Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2017.1097
Cisco IOS XR Software Denial of Service Vulnerability
4 May 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XR
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-3876
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-ios-xr
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Cisco Security Advisory: Cisco IOS XR Software Denial of Service Vulnerability
Advisory ID: cisco-sa-20170503-ios-xr
Revision: 1.0
For Public Release: 2017 May 3 16:00 GMT
Last Updated: 2017 May 3 16:00 GMT
CVE ID(s): CVE-2017-3876
CVSS Score v(3): 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
+---------------------------------------------------------------------
Summary
=======
A vulnerability in the Event Management Service daemon (emsd)
of Cisco IOS XR routers, could allow an unauthenticated, remote attacker to
cause a denial of service (DoS) condition on the affected device.
The vulnerability is due to improper handling of gRPC requests. An attacker
could exploit this vulnerability by repeatedly sending unauthenticated gRPC
requests to the affected device. A successful exploit could allow the attacker
to crash the device in such a manner that manual intervention is required to
recover.
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-ios-xr
["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-ios-xr"]
- -----BEGIN PGP SIGNATURE-----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 =rSpI
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=iBi7
-----END PGP SIGNATURE-----