CVE-2022-38547 is a high-severity vulnerability identified in the CLI command of several Zyxel firmware versions, including ZyWALL/USG series, VPN series, USG FLEX series, and ATP series. The vulnerability allows an authenticated attacker with administrator privileges to execute OS commands, posing significant risks to organizations utilizing the affected products.
With a CVSS score of 7.2, the vulnerability is classified as high severity. The post-authentication command injection vulnerability could allow attackers to gain control of the system, potentially leading to unauthorized data access or system compromise. The risk to organizations includes exposure of sensitive systems and data integrity issues.
Currently, there are no known exploits available in the wild for this vulnerability. However, the publication of the CVE should prompt organizations to prioritize remediation efforts as a precautionary measure.
Organizations utilizing Zyxel products should address this vulnerability immediately to mitigate risks. Applying patches and updates as soon as they are available is crucial to maintaining security.
Vulnerability Details
The vulnerability, described as a post-authentication command injection, affects several firmware versions from Zyxel. It is important to note that the vulnerability is classified under CWE-78, indicating a command injection vulnerability.
The following are the affected firmware versions: Zyxel ZyWALL/USG series firmware versions 4.20 through 4.72, VPN series firmware versions 4.30 through 5.32, USG FLEX series firmware versions 4.50 through 5.32, and ATP series firmware versions 4.32 through 5.32.
The vulnerability was published on February 7, 2023, and is considered modified as of November 21, 2024.
Technical Analysis
The root cause of this vulnerability stems from improper validation of user input within the command line interface (CLI) of the affected devices. Attackers may exploit this flaw by sending crafted commands post-authentication, leveraging their administrator privileges to execute arbitrary OS commands.
The attack vector is classified as network-based, with low complexity and high privileges required for successful exploitation. Importantly, no user interaction is necessary to exploit this vulnerability.
Exploitation of this vulnerability can lead to significant impacts across confidentiality, integrity, and availability, as attackers could manipulate system operations or access sensitive data.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2022-38547 is considerable. Organizations that deploy the affected Zyxel devices must recognize the potential blast radius of an attack, which could include unauthorized access to sensitive data, operational disruption, and compliance violations.
Organizations should address this vulnerability in their priority patch cycle, given its high CVSS score and the nature of the attack vector. The risk to organizations includes exposure of confidential data and potential system integrity issues.
With an EPSS score of 0.01466, the probability of exploitation in the next 30 days is relatively low. However, the potential impact of a successful exploit necessitates immediate attention.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected firmware versions include the following: Zyxel ZyWALL/USG series firmware versions 4.20 through 4.72, VPN series firmware versions 4.30 through 5.32, USG FLEX series firmware versions 4.50 through 5.32, and ATP series firmware versions 4.32 through 5.32.
Mitigation & Remediation
Organizations should prioritize patching immediately. Updating to the latest firmware versions is crucial to mitigate this vulnerability. Zyxel has provided updates for the affected products, and administrators should apply these updates as soon as possible.
Detection Guidance
Monitoring logs for unusual command activity and validating firmware versions can help organizations detect potential exploitation attempts. Behavioral anomalies and unauthorized command executions should be investigated promptly.
AppSecure Threat Intelligence Insight
CVE-2022-38547 highlights the importance of maintaining up-to-date firmware and security practices in network devices. Security teams should regularly review and update their systems to safeguard against such vulnerabilities. Implementing a penetration testing program can further enhance an organization's security posture.
By understanding the implications of vulnerabilities such as CVE-2022-38547, organizations can proactively manage their security risks and improve their incident response strategies. Continuous education on cybersecurity threats is essential for all members of an organization.
Overall, the discovery of CVE-2022-38547 serves as a reminder of the critical need for robust security measures in today's interconnected environment. Organizations must prioritize security in their operational frameworks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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