CVE-2023-27345
📋 TL;DR
CVE-2023-27345 is a remote code execution vulnerability in PDF-XChange Editor caused by an out-of-bounds write during PDF file parsing. Attackers can exploit this by tricking users into opening a malicious PDF, allowing arbitrary code execution in the context of the current process. Users of affected PDF-XChange Editor versions are at risk.
💻 Affected Systems
- PDF-XChange Editor
📦 What is this software?
Pdf Tools by Pdf Xchange
Pdf Xchange Editor by Pdf Xchange
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining control over the victim's machine, leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation or malware installation on the user's system, potentially resulting in data loss or unauthorized access.
If Mitigated
Limited impact with only application crashes or denial of service if exploit attempts are blocked by security controls like application sandboxing or memory protections.
🎯 Exploit Status
Exploitation requires user interaction but is straightforward once a malicious PDF is opened; weaponization is likely due to the high impact and availability of proof-of-concept details in advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.5.368.0 and later
Vendor Advisory: https://www.tracker-software.com/product/pdf-xchange-editor/history
Restart Required: Yes
Instructions:
1. Open PDF-XChange Editor. 2. Go to Help > Check for Updates. 3. Follow prompts to download and install version 9.5.368.0 or newer. 4. Restart the application after installation.
🔧 Temporary Workarounds
Disable PDF file opening in PDF-XChange Editor
windowsChange file associations to use a different PDF viewer temporarily to prevent exploitation via malicious PDFs.
Control Panel > Default Programs > Set Default Programs, select an alternative PDF viewer and set it as default.
🧯 If You Can't Patch
- Implement application whitelisting to block execution of PDF-XChange Editor or restrict it to trusted sources.
- Use network segmentation and endpoint detection to monitor for suspicious PDF file activities and block malicious downloads.
🔍 How to Verify
Check if Vulnerable:
Check the installed version of PDF-XChange Editor; if it is below 9.5.368.0, it is vulnerable.Check Version:
Open PDF-XChange Editor, go to Help > About, and note the version number displayed.Verify Fix Applied:
Confirm the version is 9.5.368.0 or higher after patching and test by attempting to open a known safe PDF to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Application crash logs from PDF-XChange Editor with memory access violations or out-of-bounds write errors.
- Security logs showing unexpected process creation or network connections after PDF file opens.
Network Indicators:
- Unusual outbound connections from PDF-Xchange Editor process to external IPs, potentially indicating command and control activity.
SIEM Query:
EventID=1000 OR EventID=1001 Source="PDF-XChange Editor" AND (Message contains "access violation" OR "buffer overflow")