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Category:   Device (Embedded Server/Appliance)  >   Cisco Unified Computing System Vendors:   Cisco
(Cisco Issues Advisory for Cisco Unified Computing System) Intel/AMD/ARM CPU Data Cache Race Conditions Let Local Users Read Arbitrary Virtual CPU Memory
SecurityTracker Alert ID:  1040112
SecurityTracker URL:  http://securitytracker.com/id/1040112
CVE Reference:   CVE-2017-5715, CVE-2017-5753, CVE-2017-5754   (Links to External Site)
Date:  Jan 6 2018
Impact:   Disclosure of system information
Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   Several vulnerabilities were reported in Intel, AMD, and ARM CPUs. A local user can read arbitrary virtual memory on the target CPU device. Cisco Unified Computing System is affected.

A local user can exploit race conditions in CPU data cache processing to obtain potentially sensitive information on the target system. This can be exploited to read arbitrary virtual memory on the target system, including by a local user on a guest operating system of a virtual machine to read arbitrary memory from other guest systems, the host operating system, and the hypervisor.

In certain cases, a local user can run a specially crafted application to exploit several flaws in the CPU speculative branch instruction execution feature and leverage CPU data cache timing behavior to infer information or read information from various CPU caches.

A local user that can trigger an out-of-bounds index error in an application can read data from another process from the CPU virtual memory [CVE-2017-5753]. The eBPF interpreter or the eBPF JIT engine can be used to create vulnerable code.

A local user can run specially crafted code to cause the CPU to speculatively execute an indirect branch to leak memory contents from another process into a CPU cache and then read the contents of the cache [CVE-2017-5715].

A local user can run specially crafted code to cause the CPU to read memory from a CPU cache before an asynchronous permission check occurs [CVE-2017-5754]. AMD CPUs are reportedly not affected.

The Intel Core, Xeon, Atom, Celeron, and Pentium product lines are affected.

CPUs from AMD and ARM are also affected.

CPUs from other vendors may also affected.

The CVE-2017-5753 and CVE-2017-5715 vulnerabilities are referred to as "Spectre".

The CVE-2017-5754 vulnerability is referred to as "Meltdown".

The original advisories are available at:

https://spectreattack.com/spectre.pdf
https://meltdownattack.com/meltdown.pdf
https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html

Paul Kocher, Daniel Genkin, Daniel Gruss, Werner Haas, Mike Hamburg, Moritz Lipp, Stefan Mangard, Thomas Prescher, Michael Schwarz, Yuval Yarom, Anders Fogh, Jann Horn, the Google Project Zero Team, and others reported these vulnerabilities.

Impact:   A local user can view arbitrary virtual memory contents on the target CPU device [which can lead to elevated privileges on the target system].
Solution:   No solution was available at the time of this entry.

The following Cisco UCS models are affected:

B-Series M4 Blade Servers (except B260, B460)
B-Series M5 Blade Servers
B260 M4 Blade Server
B460 M4 Blade Server
C-Series M2 Rack Servers
C-Series M3 Rack Servers
C-Series M4 Rack Servers (except C460)
C-Series M5 Rack Servers
C460 M4 Rack Server

Cisco has assigned Bug IDs CSCvg97965, CSCvg97979, CSCvg98015, CSCvg98015, CSCvh31576, and CSCvh31577 to this vulnerability.

The Cisco advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180104-cpusidechannel

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180104-cpusidechannel (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Jan 4 2018 Intel/AMD/ARM CPU Data Cache Race Conditions Let Local Users Read Arbitrary Virtual CPU Memory



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