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AUSCERT External Security Bulletin Redistribution
ESB-2019.2028
Cisco Unified Computing System BIOS Signature Bypass Vulnerability
6 June 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Unified Computing System
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1880
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190605-ucs-biossig-bypass
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Cisco Unified Computing System BIOS Signature Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190605-ucs-biossig-bypass
First Published: 2019 June 5 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvp12824 CSCvp12840
CVE-2019-1880
CWE-345
CVSS Score:
4.4 AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the BIOS upgrade utility of Cisco Unified Computing
System (UCS) C-Series Rack Servers could allow an authenticated, local
attacker to install compromised BIOS firmware on an affected device.
The vulnerability is due to insufficient validation of the firmware image
file. An attacker could exploit this vulnerability by executing the BIOS
upgrade utility with a specific set of options. A successful exploit could
allow the attacker to bypass the firmware signature-verification process
and install compromised BIOS firmware on an affected device.
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-20190605-ucs-biossig-bypass
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products:
UCS C125 M5 Rack Server Node
UCS C220 M4 Rack Server
UCS C220 M5 Rack Server
UCS C240 M4 Rack Server
UCS C240 M5 Rack Server
UCS C460 M4 Rack Server
UCS C480 M5 Rack Server
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
o There are no workarounds that address this vulnerability.
Fixed Software
o 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
o 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
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o 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
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190605-ucs-biossig-bypass
Revision History
o +---------+---------------------------+---------+--------+---------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+---------+--------+---------------+
| 1.0 | Initial public release. | - | Final | 2019-June-05 |
+---------+---------------------------+---------+--------+---------------+
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