CVE-2020-14509: Wibu CodeMeter Buffer Overflow Flaw

CVE-2020-14509 Overview

Multiple memory corruption vulnerabilities exist in Wibu CodeMeter where the packet parser mechanism does not verify length fields. An attacker could send specially crafted packets to exploit these vulnerabilities, potentially leading to remote code execution, denial of service, or unauthorized access to protected systems.

Critical Impact

These memory corruption flaws in the CodeMeter packet parser allow unauthenticated remote attackers to send malicious network packets that can compromise the confidentiality, integrity, and availability of affected systems.

Affected Products

• Wibu CodeMeter (All versions prior to 7.10)

Discovery Timeline

• 2020-09-16 - CVE-2020-14509 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2020-14509

Vulnerability Analysis

This vulnerability stems from improper input validation in the CodeMeter packet parser component. The parser fails to properly verify length fields within incoming network packets before processing them. This weakness allows attackers to craft malicious packets containing incorrect length values, which can lead to various memory corruption conditions including buffer overflows and out-of-bounds memory access.

The vulnerability is classified under CWE-805 (Buffer Access with Incorrect Length Value), indicating that the software improperly calculates buffer sizes or offsets based on untrusted length fields, leading to memory corruption. Since CodeMeter is widely used as a software protection and licensing solution across industrial control systems (ICS) and critical infrastructure, successful exploitation could have severe consequences for organizations relying on this technology.

Root Cause

The root cause of this vulnerability lies in the CodeMeter packet parser's failure to validate length fields in incoming network packets. When processing network data, the parser trusts the length values provided within packets without performing adequate boundary checks. This allows an attacker to specify arbitrary length values that cause the application to read or write beyond allocated buffer boundaries, resulting in memory corruption conditions.

Attack Vector

The attack vector for CVE-2020-14509 is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted packets directly to the CodeMeter service over the network. The attack can be executed remotely, making it particularly dangerous for internet-facing or network-accessible CodeMeter installations.

The exploitation process involves:

1. Identifying a target system running a vulnerable version of CodeMeter
2. Crafting malicious network packets with manipulated length fields
3. Sending these packets to the CodeMeter service to trigger memory corruption
4. Potentially achieving code execution, service disruption, or information disclosure

Due to the nature of memory corruption vulnerabilities, successful exploitation could result in complete system compromise with the same privileges as the CodeMeter service.

Detection Methods for CVE-2020-14509

Indicators of Compromise

• Unexpected crashes or service restarts of the CodeMeter runtime service
• Anomalous network traffic patterns targeting CodeMeter service ports (typically TCP port 22350)
• Memory access violations or segmentation faults in CodeMeter process logs
• Unusual process behavior or child processes spawned by CodeMeter components

Detection Strategies

• Implement network intrusion detection rules to monitor for malformed packets targeting CodeMeter services
• Deploy endpoint detection and response (EDR) solutions to identify memory corruption exploitation attempts
• Configure application crash monitoring to alert on CodeMeter service failures
• Review network traffic for connections from untrusted sources to CodeMeter ports

Monitoring Recommendations

• Enable detailed logging for the CodeMeter service and forward logs to a SIEM solution
• Monitor for network reconnaissance activity targeting CodeMeter service ports
• Implement network segmentation to limit exposure of CodeMeter services
• Configure alerts for any unexpected CodeMeter service behavior or resource consumption anomalies

How to Mitigate CVE-2020-14509

Immediate Actions Required

• Update Wibu CodeMeter to version 7.10 or later immediately
• Restrict network access to CodeMeter services using firewall rules to trusted sources only
• Isolate systems running vulnerable CodeMeter versions from untrusted networks
• Implement network segmentation to minimize attack surface for industrial control systems

Patch Information

Wibu Systems has addressed this vulnerability in CodeMeter version 7.10. Organizations should upgrade to this version or later to remediate the vulnerability. For detailed information about the vulnerability and remediation guidance, refer to the CISA ICS Advisory ICSA-20-203-01.

Workarounds

• Block external network access to CodeMeter service ports (default TCP 22350) at the perimeter firewall
• Implement strict network access control lists limiting CodeMeter communication to authorized hosts only
• Deploy a web application firewall or network-based intrusion prevention system with rules to detect malformed packets
• Consider temporarily disabling CodeMeter network services if not required until patching can be completed