The MagicJack device, a VoIP solution for internet phone calls, contains a hidden NAND flash memory partition allowing unauthorized read/write access. Attackers can exploit this by replacing the original software with a malicious version, leading to ransomware deployment on the host computer. Affected devices have firmware versions prior to magicJack A921 USB Phone Jack Rev 3.0 V1.4.

Insecure Permissions vulnerability found in MagicJack A921 USB Phone Jack Rev 3.0 v.1.4 allows a physically proximate attacker to escalate privileges and gain access to sensitive information via the NAND flash memory.