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Category:   Device (Router/Bridge/Hub)  >   Cisco ASR Router Vendors:   Cisco
Cisco ASR Router SSH Input Validation Flaw Lets Remote Authenticated Users Gain Root Privileges
SecurityTracker Alert ID:  1038050
SecurityTracker URL:  http://securitytracker.com/id/1038050
CVE Reference:   CVE-2017-3819   (Links to External Site)
Date:  Mar 15 2017
Impact:   Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5000/5500/5700 Series; StarOS after 17.7.0 and prior to 18.7.4, 19.5, and 20.2.3
Description:   A vulnerability was reported in Cisco ASR Router. A remote authenticated user can gain elevated privileges.

A remote authenticated user can send specially crafted data to TCP port 22 on the target system to exploit an input validation flaw in the StarOS SSH and SFTP subsystem to gain root shell access.

The vendor has assigned bug ID CSCva65853 to this vulnerability.

Impact:   A remote authenticated user can gain root privileges on the target system.
Solution:   The vendor has issued a fix (18.7.4, 19.5, 20.2.3).

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asr

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asr (Links to External Site)
Cause:   Input validation error

Message History:   None.


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