Multiple vulnerabilities in the API and in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on an affected device. Cisco Expressway Series includes the Expressway Control (Expressway-C) and the Expressway Edge (Expressway-E) devices. This vulnerability is classified as critical due to its potential impact on confidentiality and integrity. Organizations should prioritize patching immediately.
The CVSS base score for this vulnerability is 9, indicating a critical severity level. The attack vector is network-based, requiring high privileges and minimal user interaction. The potential for file overwriting poses significant risks to organizations, as attackers may exploit this vulnerability to gain unauthorized access to sensitive data. Therefore, immediate action for remediation is essential.
As of the last update, there are no confirmed public exploits for this vulnerability, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog. However, the risk remains high due to the nature of the vulnerabilities and the potential for exploitation by motivated attackers.
Organizations should assess their exposure to this vulnerability and implement patches as soon as they are available. In addition to patching, organizations may consider additional security measures to mitigate potential risks associated with file overwriting vulnerabilities.
Vulnerability Details
This vulnerability allows a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on affected devices. The CVSS score is 9.0, indicating critical severity, which necessitates urgent attention from organizations.
Affected products include Cisco Expressway Series and Cisco TelePresence Video Communication Server, with all versions prior to the vendor's patch vulnerable to exploitation. The vulnerabilities are classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-158 (Inconsistent Interpretation of HTTP Requests).
Technical Analysis
The root cause of these vulnerabilities is related to inadequate input validation in the API and web-based management interface, allowing attackers to manipulate file paths and perform unintended actions. The attack vector is network-based, implying that a malicious actor could exploit the vulnerability from a remote location. The attack complexity is low, as it requires high privileges and no user interaction.
The impact on confidentiality and integrity is high, as successful exploitation could lead to unauthorized access to sensitive files. The availability impact is low, as the vulnerabilities primarily concern file manipulation rather than service interruption. Organizations must be vigilant and monitor for any signs of exploitation.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive information and the integrity of their systems. The blast radius could be significant, especially for organizations using Cisco products in critical operations. Given the critical severity rating and the low attack complexity, organizations should address this vulnerability in priority patch cycles.
The urgency is critical, and organizations should prioritize patching immediately. Failure to address this vulnerability could result in severe consequences, including data breaches and damage to organizational reputation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Cisco Expressway and Cisco TelePresence Video Communication Server prior to version x14.0.7 are vulnerable to these issues. Organizations should ensure that their systems are updated to the latest versions as per vendor recommendations.
Mitigation & Remediation
Organizations should apply the latest patches provided by Cisco for the affected products to mitigate the risks associated with this vulnerability. For detailed patch information, refer to the Cisco advisory. Additionally, implementing access controls and monitoring systems for unusual activities can help further reduce the risk.
Detection Guidance
Organizations should monitor system logs for any unauthorized access attempts or suspicious activities related to file manipulation. Detecting changes in system behavior or unexpected file uploads can be indicative of exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the need for robust security practices, especially in networked environments. Security teams must remain vigilant against potential attack patterns that could exploit similar vulnerabilities in the future. Regular security assessments and employing best practices in vulnerability management can enhance organizational resilience.
For comprehensive security evaluations, organizations can consider utilizing services such as application security assessments and continuous penetration testing to identify and mitigate potential threats proactively.
Lastly, maintaining awareness of emerging threats and staying informed about security best practices is crucial for effective defense against evolving attack vectors.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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