CVE-2023-35897
📋 TL;DR
This CVE describes a DLL hijacking vulnerability in IBM Spectrum Protect Client and IBM Storage Protect for Virtual Environments. A local authenticated user could execute arbitrary code with system privileges by placing a malicious DLL in a location where the application searches for it. This affects versions 8.1.0.0 through 8.1.19.0.
💻 Affected Systems
- IBM Spectrum Protect Client
- IBM Storage Protect for Virtual Environments
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to SYSTEM/root level, allowing complete system compromise, data theft, and persistence establishment.
Likely Case
Local authenticated user gains elevated privileges to install malware, access sensitive data, or disrupt backup operations.
If Mitigated
Limited impact due to proper access controls, least privilege principles, and timely patching.
🎯 Exploit Status
DLL hijacking vulnerabilities are typically straightforward to exploit once the vulnerable DLL search path is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.1.20.0 and later
Vendor Advisory: https://www.ibm.com/support/pages/node/7037299
Restart Required: Yes
Instructions:
1. Download IBM Spectrum Protect Client or IBM Storage Protect for Virtual Environments version 8.1.20.0 or later from IBM Fix Central. 2. Install the update following IBM's installation documentation. 3. Restart the system to ensure all components are updated.
🔧 Temporary Workarounds
Restrict DLL search paths
allConfigure the application to use secure DLL search paths or set appropriate permissions on directories.
On Windows: Use Group Policy to restrict DLL search order or set appropriate ACLs on vulnerable directories.
On Linux: Use chmod to restrict write permissions on directories in the library search path.
🧯 If You Can't Patch
- Implement strict access controls to limit local user access to systems running vulnerable software.
- Monitor for suspicious DLL loading events using security tools and audit logs.
🔍 How to Verify
Check if Vulnerable:
Check the installed version of IBM Spectrum Protect Client or IBM Storage Protect for Virtual Environments. If version is between 8.1.0.0 and 8.1.19.0 inclusive, the system is vulnerable.Check Version:
On Windows: Check via Programs and Features or run 'dsmc' command with version flag. On Linux: Check package version using rpm/dpkg or run 'dsmc' command.Verify Fix Applied:
Verify the installed version is 8.1.20.0 or later and that no unauthorized DLL files exist in application directories.📡 Detection & Monitoring
Log Indicators:
- Unexpected DLL loading events in application logs
- Security logs showing privilege escalation attempts
Network Indicators:
- None - this is a local exploit
SIEM Query:
Search for events where IBM Spectrum Protect processes load DLLs from unexpected locations or user directories.