CVE-2021-34704 is a high-severity vulnerability affecting Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software. This vulnerability allows an unauthenticated remote attacker to trigger a denial of service (DoS) condition due to improper input validation when parsing HTTPS requests. A successful exploit could lead to the affected device reloading, thus causing a denial of service that disrupts network operations.
The CVSS score of 8.6, classified as high severity, indicates significant potential impact on the availability of affected systems. Organizations running these Cisco products should take immediate action to address this vulnerability. The risk to organizations includes possible downtime and the potential for significant disruption to services, which can affect business continuity.
Currently, there are no known public exploits or proof-of-concept (PoC) available for this vulnerability. However, given its high score and the nature of the vulnerability, organizations should prioritize patching immediately. Failure to do so may expose critical network infrastructure to potential threats.
The urgency for defenders is underscored by the potential for unauthorized access and service disruption, emphasizing the need for timely remediation.
Vulnerability Details
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
The CVSS score is 8.6, indicating high severity. The vulnerability affects multiple versions of the Cisco ASA and FTD software, specifically versions prior to vendor patches. The issue is classified under CWE-121 (Stack-based Buffer Overflow) and CWE-787 (Out-of-bounds Write), highlighting the improper handling of inputs.
Technical Analysis
The root cause of CVE-2021-34704 stems from improper input validation in the web services interface of Cisco ASA and FTD software. The attack vector is network-based, requiring no authentication. The attack complexity is low, and there is no user interaction required for successful exploitation. Given the nature of the vulnerability, the impact on availability is high, as it could lead to a complete device reload, resulting in a denial of service.
The confidentiality and integrity impacts are assessed as none, indicating that the vulnerability does not expose sensitive data or alter data integrity. However, the availability impact is substantial, making it critical for organizations to address.
Risk & Impact Analysis
Real-world deployment of Cisco ASA and FTD software in critical infrastructure and enterprise networks means that the risk associated with CVE-2021-34704 is significant. Organizations using these products could face service disruptions that impact business operations and customer satisfaction. The blast radius potential is extensive, affecting all devices running the vulnerable software versions.
Organizations should prioritize patching immediately due to the high CVSS score and the potential for denial of service. The impact of an exploit could lead to significant downtime and operational challenges.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include Cisco Firepower Threat Defense versions up to 7.0.0 and Cisco Adaptive Security Appliance Software versions from 9.15 to prior to 9.15.1.17 and from 9.16 to prior to 9.16.2. Organizations should ensure that they upgrade to the latest patched versions to mitigate the risk.
Mitigation & Remediation
Organizations should prioritize immediate patching of affected Cisco products. Details for patches can be found in the Cisco advisory. Ensure that all devices are updated to the latest versions to mitigate vulnerabilities. If patches are unavailable, implement network controls to restrict access to these devices and monitor for any suspicious activity.
Detection Guidance
Monitor logs for indications of unusual HTTPS requests that could indicate attempts to exploit this vulnerability. Look for patterns consistent with denial of service attacks and ensure that any anomalies are investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-34704 lies in its potential to disrupt services for organizations relying on Cisco ASA and FTD Software. This incident highlights the importance of rigorous input validation in web services. Security teams are encouraged to adopt proactive measures, including continuous security assessments and regular updates to their systems, to mitigate similar risks in the future.
Security teams should consider implementing a comprehensive vulnerability management program that includes regular vulnerability assessments and penetration testing. For further guidance on vulnerability management, organizations can explore best practices in the context of penetration testing.
Organizations can explore best practices in the context of vulnerability management.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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