oss-security - CVE-2018-10933: libssh: authentication bypass in server code

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Message-ID: <20181016122143.o7bwrhh3chhmhguk@suse.de>
Date: Tue, 16 Oct 2018 14:21:43 +0200
From: Marcus Meissner <meissner@...e.de>
To: OSS Security List <oss-security@...ts.openwall.com>
Subject: CVE-2018-10933: libssh: authentication bypass in server code

Hi,

https://www.libssh.org/2018/10/16/libssh-0-8-4-and-0-7-6-security-and-bugfix-release/

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libssh 0.8.4 and 0.7.6 security and bugfix release

This is an important security and maintenance release in order to address CVE-2018-10933.

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.
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This only affects libssh operating in _server_ mode, but not the usual used client mode.

Ciao, Marcus

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