CVE-2023-53937
📋 TL;DR
Hubstaff 1.6.14 has a DLL search order hijacking vulnerability where attackers can place a malicious wow64log.dll in the system32 directory. When Hubstaff starts, it loads this malicious DLL instead of the legitimate system file, allowing attackers to execute arbitrary code. This affects all Windows users running Hubstaff 1.6.14.
💻 Affected Systems
- Hubstaff
📦 What is this software?
Hubstaff by Hubstaff
Hubstaff by Hubstaff
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise via reverse shell with SYSTEM privileges, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive user data, keystrokes, screenshots, and system resources monitored by Hubstaff.
If Mitigated
Limited impact with proper application control policies preventing unauthorized DLL execution and user privilege restrictions.
🎯 Exploit Status
Metasploit module available (exploit/windows/local/hubstaff_dll_hijack). Exploitation requires ability to write to system32 directory, which typically requires administrative privileges or specific misconfigurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.15 or later
Vendor Advisory: https://hubstaff.com/security
Restart Required: Yes
Instructions:
1. Download latest Hubstaff version from official website. 2. Uninstall current version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Restrict DLL loading from system32
windowsUse Windows Defender Application Control or AppLocker to block Hubstaff from loading DLLs from system32 directory.
New-AppLockerPolicy -RuleType Path -Action Deny -Path "C:\Windows\System32\wow64log.dll" -User Everyone
Remove vulnerable version
windowsUninstall Hubstaff 1.6.14 until patched version can be deployed.
wmic product where name="Hubstaff" call uninstall /nointeractive
🧯 If You Can't Patch
- Implement least privilege principle: Run Hubstaff with standard user accounts, not administrative privileges.
- Enable Windows Defender Exploit Guard with Attack Surface Reduction rules to block malicious DLL loading.
🔍 How to Verify
Check if Vulnerable:
Check Hubstaff version in About dialog or verify if wow64log.dll exists in Hubstaff installation directory with improper loading behavior.Check Version:
wmic product where name="Hubstaff" get versionVerify Fix Applied:
Confirm Hubstaff version is 1.6.15 or later and test that application no longer attempts to load wow64log.dll from insecure locations.📡 Detection & Monitoring
Log Indicators:
- Windows Event ID 4688 showing Hubstaff process creation with suspicious parent process
- Sysmon Event ID 7 (Image loaded) showing wow64log.dll loading from non-standard paths
Network Indicators:
- Outbound connections from Hubstaff.exe to unknown IPs on startup
- Reverse shell traffic patterns
SIEM Query:
source="WinEventLog:Security" EventID=4688 AND ProcessName="Hubstaff.exe" AND ParentProcessName NOT IN ("explorer.exe", "svchost.exe")