Executive Summary

This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Title Cisco StarOS SSH Privilege Escalation Vulnerability
Name cisco-sa-20170315-asr First vendor Publication 2017-03-15
Vendor Cisco Last vendor Modification 2017-03-15
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:C/I:C/A:C)
Cvss Base Score 9 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 8 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores


A privilege escalation vulnerability in the Secure Shell (SSH) subsystem in the StarOS operating system for Cisco ASR 5000 Series, ASR 5500 Series, ASR 5700 Series devices, and Cisco Virtualized Packet Core could allow an authenticated, remote attacker to gain unrestricted, root shell access.

The vulnerability is due to missing input validation of parameters passed during SSH or SFTP login. An attacker could exploit this vulnerability by providing crafted user input to the SSH or SFTP command-line interface (CLI) during SSH or SFTP login. An exploit could allow an authenticated attacker to gain root privileges access on the router.

Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered via both IPv4 and IPv6 traffic. An established TCP connection toward port 22, the SSH default port, is needed to perform the attack. The attacker must have valid credentials to login to the system via SSH or SFTP.

Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available.

This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asr ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asr"]


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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-306 Missing Authentication for Critical Function (CWE/SANS Top 25)

CPE : Common Platform Enumeration

Application 21
Application 3

Nessus® Vulnerability Scanner

Date Description
2017-04-10 Name : The remote device is affected by a privilege escalation vulnerability.
File : cisco-sa-20170315-asr.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2017-04-11 13:20:40
  • Multiple Updates
2017-03-30 21:24:44
  • Multiple Updates
2017-03-16 00:21:07
  • Multiple Updates
2017-03-15 21:23:28
  • First insertion