Overview

On October 16, local time, libssh officially released an update to fix the server-side identity authentication bypass vulnerability (CVE-2018-10933) existing in libssh 0.6 and later versions. 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 authenticate without any credentials.

CVSS V3.0 base score: 9.8

CVSS vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Reference link:

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

Affected Versions

  • libssh version >= 0.6
  • libssh version < 0.8.4
  • libssh version < 0.7.6

Unaffected Versions

  • libssh version = 0.8.4, 0.7.6

Solution

libssh has released unaffected versions. Affected users are advised to upgrade their products as soon as possible. The new unaffected versions libssh 0.0.4 and 0.7.6 can be downloaded from the following link: https://www.libssh.org/files/

Statement

This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.

About NSFOCUS

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