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Test ID:1.3.6.1.4.1.25623.1.0.891548
Category:Debian Local Security Checks
Title:Debian LTS Advisory ([SECURITY] [DLA 1548-1] libssh security update)
Summary: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.
Description:Summary:
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.

Vulnerability Insight:
The ssh library was designed to be used by programmers needing a working
SSH implementation by the mean of a library.

Affected Software/OS:
libssh on Debian Linux

Solution:
For Debian 8 'Jessie', this problem has been fixed in version
0.6.3-4+deb8u3.

We recommend that you upgrade your libssh packages.

CVSS Score:
6.4

CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2018-10933
CopyrightCopyright (c) 2018 Greenbone Networks GmbH http://greenbone.net

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