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Amcrest IPM-721S V2.420.AC00.16.R.20160909 devices contain hardcoded default credentials embedded in the firmware. These credentials can be extracted by reverse engineering the firmware image, specifically by analyzing the 'sonia' binary in the /usr directory. The function sub_3DB2FC is responsible for setting up the default credential values, which are then written to the configuration file /mnt/mtd/Config/Account1 via sub_5C057C. The credentials are accessible to anyone with access to the firmware image, enabling unauthorized access to the device.
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