how to steal openssh private key

[nothacking <nothacking () 163 com>]

Hello everybody:
     environment is A is hacker client， B is target and C is Manager center and C have all A and B private key.
     C are open 80,22. And this is http's 403 state on the C.
     I have A's root,how to steal private key On the C. Are there have some vuln with openssh.
     Is there some impossible which C login in to the A and B when A and B let C run some bash.

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