Cisco Security Advisory
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AV:L/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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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
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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.
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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.
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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.
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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.
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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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Show LessVersion Description Section Status Date 1.0 Initial public release. NA Final 2015-October-06
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