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Category:   Application (Security)  >   Juniper NSM Vendors:   Juniper
(Juniper Issues Fix for Juniper NSM) OpenSSH 'KbdInteractiveDevices' Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1037614
SecurityTracker URL:  http://securitytracker.com/id/1037614
CVE Reference:   CVE-2015-5600   (Links to External Site)
Date:  Jan 18 2017
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): NSM3000, NSM4000, NSMExpress
Description:   A vulnerability was reported in OpenSSH. A remote user can bypass authentication attempt limits on the target system. Juniper NSM is affected.

A remote user can request the keyboard-interactive authentication option ('KbdInteractiveDevices') to open a large number of keyboard-interactive devices on the target server and perform a brute-force password guessing attack against the target sshd service. The number of password attempts can effectively exceed the 'MaxAuthTries' limit and are permitted to occur until the 'LoginGraceTime' limit is reached or the number of keyboard-interactive devices are used.

Servers that have keyboard-interactive authentication enabled (e.g., FreeBSD in the default configuration) are affected.

A demonstration exploit command is provided:

ssh -l[username] -oKbdInteractiveDevices=`perl -e 'print "pam," x 10000'` [target]

The original advisory is available at:

https://kingcope.wordpress.com/2015/07/16/openssh-keyboard-interactive-authentication-brute-force-vulnerability-maxauthtries-bypass/

kingcope reported this vulnerability.

Impact:   A remote user can bypass authentication attempt limits on the target system.
Solution:   The vendor has issued a fix (NSM Appliance Upgrade Package v3).

The Juniper advisory is available at:

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10774

Vendor URL:  kb.juniper.net/InfoCenter/index?page=content&id=JSA10774 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Jul 20 2015 OpenSSH 'KbdInteractiveDevices' Lets Remote Users Bypass Security Restrictions on the Target System



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