Full Report
A buffer overflow vulnerability in Delta Industrial Automation COMMGR software could lead to remote code execution, cause the application to crash, or cause a denial-of-service condition in the application server
Analysis Summary
# Vulnerability: Buffer Overflow in Delta Industrial Automation COMMGR
## CVE Details
- **CVE ID:** CVE-2018-10594
- **CVSS Score:** 9.8 (Critical)
- **CWE:** CWE-121 (Stack-based Buffer Overflow)
## Affected Systems
- **Products:** Delta Industrial Automation COMMGR (Communication Management Software)
- **Versions:** Version 1.08 and prior.
- **Configurations:** Systems where the COMMGR service is running and accessible via the network (typically listening on TCP port 502).
## Vulnerability Description
The vulnerability is a stack-based buffer overflow that exists within the Delta Industrial Automation COMMGR software. The flaw is triggered when the application fails to properly validate the length of user-supplied data before copying it to a fixed-length stack buffer. An attacker can send a specially crafted packet to the COMMGR service, overwriting the return address on the stack.
## Exploitation
- **Status:** PoC available / Publicly disclosed (Historically exploited in research contexts).
- **Complexity:** Low
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Potential for Remote Code Execution to steal data)
- **Integrity:** High (Potential for unauthorized system modification)
- **Availability:** High (Can result in application crash or Denial-of-Service condition)
## Remediation
### Patches
- **Update to COMMGR version 1.09 or later.** Delta Industrial Automation has released updated versions to address this specific memory corruption flaw.
### Workarounds
- **Network Segmentation:** Place industrial control systems and communication managers behind a firewall and ensure they are not accessible from the public internet.
- **Port Filtering:** Restrict access to the ports used by COMMGR (e.g., TCP 502) to only authorized engineering workstations.
- **Least Privilege:** Run the COMMGR service with the minimum necessary privileges to mitigate the impact of a potential compromise.
## Detection
- **Indicators of Compromise:** Unexpected crashes of the `COMMGR.exe` process or unauthorized remote connections to the service port.
- **Detection methods and tools:**
- Use Intrusion Detection Systems (IDS) to monitor for malformed or unusually large packets directed at the COMMGR service port.
- Audit windows event logs for application errors related to COMMGR.
## References
- **Vendor Advisory:** hxxps[://]www[.]deltaww[.]com/en-US/products/Industrial-Automation/
- **CISA Advisory (ICSA-18-172-01):** hxxps[://]www[.]cisa[.]gov/news-events/ics-advisories/icsa-18-172-01
- **Kaspersky ICS CERT:** hxxps[://]ics-cert[.]kaspersky[.]com/advisories/2018/06/27/vulnerability-in-delta-industrial-automation-commgr-software/