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Debian Security Advisory DSA-4322-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
October 17, 2018                      https://www.debian.org/security/faq
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Package        : libssh
CVE ID         : CVE-2018-10933
Debian Bug     : 911149

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:
https://security-tracker.debian.org/tracker/libssh

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org