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CVE-2023-20126 is a vulnerability in the web-based management interface of Cisco SPA112 2-Port Phone Adapters that allows an unauthenticated remote attacker to execute arbitrary code on an affected device. The issue is caused by a missing authentication process in the firmware upgrade function, enabling an attacker to upload/trigger installation of a crafted firmware image. Successful exploitation results in arbitrary code execution on the device with full privileges.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a minimum viable proof-of-concept exploit for CVE-2023-20126, targeting Cisco SPA112/SPA122 VoIP adapters. The exploit consists of a Python script (fwupload.py) that uploads a malicious firmware image to the device's web interface at the /upgrade.cgi endpoint, bypassing authentication. The malicious firmware (not included in the provided files, but referenced as telnet-23000.bin) spawns a telnet daemon on TCP port 23000, providing a root shell to the attacker. The exploit requires network access to the device's web interface and a crafted firmware image. The repository is operational, providing a working exploit chain from upload to shell access, but the firmware creation process is not included here. The main fingerprintable endpoints are the device's web interface (for firmware upload) and the telnet port (23000) opened by the payload.
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