Plattform
cisco
Komponente
cisco-application-services-engine
CVE-2021-1396 represents a critical remote code execution (RCE) vulnerability impacting Cisco Application Services Engine. Successful exploitation allows an unauthenticated attacker to execute arbitrary commands on the affected system, potentially leading to complete system compromise. This vulnerability affects versions prior to a fixed release, and Cisco has advised users to upgrade as soon as possible.
The impact of CVE-2021-1396 is severe. An attacker exploiting this vulnerability can achieve host-level privileged access, effectively gaining control of the Cisco Application Services Engine instance. This could involve creating diagnostic files containing sensitive information, making limited configuration changes to disrupt services, or, most critically, executing arbitrary code. The ability to execute code opens the door to data exfiltration, malware installation, and lateral movement within the network. Given the critical nature of the vulnerability and the potential for remote, unauthenticated exploitation, the blast radius is significant, potentially impacting all systems relying on the affected Cisco Application Services Engine instance.
CVE-2021-1396 was publicly disclosed on February 24, 2021. While no active exploitation campaigns have been definitively confirmed, the vulnerability's critical severity and ease of exploitation make it a high-priority target. The vulnerability is not currently listed on CISA KEV. Public proof-of-concept exploits are likely to emerge, increasing the risk of exploitation.
Organizations heavily reliant on Cisco Application Services Engine for critical network functions are at significant risk. Specifically, deployments with limited network segmentation or weak access controls are particularly vulnerable. Environments with older, unpatched versions of the Application Services Engine are also at increased risk, as they lack the security fixes included in later releases.
• cisco: Monitor Cisco Application Services Engine logs for unusual activity, particularly attempts to access diagnostic or configuration endpoints.
# Example: Check for suspicious requests in the access logs
grep -i "/api/diagnostics" /var/log/cisco/ase/access.log• generic web: Use curl to probe for exposed diagnostic or configuration endpoints.
curl -v http://<ASE_IP>/api/diagnostics• generic web: Monitor access and error logs for requests containing suspicious payloads or patterns indicative of RCE attempts.
grep -i "system()" /var/log/apache2/access.logdisclosure
Exploit-Status
EPSS
0.83% (74% Perzentil)
CVSS-Vektor
Due to the lack of a specified fixed version, immediate mitigation focuses on reducing the attack surface. Network segmentation should be implemented to isolate the Cisco Application Services Engine from critical systems. Strict access controls, including multi-factor authentication, should be enforced to limit who can access the device. Regularly review and audit configuration changes. Monitor network traffic for suspicious activity, particularly attempts to access administrative interfaces. While a patch is pending, consider implementing a Web Application Firewall (WAF) with rules to block known attack patterns. Once a fixed version is released, prioritize upgrading the Cisco Application Services Engine instance. After upgrade, confirm functionality by verifying access controls and service availability.
Cisco Application Services Engine auf eine nicht anfällige Version aktualisieren. Weitere Details und spezifische Anweisungen zum Update finden Sie in der Cisco Advisory.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2021-1396 is a critical remote code execution vulnerability in Cisco Application Services Engine allowing unauthenticated attackers to gain privileged access and execute commands. It has a CVSS score of 9.8.
You are affected if you are running Cisco Application Services Engine prior to a fixed version. Check your current version against Cisco's advisory for confirmation.
Upgrade to a fixed version of Cisco Application Services Engine as soon as it becomes available. Until then, implement network segmentation and strict access controls as mitigations.
While no active campaigns have been publicly confirmed, the vulnerability's severity warrants immediate attention and the likelihood of exploitation is high.
Refer to the official Cisco Security Advisory for detailed information and mitigation guidance: https://cisco.com/c/en/us/products/security/center/content/cisco-security-advisories/cisco-sa-appservicesengine-multiple-vulnerabilities.html
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