Synopsis: SMS handling OpenSER remote code executing
Product: OpenSER
Version: <=1.1.0

Issue:

A critical security vulnerability has been found in OpenSER SMS
handling module. The vulnerable function should read the SMS
from the SIM-memory.

Details:

int fetchsms(struct modem mdm, int sim, char pdu)

The usage of this fuction might lead to memory corruption
conditions. Due to memory corruption conditions remote
code execution is possible. It happens when "beginning"
is copied to functions argument PDU (char*).

Affected Versions

OpenSER <= 1.1.0

Solution

Proper boundary checking.

Exploitation

Exploitation might be conducted by preparing a specially
crafted SMS message.