Advisory Details

June 21st, 2024

(Pwn2Own) Autel MaxiCharger AC Elite Business C50 DLB_HostHeartBeat Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-24-854
ZDI-CAN-23241

CVE ID CVE-2024-23957
CVSS SCORE 8.8, AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Autel
AFFECTED PRODUCTS MaxiCharger AC Elite Business C50
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Autel MaxiCharger AC Elite Business C50 charging stations. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the DLB_HostHeartBeat handler of the DLB protocol implementation. When parsing an AES key, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the device.

ADDITIONAL DETAILS

Fixed in US Firmware v1.35.00 and EU Firmware v1.50.00.


DISCLOSURE TIMELINE
  • 2024-02-09 - Vulnerability reported to vendor
  • 2024-06-21 - Coordinated public release of advisory
  • 2024-08-15 - Advisory Updated
CREDIT Midnight Blue / PHP Hooligans
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