The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-4965 advisory.

  - A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared     secrets during the lifetime of the session. One of them is called secret_hash and the other session_id.
    Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as     an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked     as long as these buffers were same. But the key re-exchange operation can also change the key exchange     method, which can be based on hash of different size, eventually creating secret_hash of different size     than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used     again during second key re-exchange. (CVE-2021-3634)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

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Debian DSA-4965-1 : libssh - security update

medium Nessus Plugin ID 152967

Version 1.5