The Phenoelit Group has reported a vulnerability in Siemens S55 cell phones, which potentially can be exploited by malicious Java applications to trick users into sending SMS messages unknowingly.
The Siemens S55 cell phone includes a Java virtual machine for executing Java applications. The Java API allows an application to send out SMS messages but will prompt the user with a message screen before doing so.
However, the Java API also allows creation of personal screen layouts for an application. This can potentially be exploited to send out SMS messages without the user's knowledge by overlaying the message asking for permissions with an arbitrary screen.
Solution: Never run untrusted applications.
Provided and/or discovered by: FtR and FX, Phenoelit Group.
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