======================================================================= == Subject: Authentication bypass in server code

== CVE ID#: CVE-2018-10933

== Versions: All versions of libssh 0.6 and later

== Summary: There is a vulnerability within the server code which == can enable a client to bypass the authentication == process and set the internal state machine maintained == by the library to authenticated, enabling the == (otherwise prohibited) creation of channels.

=======================================================================

=========== Description

libssh versions 0.6 and above have an authentication bypass vulnerability in the server code. By presenting the server an SSH2_MSG_USERAUTH_SUCCESS message in place of the SSH2_MSG_USERAUTH_REQUEST message which the server would expect to initiate authentication, the attacker could successfully authentciate without any credentials.

The bug was discovered by Peter Winter-Smith of NCC Group.

================== Patch Availability

Patches addressing the issue have been posted to:

https://www.libssh.org/

libssh version 0.8.4 and libssh 0.7.6 have been released to address this issue.

========== Workaround

There is no workaround for this issue.

======= Credits

The bug was discovered by Peter Winter-Smith of NCC Group.# libssh zero day POC

======= DETECTION

Hunt for CVE2018-10933 Marco Lancini (Hashes, Kabana) https://github.com/marco-lancini/hunt-for-cve-2018-10933

libssh vulnerability CVE2018-10933 Scanner Leap Security https://github.com/leapsecurity/libssh-scanner