Debian Security Advisory

DSA-4322-1 libssh -- security update

Date Reported:
17 Oct 2018
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 911149.
In Mitre's CVE dictionary: CVE-2018-10933.
More information:

Peter Winter-Smith of NCC Group discovered that libssh, a tiny C SSH library, contains an authentication bypass vulnerability in the server code. An attacker can take advantage of this flaw to successfully authenticate without any credentials 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.

For the stable distribution (stretch), this problem has been fixed in version 0.7.3-2+deb9u1.

We recommend that you upgrade your libssh packages.

For the detailed security status of libssh please refer to its security tracker page at: