author:Yifeng Li, Wolin Zhuang;
## Vulnerability description
We found an buffer overflow vulnerability in IP-COM Technology IP-COM’s M50 routers with firmware which was released recently, allows control rules to attack it.
## Buffer Overflow vulnerability
In formAddDnsForward function, the parameter “rules” is directly strcpy to a local variable placed on the stack, which overrides the return address of the function, causing buffer overflow, and so on, we also can control the rules to attack it.
### Buffer Overflow
We set the value of “rules” as aaaaaaaaaaaaaaaaaaaaaaaaa…… and the router will cause buffer overflow.