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AUSCERT External Security Bulletin Redistribution
ESB-2016.0028
Cisco IOS XR Software OSPF Link State Advertisement PCE Vulnerability
6 January 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XR Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6432
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160104-iosxr
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Cisco Security Advisory
Cisco IOS XR Software OSPF Link State Advertisement PCE Vulnerability
Medium
Advisory ID:
cisco-sa-20160104-iosxr
Published:
2016 January 4 13:30 GMT
Version 1.0:
Final
CVSS Score:
Base - 5.0
Workarounds:
Yes
Cisco Bug IDs:
CSCuw83486
CVE-2015-6432
CWE-399
A vulnerability in Open Shortest Path First (OSPF) Link State Advertisement
(LSA) handling by Cisco IOS XR Software could allow an unauthenticated, remote
attacker to cause a denial of service (DoS) condition.
The vulnerability is due to the number of OSPF Path Computation Elements
(PCEs) that are configured for an OSPF LSA opaque area update. An attacker
could exploit this vulnerability by sending a crafted OSPF LSA update to an
affected device that is running the vulnerable software and OSPF
configuration. A successful exploit could allow the attacker to cause a DoS
condition due to the OSPF process restarting when the crafted OSPF LSA update
is received.
Cisco has released software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160104-iosxr
Vulnerable Products
Cisco IOS XR Software Releases 4.2.0, 4.3.0, 5.0.0, 5.1.0, 5.2.0, 5.2.2,
5.2.4, 5.3.0, and 5.3.2 are vulnerable.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
This vulnerability will cause the affected device to reload and generate a
core file for the OSPF process. To determine whether the device was
compromised by this vulnerability, the core file should be reviewed by the
Cisco Technical Assistance Center (TAC).
To work around this vulnerability, verify that no more than 10 PCEs are
configured in a single OSPF area.
When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade
solution.
In all cases, customers should ensure that the devices to upgrade 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.
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.
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160104-iosxr
Version Description Section Status Date
1.0 Initial public release. - Final 2016-January-04
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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