AutomationDirect DirectLogic H2-DM1E Authentication Bypass by Capture-replay

Description

The session hijacking attack targets the application layer's control mechanism, which manages authenticated sessions between a host PC and a PLC. During such sessions, a session key is utilized to maintain security. However, if an attacker captures this session key, they can inject traffic into an ongoing authenticated session. To successfully achieve this, the attacker also needs to spoof both the IP address and MAC address of the originating host which is typical of a session-based attack.

Scores

EPSS (exploitation in 30 days)

0.28% · top 79% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.

Weakness

• CWE-294 Authentication Bypass by Capture-replay (opens in a new tab)All about CWE-294 and its CVEs

Affected products

• AutomationDirect · DirectLogic H2-DM1E

  • affected ≤ 2.8.0

What to do

Workaround: As part of their ongoing risk assessment, AutomationDirect has determined that the H2-DM1E, due to its age and inherent architectural limitations, can no longer be supported within the secure development lifecycle. To address these challenges, AutomationDirect recommends the following mitigation strategies based on a thorough risk assessment: * Upgrade to the BRX platform: Transitioning to the BRX platform is strongly advised, as it is designed to meet current security standards and is actively maintained within AutomationDirect's secure development lifecycle. * Network segmentation and air gapping: To mitigate risks associated with the H2-DM1E, AutomationDirect recommends implementing network segmentation and air gapping. This strategy will isolate the older technology from the broader network, reducing its exposure to external threats and minimizing the impact of any security vulnerabilities. * Deploy a StrideLinx secure VPN platform: AutomationDirect also recommends placing the system behind a StrideLinx VPN platform. These mitigation strategies provide a comprehensive approach to managing the risks associated with the H2-DM1E while preparing for future security needs. Please reach out to AutomationDirect https://www.automationdirect.com/adc/contactus/contactus  if you have any further questions or require additional details on these recommendations.

References (1)

• https://www.cisa.gov/news-events/ics-advisories/icsa-24-256-17 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-43099](https://trackcve.app/badge/CVE-2024-43099.svg)](https://trackcve.app/cve/CVE-2024-43099)

Record last updated 13 Sept 2024, 17:43 UTC.