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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS/IOS XE SSHv2 Bug Lets Remote Users Bypass Authentication on the Target System
SecurityTracker Alert ID:  1033646
SecurityTracker URL:  http://securitytracker.com/id/1033646
CVE Reference:   CVE-2015-6280   (Links to External Site)
Date:  Sep 23 2015
Impact:   User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco IOS/IOS XE. A remote user can bypass authentication.

A remote user with knowledge of a username configured for SSHv2 RSA authentication and with access to the target user's public key can supply a specially crafted RSA private key to bypass authentication and access the target device with the privileges of the target user configured for the virtual teletype (VTY) line.
The vendor has assigned bug ID CSCus73013 to this vulnerability.

Mathias Seiler from MiroNet AG reported this vulnerability.

Impact:   A remote user can bypass authentication on the target system.
Solution:   Cisco has issued a fix.

A patch matrix is available in the vendor's advisory.

The Cisco advisory is available at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150923-sshpk

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150923-sshpk (Links to External Site)
Cause:   Authentication error

Message History:   None.


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