(Pwn2Own) Silicon Labs Gecko OS http_download Stack-based Buffer Overflow Remote Code Execution Vulnerability

June 21st, 2024
ZDI-24-870 ZDI-CAN-23226

CVE ID

CVE-2024-24731

CVSS Score

7.5 AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Silicon Labs

Affected Products

Gecko OS

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Silicon Labs Gecko OS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of the http_download command. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the device.

Additional Details

Silicon Labs has issued an update to correct this vulnerability. More details can be found at:
https://community.silabs.com/a45Vm0000000Atp

Disclosure Timeline

  • 2024-02-12 - Vulnerability reported to vendor
  • 2024-06-21 - Coordinated public release of advisory
  • 2024-08-15 - Advisory Updated

Credit

Connor Ford (@ByteInsight)

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