experience and determination one could concoct a payload to do anything in the UI.” 

The XSS defect is due to inspections by the web-based management interface of the device being submitted by the user. An attacker could use this error by deceiving the victims into clicking a malicious link and accessing a certain page. The attacker may induce weakness in running arbitrary script code in connection with the affected interface or access sensitive, browser-based information. 

The HTML Injection Vulnerability is caused by faulty parameter checks on affected pages. In order to address certain vulnerabilities, Cisco has published software updates.