A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.
The CVSS score for this vulnerability is 8.6, classified as high severity, indicating significant potential impact on affected systems. Organizations using Cisco ASA and FTD must understand the real-world implications of this vulnerability, as it could lead to service interruptions and operational challenges if exploited.
Given the exploitability of this vulnerability and its presence in the Known Exploited Vulnerabilities (KEV) catalog, organizations should prioritize patching immediately. The deadline for applying necessary mitigations is set to May 1, 2024.
Risk to organizations includes potential disruption of services due to the denial of service condition, which could have downstream effects on business operations and customer trust.
Vulnerability Details
The vulnerability in question is cataloged as CVE-2024-20353. The root cause is linked to incomplete error checking when processing HTTP headers in Cisco's ASA and FTD software. The issue allows an attacker to trigger an unexpected reload of the device, leading to a DoS condition. The affected versions include various releases of the Cisco Adaptive Security Appliance software and the Firepower Threat Defense software, as detailed in the vendor's advisory.
The vulnerability was published on April 24, 2024, and is classified under CWE-835, which relates to incorrect handling of input. Organizations must remain vigilant regarding the impact of this vulnerability, especially given the high score of 8.6, highlighting its severity.
Technical Analysis
The vulnerability allows an attacker to exploit the affected products over a network, with low attack complexity and no required privileges or user interaction. The impact on availability is significant, as the devices can be made unavailable through denial of service.
This vulnerability highlights the importance of robust input validation and error handling in web server management contexts. Organizations should assess their configurations and implement best practices for web server security to mitigate potential risks.
Risk & Impact Analysis
The risk to organizations includes operational disruption from potential denial of service conditions, which can lead to significant challenges in maintaining service levels and protecting customer trust. The urgency of addressing this vulnerability is underscored by its presence in the KEV catalog, indicating that it is actively being exploited in the wild.
Organizations should consider the blast radius of this vulnerability, as it affects critical infrastructure components. Immediate action is necessary to avoid potential exploitation and mitigate the risks associated with service interruptions.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects several versions of Cisco's Adaptive Security Appliance Software and Firepower Threat Defense. All versions prior to the vendor patch are vulnerable. Organizations should check their systems to ensure they are not running affected versions.
Mitigation & Remediation
Organizations should apply the latest patches provided by Cisco to remediate this vulnerability. For those unable to apply patches immediately, additional mitigations may include limiting access to the management and VPN web servers and monitoring network traffic for unusual patterns.
More information about securing systems can be found through our comprehensive penetration testing services, which can help identify and address vulnerabilities.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual access patterns, particularly around the management and VPN web servers. Behavioral anomalies and unexpected reloads of devices should also be investigated.
AppSecure Threat Intelligence Insight
This vulnerability underscores the importance of robust security practices for network devices. As threats evolve, organizations must adapt their security postures to mitigate risks associated with vulnerabilities like CVE-2024-20353.
Security teams should remain vigilant and consider implementing a penetration testing methodology to validate the effectiveness of their defenses against similar vulnerabilities.
Ongoing assessment and adaptation of security measures will be critical in defending against the ever-changing landscape of cyber threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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