CVE-2023-20198 is a critical privilege escalation vulnerability affecting the Cisco IOS XE Web UI. It has been assigned a CVSS score of 10.0, indicating the severity of the risk that organizations face. This vulnerability allows remote, unauthenticated attackers to create accounts with privilege level 15, potentially compromising the affected device entirely. Organizations utilizing Cisco IOS XE should prioritize addressing this vulnerability to prevent unauthorized access.
The exploitation of this vulnerability has been observed in the wild, with attackers leveraging it to gain initial access. Following the creation of a local user account, attackers can escalate their privileges to root, enabling them to write malicious implants to the file system. The urgency for defenders cannot be overstated, as this vulnerability poses a significant risk to network integrity and device security.
Organizations should act swiftly as Cisco has identified this vulnerability as part of an ongoing investigation. Patching and remediation efforts should be a top priority to mitigate the threat posed by this critical vulnerability.
The investigation has also revealed connections to another vulnerability, CVE-2023-20273, which further emphasizes the need for comprehensive security measures. Security teams must ensure that their systems are updated to the latest versions and are compliant with security standards.
Vulnerability Details
Cisco has described this vulnerability as one that allows attackers to exploit the web UI feature of the Cisco IOS XE Software. The vulnerability exists due to improper access controls, leading to potential unintended access levels. The configuration of the affected software allows a remote attacker to create accounts with elevated privileges, making this a serious security threat.
The vulnerability has a CVSS score of 10.0, classified as critical. This high score reflects the potential impact on confidentiality, integrity, and availability, as attackers can gain complete control over affected devices.
The affected products include various Cisco IOS XE versions that are exposed to the internet. Specifically, versions prior to 16.12.10a, 17.3.8a, 17.6.6a, and 17.9.4a are vulnerable. Organizations must review their deployments to identify and remediate any affected instances.
This vulnerability is classified under CWE-420, which denotes the issues related to improper access control. Organizations must take this into account while assessing their security posture.
Technical Analysis
The root cause of CVE-2023-20198 is attributed to improper access controls within the Cisco IOS XE Web UI. Attackers exploit this vulnerability through the network, taking advantage of the low complexity of the attack. Notably, no privileges or user interactions are required for the attack to succeed, which significantly amplifies the risk.
The potential impacts of this vulnerability are severe, with high confidentiality, integrity, and availability impacts. If successfully exploited, attackers can gain full control over affected devices, leading to unauthorized access and manipulation of sensitive information.
Risk & Impact Analysis
Risk to organizations includes significant exposure to unauthorized access and control over critical network infrastructure. The potential for data breaches and service disruptions is substantial, emphasizing the need for immediate remediation. The vulnerability has been actively exploited, and its critical nature necessitates that organizations prioritize patching immediately.
Organizations should consider the blast radius of this vulnerability, as it could affect a wide range of devices within their networks. The urgency for action is further underscored by the fact that this vulnerability is included in the Known Exploited Vulnerabilities catalog, which amplifies the risk of targeted attacks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The following versions of Cisco IOS XE are affected by this vulnerability: Version ranges include: - 16.12 to 16.12.10a (exclusive) - 17.3 to 17.3.8a (exclusive) - 17.6 to 17.6.6a (exclusive) - 17.9 to 17.9.4a (exclusive)
Mitigation & Remediation
To mitigate this vulnerability, organizations must apply the latest patches released by Cisco. It is crucial to verify that instances of Cisco IOS XE Web UI comply with BOD 23-02. For systems exposed to the internet or untrusted networks, organizations should follow vendor instructions to determine if a system may have been compromised and report any positive findings to CISA.
Penetration testing should be considered to assess the security of affected systems and identify any potential weaknesses.
Detection Guidance
Organizations should monitor logs for indicators of compromise such as unusual account creations and access attempts to the web UI. Behavioral anomalies should be investigated promptly. Network signatures related to exploit attempts should be captured, and system changes should be flagged for review.
AppSecure Threat Intelligence Insight
This vulnerability highlights the growing trend of remote exploitation of web interfaces in network devices. Security teams must remain vigilant and adopt proactive measures to secure their environments against similar vulnerabilities. The lessons learned from this incident emphasize the importance of regular updates, compliance with security standards, and continuous monitoring.
For more insights on how to strengthen your security posture, consider exploring our resources on vulnerability management and penetration testing methodology to better prepare for future threats.
In conclusion, organizations should prioritize addressing CVE-2023-20198 and implement comprehensive strategies to mitigate risks associated with critical vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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