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AUSCERT External Security Bulletin Redistribution
ESB-2015.2564
Cisco UCS B-Series Blade Servers Denial of Service Vulnerability
9 October 2015
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AusCERT Security Bulletin Summary
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Product: Cisco UCS B-Series Blade Servers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4265
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-ucs
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Cisco Security Advisory
Cisco UCS B-Series Blade Servers Denial of Service Vulnerability
Medium
Advisory ID: cisco-sa-20151006-ucs
Published: 2015 October 6 21:00 GMT
Version 1.0: Final
CVSS Score: Base - 4.9
Workarounds: Yes
Cisco Bug IDs: CSCuq77241 CVE-2015-4265 CWE-399
Summary
A vulnerability in Cisco Unified Computing System (UCS) B-Series blade
servers could allow an unauthenticated, local attacker to cause the host
operating system or Baseboard Management Controller (BMC) to hang.
The vulnerability is due to how the various components communicate across
the Inter-IC (I2C) bus. An attacker could exploit this vulnerability by
sending specific I2C packets. An exploit could allow the attacker to cause
disruption to the host, resulting in a denial of service (DoS) condition.
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-20151006-ucs
Affected Products
Vulnerable Products
The following Cisco UCS B-Series blade servers running Cisco UCS B-Series
Blade Server Software prior to release 2.2.6 are vulnerable:
Cisco UCS B200 M3 Blade Server
Cisco UCS B420 M3 Blade Server
Cisco UCS B22 M3 Blade Server
Cisco UCS B260 M4 Blade Server
Cisco UCS B460 M4 Blade Server
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
If connection to the Cisco Integrated Management Controller (CIMC) is
alive, resetting the blade power will recover the blade. If CIMC is in a
unresponsive "hanging" state or resetting blade power does not resolve the
issue, resetting the slot will recover the blade.
Fixed Software
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 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.
URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-ucs
Revision History
Version Description Section Status Date
1.0 Initial public release. NA Final 2015-October-06
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.
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