CVE-2021-40683
📋 TL;DR
This vulnerability in Akamai EAA Client involves an unquoted service path that could allow local attackers to escalate privileges by placing malicious executables in the path. It affects organizations using Akamai Enterprise Application Access Client on Windows systems. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Akamai Enterprise Application Access Client
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains SYSTEM-level privileges on the Windows host, enabling complete compromise of the system and potential lateral movement within the network.
Likely Case
Local user with limited privileges escalates to administrator/SYSTEM level, allowing installation of malware, data theft, or persistence mechanisms.
If Mitigated
With proper endpoint security controls and least privilege principles, impact is limited to the local system with containment preventing network spread.
🎯 Exploit Status
Requires local access to the Windows system. Unquoted service path vulnerabilities are well-understood attack vectors in Windows environments.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.1, 2.4.1, or 2.5.3 depending on your version track
Vendor Advisory: https://akamai.com/blog/news/eaa-client-escalation-of-privilege-vulnerability
Restart Required: Yes
Instructions:
1. Identify current EAA Client version. 2. Download appropriate patched version from Akamai portal. 3. Install update following Akamai documentation. 4. Restart the system to ensure service updates take effect.
🔧 Temporary Workarounds
Manual Service Path Quoting
windowsManually edit the EAA Client service to use quoted paths in Windows Registry
reg add "HKLM\SYSTEM\CurrentControlSet\Services\AkamaiEAA" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\Akamai\EAA Client\eaa_client.exe\"" /f
Restrict Write Permissions
windowsRemove write permissions from directories in the unquoted service path
icacls "C:\Program Files" /deny Everyone:(OI)(CI)W
icacls "C:\Program Files\Akamai" /deny Everyone:(OI)(CI)W
🧯 If You Can't Patch
- Implement strict endpoint security controls to detect and prevent privilege escalation attempts
- Apply principle of least privilege and restrict local user access to vulnerable systems
🔍 How to Verify
Check if Vulnerable:
Check EAA Client version via Windows Programs and Features or run: "C:\Program Files\Akamai\EAA Client\eaa_client.exe" --versionCheck Version:
"C:\Program Files\Akamai\EAA Client\eaa_client.exe" --versionVerify Fix Applied:
Verify version is 2.3.1, 2.4.1, or 2.5.3 or higher, and check Windows service configuration has quoted paths📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing unexpected service modifications
- Security logs with privilege escalation attempts
- Process creation from unusual paths in Program Files directories
Network Indicators:
- Unusual outbound connections from EAA Client service
- Lateral movement attempts from previously low-privilege accounts
SIEM Query:
EventID=4688 AND (NewProcessName="*\\Program Files\\Akamai\\*") AND SubjectUserName!="SYSTEM"