CVE-2023-22913 is a high-severity vulnerability that allows a remote authenticated attacker to execute commands on Zyxel USG FLEX series firmware versions 4.50 through 5.35, and VPN series firmware versions 4.30 through 5.35. This vulnerability allows attackers to modify device configuration data, which can lead to denial-of-service (DoS) conditions on affected devices.
The CVSS score for this vulnerability is 8.1, indicating a high severity level. This score reflects the potential impact of successful exploitation on the confidentiality, integrity, and availability of the affected systems. Organizations must understand that this vulnerability poses a significant risk, as attackers may leverage it to disrupt critical services.
As of now, there are no known exploits in the wild, but the nature of the vulnerability means that it is essential for organizations to prioritize remediation. Organizations should prioritize patching immediately to protect their systems from potential exploitation.
Given the high severity and potential impact of CVE-2023-22913, organizations using affected Zyxel devices should act swiftly to mitigate risks associated with this vulnerability.
Vulnerability Details
This vulnerability allows a post-authentication command injection in the 'account_operator.cgi' CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, and VPN series firmware versions 4.30 through 5.35. The vulnerability exists due to insufficient input validation in the CGI program, which can enable attackers to execute arbitrary commands.
The CVSS score of 8.1 suggests that this vulnerability has a high severity level due to its potential impact on device integrity and availability. The affected products include various Zyxel USG FLEX and VPN firmware versions. The vulnerability was first published on April 24, 2023.
Technical Analysis
The root cause of this vulnerability is insufficient input validation, allowing attackers to inject arbitrary commands after authentication. The attack vector is network-based, meaning that an attacker could exploit this vulnerability remotely. The complexity of the attack is classified as low, as it requires only low privileges and no user interaction.
Once exploited, the attacker could modify configuration data, leading to potential DoS conditions on the device. The vulnerability affects the integrity and availability of the affected devices, posing a significant risk to organizations relying on these systems.
Risk & Impact Analysis
Risk to organizations includes the potential for service disruption and data integrity issues, particularly for those using affected Zyxel devices. The vulnerability's high CVSS score emphasizes the urgency for organizations to address this issue in their patch cycle.
With the availability of this vulnerability, attackers might target devices in various sectors, leading to a broader blast radius if not addressed. Organizations should schedule remediation as part of their immediate security practices.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include the Zyxel USG FLEX series firmware versions 4.50 through 5.35 and VPN series firmware versions 4.30 through 5.35. Organizations using these versions should verify their current firmware and apply patches as necessary.
Mitigation & Remediation
Organizations should prioritize patching immediately to mitigate this vulnerability. Ensure that firmware is upgraded to the latest version that resolves this issue. For environments where immediate patching is not possible, consider implementing network controls to limit access to affected devices.
Continuous penetration testing can also help validate the effectiveness of security measures in place.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unauthorized command executions and any changes to device configurations. Behavioral anomalies in network traffic directed at affected devices should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-22913 is evident in the evolving nature of command injection vulnerabilities. Organizations should remain vigilant about such vulnerabilities and incorporate robust security practices within their development and operational lifecycles.
Penetration testing methodology can help identify and remediate such vulnerabilities before they are exploited.
Security teams need to understand the potential for similar vulnerabilities in other technologies and implement proactive measures to safeguard their environments.
A vulnerability management program is essential for tracking and addressing vulnerabilities in a timely manner.
API penetration testing can also help in identifying weaknesses in web-based applications and services.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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