CVE-2024-20370
📋 TL;DR
This vulnerability allows authenticated local attackers with administrative credentials on Cisco ASA/FTD devices to escalate privileges to root by exploiting insecure file permissions and configurations. It affects specific hardware platforms running Cisco FXOS CLI. Attackers need valid admin access to execute the exploit.
💻 Affected Systems
- Cisco Adaptive Security Appliance (ASA) Software
- Cisco Firepower Threat Defense (FTD) Software
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full root control over the firewall/security appliance, allowing complete system compromise, data exfiltration, network pivoting, and persistent backdoor installation.
Likely Case
Malicious insider or compromised admin account uses privilege escalation to bypass security controls, modify configurations, and maintain persistent access.
If Mitigated
With proper access controls and monitoring, exploitation is detected and contained before significant damage occurs.
🎯 Exploit Status
Requires authenticated admin access and multiple steps including file manipulation and CLI configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Multiple fixed versions available - see Cisco advisory for specific version matrix
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-priv-esc-hBS9gnwq
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download appropriate fixed software from Cisco. 3. Backup configurations. 4. Upgrade to fixed version. 5. Verify upgrade success and functionality.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative access to trusted users only and implement strong authentication controls
Monitor Administrative Activity
ciscoEnable detailed logging of administrative sessions and file system changes
logging enable
logging timestamp
logging buffered informational
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for administrative accounts
- Monitor for suspicious administrative activity and file system modifications
🔍 How to Verify
Check if Vulnerable:
Check device model and software version against Cisco advisory. Use 'show version' command to verify if running affected hardware/software.Check Version:
show versionVerify Fix Applied:
After patching, verify version is updated to fixed release using 'show version' command and test administrative functions.📡 Detection & Monitoring
Log Indicators:
- Unusual administrative CLI access patterns
- File system permission changes
- Unexpected file downloads or modifications
- Privilege escalation attempts
Network Indicators:
- Unusual administrative SSH/Telnet sessions
- Anomalous configuration changes
SIEM Query:
source="cisco_asa" OR source="cisco_ftd" AND (event_type="admin_login" OR event_type="file_modification" OR event_type="privilege_change")