Android 1.6 Donut through 4.2 Jelly Bean does not properly check
cryptographic signatures for applications, which allows attackers to
execute arbitrary code via an application package file (APK) that is
modified in a way that does not violate the cryptographic signature,
probably involving multiple entries in a Zip file with the same name
in which one entry is validated but the other entry is installed, aka
Android security bug 8219321 and the "Master Key" vulnerability.
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