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libssh Authentication Bypass Scanner

This module exploits an authentication bypass in libssh server code where a USERAUTH_SUCCESS message is sent in place of the expected USERAUTH_REQUEST message. libssh versions 0.6.0 through 0.7.5 and 0.8.0 through 0.8.3 are vulnerable. Note that this module's success depends on whether the server code can trigger the correct (shell/exec) callbacks despite only the state machine's authenticated state being set. Therefore, you may or may not get a shell if the server requires additional code paths to be followed.

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Module Name

auxiliary/scanner/ssh/libssh_auth_bypass

Authors

  • Peter Winter-Smith
  • wvu <wvu [at] metasploit.com>

References

Actions

  • Shell
  • Execute

Reliability

Development

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/scanner/ssh/libssh_auth_bypass msf auxiliary(libssh_auth_bypass) > show actions ...actions... msf auxiliary(libssh_auth_bypass) > set ACTION <action-name> msf auxiliary(libssh_auth_bypass) > show options ...show and set options... msf auxiliary(libssh_auth_bypass) > run

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