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AUSCERT External Security Bulletin Redistribution
ESB-2017.0900
Cisco ASR 903 and ASR 920 Series Devices IPv6 Packet
Processing Denial of Service Vulnerability
6 April 2017
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AusCERT Security Bulletin Summary
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Product: Cisco ASR 903 and ASR 920 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6603
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170405-asr
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Cisco Security Advisory
Cisco ASR 903 and ASR 920 Series Devices IPv6 Packet Processing Denial of
Service Vulnerability
Medium
Advisory ID:
cisco-sa-20170405-asr
First Published:
2017 April 5 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCuy94366
CVE-2017-6603
CWE-399
CVSS Score:
Base 4.3, Temporal 4.3
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
CVE-2017-6603
CWE-399
Summary
A vulnerability in Cisco ASR 903 or ASR 920 Series Devices running with an
RSP2 card could allow an unauthenticated, adjacent attacker to cause a
denial of service (DoS) condition on a targeted system.
The vulnerability is due to insufficient processing of IPv6 packets by the
affected system. The system could push IPv6 traffic to the processor even
when the device is not configured for IPv6, which could cause other control
packets to be affected. A successful exploit could allow the attacker to
cause a DoS condition on the system.
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-20170405-asr
Affected Products
Vulnerable Products
This vulnerability affects Cisco ASR 903 and ASR 920 Series Devices with an
RSP2 card. 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.
Cisco has confirmed that this vulnerability does not affect Cisco ASR 903
and ASR 920 Series Devices with RSP1 or RSP3.
Indicators of Compromise
Exploitation of this vulnerability could cause high CPU usage.
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 internal testing.
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.
Subscribe to Cisco Security Notifications
Subscribe
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170405-asr
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2017-April-05
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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