rigan has reported a vulnerability in usbmuxd, which potentially can be exploited by malicious people with physical access to compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the "receive_packet()" function (libusbmuxd/libusbmuxd.c) when processing a property list containing an overly long "SerialNumber" field, which can be exploited to cause a heap-based buffer overflow.
Successful exploitation may allow the execution of arbitrary code, but requires that the attacker is able to connect a malicious USB device.
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