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AUSCERT External Security Bulletin Redistribution
ESB-2018.3003
Cisco IOS XR Software Border Gateway Protocol Denial of
Service Vulnerability
4 October 2018
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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-2018-15428
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-iosxr-dos
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Cisco Security Advisory
Cisco IOS XR Software Border Gateway Protocol Denial of Service Vulnerability
Priroity: Medium
Advisory ID: cisco-sa-20181003-iosxr-dos
First Published: 2018 October 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvj58445
CVE-2018-15428
CWE-20
CVSS Score: Base 6.8
CVSS: 3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
A vulnerability in the implementation of Border Gateway Protocol (BGP)
functionality in Cisco IOS XR Software could allow an unauthenticated,
remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to incorrect processing of certain BGP update
messages. An attacker could exploit this vulnerability by sending BGP
update messages that include a specific, malformed attribute to be
processed by an affected system. A successful exploit could allow the
attacker to cause the BGP process to restart unexpectedly, resulting in a
DoS condition.
The Cisco implementation of BGP accepts incoming BGP traffic only from
explicitly defined peers. To exploit this vulnerability, the malicious BGP
update message would need to come from a configured, valid BGP peer, or
would need to be injected by the attacker into the victim's BGP network on
an existing, valid TCP connection to a BGP peer.
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-20181003-iosxr-dos
Affected Products
* Vulnerable Products
This vulnerability affects Cisco IOS XR Software. For information about
affected software releases, consult the Cisco bug ID(s) at the top of this
advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are 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 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.
URL
* https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-iosxr-dos
Revision History
*
+-----------------------------------------------------------------------------+
| Version | Description | Section | Status | Date |
|----------+---------------------------+----------+--------+------------------|
| 1.0 | Initial public release. | | Final | 2018-October-03 |
+-----------------------------------------------------------------------------+
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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