ESB-2017.2245 - [Cisco] Cisco ASR 5500 System Architecture Evolution Gateway: Denial of service - Remote/unauthenticated 2017-09-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2245
         Cisco ASR 5500 System Architecture Evolution Gateway GPRS
            Tunneling Protocol Denial of Service Vulnerability
                             7 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco ASR 5500 System Architecture Evolution Gateway
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12217  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-asr

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Cisco ASR 5500 System Architecture Evolution Gateway GPRS Tunneling Protocol 
Denial of Service Vulnerability

Medium

Advisory ID: cisco-sa-20170906-asr

First Published: 2017 September 6 16:00 GMT

Version 1.0: Final

Workarounds: No workarounds available

Cisco Bug IDs:

CSCve07119

CVSS Score:

Base 5.8

Base 5.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:X/RL:X/RC:X

CVE-2017-12217

CWE-20

Summary

A vulnerability in the General Packet Radio Service (GPRS) Tunneling Protocol
ingress packet handler of Cisco ASR 5500 System Architecture Evolution (SAE) 
Gateways could allow an unauthenticated, remote attacker to cause a partial 
denial of service (DoS) condition on an affected device.

The vulnerability is due to improper input validation of GPRS Tunneling 
Protocol packet headers. An attacker could exploit this vulnerability by 
sending a malformed GPRS Tunneling Protocol packet to an affected device. A 
successful exploit could allow the attacker to cause the GTPUMGR process on an
affected device to restart unexpectedly, resulting in a partial DoS condition.
If the GTPUMGR process restarts, there could be a brief impact on traffic 
passing through the device.

There are no workarounds that address this vulnerability.

This advisory is available at the following link:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-asr

Affected Products

Vulnerable Products

This vulnerability affects Cisco ASR 5500 System Architecture Evolution (SAE)
Gateways that are running a software release prior to the first fixed release
and are configured to use the GPRS Tunneling Protocol. For information about 
affected software releases, consult the Cisco bug ID(s) at the top of this 
advisory.

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

For information about fixed software releases, consult the Cisco bug ID(s) at
the top of this advisory.

When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, 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.

Source

This vulnerability was found during the resolution of a Cisco TAC support 
case.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-asr

Revision History

Version Description 		Section Status 	Date

1.0 	Initial public release. -	Final 	2017-September-06

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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