CVE-2024-20419
📋 TL;DR
This critical vulnerability in Cisco Smart Software Manager On-Prem allows unauthenticated remote attackers to change any user's password, including administrators, by sending crafted HTTP requests. This could lead to complete compromise of affected systems. All organizations running vulnerable versions of SSM On-Prem are affected.
💻 Affected Systems
- Cisco Smart Software Manager On-Prem
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover where attackers gain administrative access, potentially compromising the entire SSM On-Prem deployment and any connected systems.
Likely Case
Attackers gain administrative access to SSM On-Prem, allowing them to modify configurations, access sensitive data, and potentially pivot to other systems.
If Mitigated
If proper network segmentation and access controls are in place, impact may be limited to the SSM On-Prem system itself.
🎯 Exploit Status
The vulnerability requires only crafted HTTP requests, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cssm-auth-sLw3uhUy
Restart Required: Yes
Instructions:
1. Review Cisco advisory for fixed version. 2. Backup current configuration. 3. Download and install the patched version from Cisco. 4. Restart the SSM On-Prem appliance. 5. Verify functionality post-update.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to SSM On-Prem to only trusted IP addresses and networks
Use firewall rules to limit access: iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate the SSM On-Prem system from untrusted networks using firewall rules
- Implement strict network segmentation and monitor for suspicious authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check SSM On-Prem version against Cisco advisory. If running vulnerable version, assume vulnerable.Check Version:
Check SSM On-Prem web interface or CLI for version informationVerify Fix Applied:
Verify installed version matches or exceeds the patched version specified in Cisco advisory.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful password changes
- Password change requests from unusual IP addresses
- Administrative password changes from non-admin users
Network Indicators:
- HTTP POST requests to password change endpoints from unauthenticated sources
- Unusual traffic patterns to SSM On-Prem authentication endpoints
SIEM Query:
source="ssm-on-prem" AND (event_type="password_change" OR uri="/api/auth/changepassword") AND src_ip NOT IN [trusted_ips]🔗 References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cssm-auth-sLw3uhUy
- https://www.secpod.com/blog/critical-flaw-in-ciscos-secure-email-gateways-allows-attackers-to-control-the-device-completely/
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cssm-auth-sLw3uhUy
