20 December 2021
Inside a PBX - Discovering a Firmware Backdoor

This blog post illustrates how RedTeam Pentesting discovered a real-world backdoor in a widely used Auerswald phone system (see also the advisory and CVE-2021-40859). We will describe the methodology used to find the backdoor by examining the firmware, highlight the practical implications of the vulnerability and outline our communications with Auerswald.
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