CVE-2020-29583 is a critical vulnerability affecting firmware version 4.60 of various Zyxel USG devices, including the ATP, USG, and VPN models. This vulnerability allows unauthorized access through an undocumented account, known as 'zyfwp,' which has a hard-coded password that cannot be changed. The password is stored in cleartext within the firmware, making it easily exploitable. As a result, an attacker can gain administrative privileges through the SSH server or web interface, leading to severe security implications.
The vulnerability is rated with a CVSS score of 9.8, classifying it as critical. This score reflects the high risk that organizations face if they do not address this flaw immediately. The potential for data loss, unauthorized access, and disruption of services significantly increases the urgency for remediation.
Given the nature of the vulnerability and its critical status in the Known Exploited Vulnerabilities (KEV) catalog, organizations should prioritize patching immediately. The vulnerability was first added to the KEV catalog on November 3, 2021, indicating that it has been recognized as actively exploited in the wild. As such, the urgency for defenders to implement fixes cannot be overstated.
Organizations using affected Zyxel devices should take immediate action by applying the necessary updates and patches as prescribed by the vendor. Failure to do so may expose systems to significant risks, including data breaches and unauthorized access.
Vulnerability Details
According to the official CVE description, the vulnerability involves an undocumented account (zyfwp) with an unchangeable password located in the firmware. This account can be exploited to access the SSH server or web interface with administrative privileges. The CWE classification for this vulnerability is CWE-522, which pertains to the use of hard-coded credentials.
The CVSS score of 9.8 highlights the critical nature of this vulnerability, indicating that it poses a significant risk to confidentiality, integrity, and availability. The attack vector is network-based, and the attack complexity is low, meaning that even attackers with minimal skills can exploit this flaw without requiring user interaction.
Technical Analysis
The root cause of CVE-2020-29583 stems from the inclusion of an undocumented account with a hard-coded password that cannot be changed. This design flaw allows unauthorized users to access sensitive administrative functionalities without any form of authentication required.
The attack vector is network-based, which means that the vulnerability can be exploited remotely over the internet or through any accessible network. Attack complexity is low, as it does not require any special conditions or user interaction for exploitation. The confidentiality, integrity, and availability impacts of this vulnerability are rated high, indicating that successful exploitation could lead to complete control over the affected devices.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive data, disruption of services, and administrative control over network devices. The blast radius of this vulnerability is significant, given that it affects multiple Zyxel products, including firewalls and access point controllers. Organizations utilizing these devices are advised to act swiftly to mitigate risks associated with this vulnerability.
With an EPS score of 0.943670000, this vulnerability ranks in the highest percentile, indicating a near certainty of exploitation in the wild. It is crucial that organizations understand the importance of addressing such vulnerabilities as part of their overall security strategy.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected, specifically targeting firmware version 4.60 across multiple Zyxel products, including but not limited to the USG, ATP, and VPN series.
Mitigation & Remediation
Organizations should apply updates per vendor instructions to mitigate this vulnerability. Zyxel has provided patches that address the use of hard-coded credentials. Regular monitoring and auditing of network devices for unauthorized access attempts is also recommended to enhance security posture.
For additional support, organizations can consider engaging in penetration testing services to identify and rectify potential weaknesses.
Detection Guidance
Organizations should monitor logs for any unauthorized attempts to access the undocumented account. Behavioral anomalies such as unusual login times or IP addresses should also be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2020-29583 highlights the critical need for robust security practices regarding hard-coded credentials. Organizations must recognize the patterns that lead to such vulnerabilities and implement comprehensive security training and audits.
This vulnerability reflects a trend in the industry where inadequate security measures can lead to significant risks. Security teams must learn from this case to avoid similar pitfalls in their environments.
For organizations seeking to enhance their security posture, reviewing resources on penetration testing methodology and engaging in regular security assessments can provide significant benefits.
Developing a culture of security awareness and proactive risk management will be vital in mitigating the impacts of vulnerabilities like CVE-2020-29583.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)