CVE-2024-23530
📋 TL;DR
An unauthenticated remote attacker can exploit an out-of-bounds read vulnerability in Ivanti Avalanche's WLAvalancheService component to read sensitive information from memory. This affects Ivanti Avalanche versions before 6.4.3. The vulnerability allows attackers to potentially access confidential data without authentication.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive information like credentials, encryption keys, or other confidential data from memory, potentially leading to full system compromise.
Likely Case
Attackers can read arbitrary memory contents, potentially exposing sensitive configuration data or system information that could be used for further attacks.
If Mitigated
With proper network segmentation and access controls, the impact is limited to information disclosure within the segmented network zone.
🎯 Exploit Status
The vulnerability requires specific conditions to trigger the out-of-bounds read, but no authentication is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.3
Vendor Advisory: https://forums.ivanti.com/s/article/Avalanche-6-4-3-Security-Hardening-and-CVEs-addressed?language=en_US
Restart Required: Yes
Instructions:
1. Download Ivanti Avalanche 6.4.3 from the Ivanti support portal. 2. Backup current configuration and data. 3. Run the installer to upgrade to version 6.4.3. 4. Restart the Avalanche server and services.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to the Avalanche server to only trusted management networks
Firewall Rules
allBlock external access to the WLAvalancheService port (typically 1777/TCP)
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to the Avalanche server
- Monitor for unusual outbound connections or memory access patterns from the Avalanche service
🔍 How to Verify
Check if Vulnerable:
Check the Avalanche version in the web interface or via the installed program versionCheck Version:
Check the version in the Avalanche web interface under Help > AboutVerify Fix Applied:
Verify the version shows 6.4.3 or later in the Avalanche web interface📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns in system logs
- Multiple failed connection attempts to WLAvalancheService
Network Indicators:
- Unusual traffic patterns to port 1777/TCP
- Multiple connection attempts from untrusted sources
SIEM Query:
source_port:1777 AND (event_type:connection_attempt OR event_type:memory_access)