Horizon Alert
Summary of the vulnerability and why it matters
A legacy capability within Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software is susceptible to a vulnerability. This flaw could allow an authenticated local attacker to execute arbitrary code with root-level privileges on an affected device. The exploit requires administrator-level access to initiate.
- Vulnerable legacy VPN client capability
- Improper file validation
- Potential for altered system behavior
Attack Path
How an attacker could exploit the issue
This vulnerability allows an attacker with existing administrator privileges to execute arbitrary code on a Cisco Adaptive Security Appliance or Firepower Threat Defense device. The attack involves the attacker copying a specially crafted file to the device's file system. Once the device is reloaded, the malicious code can execute with root-level privileges, potentially altering system behavior. This persistence across reboots is a key aspect of the exploit.
- Required exposure: Local administrator access.
- Attacker starting point: Authenticated administrator.
- Trigger and result: Copy file, reload device, execute code.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability presents a localized risk, meaning an attacker must already possess administrative access to the affected Cisco devices. The attacker would need to copy a malicious file to the device's system, which could then lead to the execution of arbitrary code upon the next device reload. This could alter system behavior and persist across reboots. The Cisco Security Impact Rating has been raised to High due to the potential for persistent code execution.
- Likely attacker skill: Administrator level access required.
- Required access or conditions: Local access to a device.
- Business risk or urgency: Potential for persistent code execution.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) software. An authenticated local attacker with administrator privileges could exploit this by copying a crafted file to the device. Successful exploitation could allow the attacker to execute arbitrary code, altering system behavior and potentially persisting across reboots. The vendor has escalated the security impact rating for this advisory to High due to the persistence of the exploit.
- Identify exposed Cisco ASA and FTD assets.
- Reduce exposure or isolate affected systems.
- Apply vendor fix, verify, and monitor.
