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AUSCERT External Security Bulletin Redistribution
ESB-2018.2905
Cisco Catalyst 6800 Series Switches ROM Monitor Software
Secure Boot Bypass Vulnerability
27 September 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Catalyst 6800 Series Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Console/Physical
Resolution: Patch/Upgrade
CVE Names: CVE-2018-15370
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-catalyst6800
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Cisco Security Advisory
Cisco Catalyst 6800 Series Switches ROM Monitor Software Secure Boot Bypass
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20180926-catalyst6800
First Published: 2018 September 26 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvc16091
CVE-2018-15370
CWE-264
CVSS Score: Base 6.4
CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
* A vulnerability in Cisco IOS ROM Monitor (ROMMON) Software for
Cisco Catalyst 6800 Series Switches could allow an unauthenticated, local
attacker to bypass Cisco Secure Boot validation checks and load a
compromised software image on an affected device.
The vulnerability is due to the presence of a hidden command in the
affected software. An attacker could exploit this vulnerability by
connecting to an affected device via the console, forcing the device into
ROMMON mode, and writing a malicious pattern to a specific memory address
on the device. A successful exploit could allow the attacker to bypass
signature validation checks by Cisco Secure Boot technology and load a
compromised software image on the affected device. A compromised software
image is any software image that has not been digitally signed by Cisco.
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-20180926-catalyst6800
Affected Products
* Vulnerable Products
This vulnerability affects the following Cisco devices if they are running
a vulnerable release of Cisco IOS ROMMON Software:
+ Catalyst 6800 Series Supervisor Engine 6T
+ Catalyst 6840-X Series Fixed Backbone Switches
+ Catalyst 6880-X Series Extensible Fixed Aggregation Switches
For information about affected software releases, consult the Cisco bug ID
(s) at the top of this advisory.
Determining the Cisco IOS ROMMON Software Release
To determine which Cisco IOS ROMMON Software release is running on a
device, administrators can log in to the device and use the show version |
include ROM: command in the CLI. The following example shows the output of
the command for a device that is running Cisco IOS ROMMON Software Release
15.1(02)SY01:
switch# show version | include ROM:
ROM: System Bootstrap, Version 15.1(02)SY01 [ Rel 1.1], RELEASE SOFTWARE
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.
Subscribe to Cisco Security Notifications
* Subscribe
URL
* https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-catalyst6800
Revision History
+----------------------------------------------------------------------------+
| Version | Description | Section | Status | Date |
|---------+--------------------------+---------+--------+--------------------|
| 1.0 | Initial public release. | | Final | 2018-September-26 |
+----------------------------------------------------------------------------+
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.
- --------------------------END INCLUDED TEXT--------------------
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