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AUSCERT External Security Bulletin Redistribution
ESB-2015.3007
Cisco ASR 1000 Series Root Shell License Bypass Vulnerability
3 December 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Aggregation Services Routers (ASR) 1000 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6383
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151130-asa
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Cisco ASR 1000 Series Root Shell License Bypass Vulnerability
Medium
Advisory ID:
cisco-sa-20151130-asa
Published:
2015 November 30 00:00 GMT
Version 1.0:
Final
CVSS Score:
Base - 6.8
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCuv93130
CVE-2015-6383
CWE-264
Summary
A vulnerability in the way software packages are loaded in Cisco IOS XE
Software for the Cisco Aggregation Services Routers (ASR) 1000 Series could
allow an authenticated, local attacker to gain restricted root shell access.
The vulnerability is due to lack of proper input validation of file names at
the command-line interface (CLI). An attacker could exploit this vulnerability
by authenticating to the affected device and crafting specific file names for
use when loading packages. An exploit could allow the authenticated attacker
to bypass the license required for root shell access. If the authenticated
user obtains the root shell access, further compromise is 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-asa
Affected Products
Vulnerable Products
Cisco Aggregation Services Routers (ASR) 1000 Series version 15.4(3)S.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
There are no workarounds that address this vulnerability.
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
Technical Assistance Center (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-asa
Revision History
Version Description Section Status Date
1.0 Initial public release Final 2015-November-30
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.
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