Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) software. This flaw allows an unauthenticated, remote attacker to access sensitive files on a targeted system. The issue stems from inadequate validation of URLs in HTTP requests. Successful exploitation enables an attacker to view arbitrary files within the web services file system.
- Vulnerable web services interface
- Improper URL input validation
- Sensitive file disclosure
Attack Path
How an attacker could exploit the issue
This vulnerability allows an unauthenticated attacker to read sensitive files from a targeted system. The attacker exploits a flaw in how the web services interface handles URLs. By sending a specially crafted HTTP request, an attacker can trick the system into revealing files within its web services file system. This is possible when the device is configured for WebVPN or AnyConnect features.
- Network exposure required.
- Attacker sends crafted request.
- Attacker reads arbitrary files.
Live Threat
Current exploitation, exposure, and threat context
A remote attacker with a low skill level could exploit a vulnerability in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) software. This exploit allows the attacker to read sensitive files on the targeted system by sending a crafted HTTP request. Successful exploitation could lead to unauthorized viewing of arbitrary files within the web services file system, posing a significant business risk.
- Likely attacker skill level: Low
- Required access or conditions: No authentication required
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
An organization should address this vulnerability by first identifying all Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) devices that are configured with WebVPN or AnyConnect. These systems, if exposed externally and running affected software, could allow an unauthenticated attacker to read sensitive files from the web services file system. The vulnerability stems from improper input validation of URLs in HTTP requests.
- Identify exposed Cisco ASA/FTD systems.
- Reduce exposure or isolate risk.
- Apply vendor fixes and verify.
- Monitor for related activity.
