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AUSCERT External Security Bulletin Redistribution
ESB-2017.2504
Cisco IOS XR Software Denial of Service Vulnerability
5 October 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Network Convergence System 5500 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-12270
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-ncs
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Cisco IOS XR Software Denial of Service Vulnerability
Medium
Advisory ID:
cisco-sa-20171004-ncs
First Published:
2017 October 4 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvb99388
CVSS Score:
Base 5.3
CVE-2017-12270
CWE-119
Summary
A vulnerability in the gRPC code of Cisco IOS XR Software for Cisco Network
Convergence System (NCS) 5500 Series Routers could allow an unauthenticated,
remote attacker to cause a denial of service (DoS) condition when the emsd
service stops.
The vulnerability is due to the software's inability to process HTTP/2
packets. An attacker could exploit this vulnerability by sending a malformed
HTTP/2 frame to the affected device. A successful exploit could allow the
attacker to create a DoS condition when the emsd service stops.
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-20171004-ncs
Affected Products
Vulnerable Products
This vulnerability affects Cisco Network Convergence System (NCS) 5500 Series
Routers that are running Cisco IOS XR Software with gRPC enabled.
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 internal testing.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-ncs
Revision History
Version Description Section Status Date
1.0 Initial public release. - Final 2017-October-04
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