CVE-2022-20899 : Exploit Details and Defense Strategies

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV Series Routers could allow an authenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition. Here's what you need to know about CVE-2022-20899.

Understanding CVE-2022-20899

CVE-2022-20899 involves multiple vulnerabilities in Cisco Small Business RV Series Routers that could be exploited by attackers to execute arbitrary code or trigger a DoS condition.

What is CVE-2022-20899?

The vulnerabilities in the web-based management interface of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers stem from insufficient validation of user fields within incoming HTTP packets. An attacker with valid Administrator credentials could exploit these flaws to execute commands with root-level privileges or cause the device to restart unexpectedly.

The Impact of CVE-2022-20899

If successfully exploited, an attacker could execute arbitrary commands with elevated privileges on the affected device or disrupt its operation by causing unexpected restarts, leading to a DoS situation. These vulnerabilities pose a medium-severity risk with a CVSS base score of 4.7.

Technical Details of CVE-2022-20899

Here are the technical specifics of CVE-2022-20899:

Vulnerability Description

The vulnerabilities are a result of insufficient validation of user fields within incoming HTTP packets, allowing attackers to craft requests that execute arbitrary code or trigger a DoS condition.

Affected Systems and Versions

Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers are affected by these vulnerabilities, with no specific versions mentioned.

Exploitation Mechanism

Attackers can exploit these vulnerabilities by sending a crafted request to the web-based management interface, requiring valid Administrator credentials for successful exploitation.

Mitigation and Prevention

To mitigate the risks associated with CVE-2022-20899, consider the following measures:

Immediate Steps to Take

Cisco has not released software updates to address these vulnerabilities yet. Monitor for official patches and advisories from the vendor.

Long-Term Security Practices

Limit network access to the web-based management interface to trusted users only.
Implement strong password policies and regularly update Administrator credentials.

Patching and Updates

Stay informed about security updates and advisories provided by Cisco for the affected router models.