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AUSCERT External Security Bulletin Redistribution
30 November 2017
AusCERT Security Bulletin Summary
Product: Cisco IOS XR
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2017-12355
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2017 November 29 16:00 GMT
No workarounds available
Cisco Bug IDs:
A vulnerability in the Local Packet Transport Services (LPTS) ingress
frame-processing functionality of Cisco IOS XR Software could allow an
unauthenticated, remote attacker to cause one of the LPTS processes on
an affected system to restart unexpectedly, resulting in a brief
denial of service (DoS) condition.
The vulnerability is due to incomplete LPTS frame validation by the
affected software. An attacker could exploit this vulnerability by
sending crafted XML requests to the management interface of an
affected system. A successful exploit could allow the attacker to
cause one of the LPTS processes on the affected system to restart
unexpectedly, which would impact LPTS traffic and cause a brief DoS
condition while the process restarts.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
At the time of publication, this vulnerability affected all releases
of Cisco IOS XR Software prior to the first fixed release. For the
latest and most detailed 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
There are no workarounds that address this vulnerability. However,
administrators may mitigate this vulnerability by removing the xml
agent command configuration from the running configuration for an
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.
This vulnerability was found during internal security 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.
Version Description Section Status Date
1.0 Initial public release. Final 2017-November-29
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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