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AUSCERT External Security Bulletin Redistribution
ESB-2015.3031
Cisco IOS XE 3S Platforms Series root Shell License Bypass Vulnerability
7 December 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XE 3S platforms
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6383
Reference: ESB-2015.3007
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151130-iosxe3s
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Cisco Security Advisory
Cisco IOS XE 3S Platforms Series root Shell License Bypass Vulnerability
Medium
Advisory ID:
cisco-sa-20151130-iosxe3s
Last Updated:
2015 December 3 23:12 GMT
Published:
2015 November 30 00:00 GMT
Version 2.1:
Final
CVSS Score:
Base - 6.8
Workarounds:
Yes
Cisco Bug IDs:
CSCuv93130
CVE-2015-6383
CWE-264
Summary
A vulnerability in one of the diagnostic commands in the Cisco IOS XE
operating system for Cisco IOS XE 3S platforms could allow an authenticated,
privileged, local attacker to gain restricted root shell access. The root
shell is provided for advanced troubleshooting with Cisco Technical Assistance
Center (TAC) engineers and requires a license.
The vulnerability occurs because the parameters to diagnostic commands at the
command-line interface (CLI) are not properly validated. An attacker could
exploit this vulnerability by authenticating to the affected device at
privileged level 15 and providing crafted parameters to the diagnostic
commands. An exploit could allow the authenticated, privileged attacker to
bypass the license required for root shell access. If the authenticated user
obtains root shell access, further compromise may be possible.
Cisco has released software updates that address this vulnerability. There are
no workarounds that address this vulnerability.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151130-iosxe3s
Affected Products
Vulnerable Products
All versions of Cisco IOS XE 3S Software are vulnerable.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
The diagnostic commands can be blocked at the CLI using TACACS+ command
authorization. The list of commands to be blocked and instructions for
implementation are at the following link:
http://www.cisco.com/web/about/security/intelligence/ios-xe-integrity-assurance.html#_Toc392234313
Fixed Software
When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade
solution.
In all cases, customers should ensure that the devices to be upgraded contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release. If
the information is not clear, customers are advised to contact the Cisco TAC
or their contracted maintenance providers.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described
in this advisory.
URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151130-iosxe3s
Revision History
Version Description Section Status Date
2.1 Updated Summary. Summary, Final 2015-December-03
Added a workaround. Workarounds
2.0 Changed publication Affected Final 2015-December-03
title and identifier Products
name. Also clarified
the affected products.
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.
Cisco Security Vulnerability Policy
To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
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