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Category:   Device (Embedded Server/Appliance)  >   IBM BladeCenter Vendors:   IBM
(IBM Issues Fix for IBM BladeCenter Advanced Management Module) OpenSSH 'KbdInteractiveDevices' Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1035411
SecurityTracker URL:  http://securitytracker.com/id/1035411
CVE Reference:   CVE-2015-5600   (Links to External Site)
Date:  Mar 25 2016
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): AMM bpet66n-3.66n
Description:   A vulnerability was reported in OpenSSH. A remote user can bypass authentication attempt limits on the target system. IBM BladeCenter Advanced Management Module 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:   IBM has issued a fix for IBM BladeCenter Advanced Management Module (bpet66p-3.66p).

The IBM advisory is available at:

https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=migr-5099240

Vendor URL:  www-947.ibm.com/support/entry/portal/docdisplay?lndocid=migr-5099240 (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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