[Security Advisory] CVE 2019-6260: Unsecured ASPEED AHB Bridges

[Joseph Reynolds]

The OpenBMC Security Response team has released an OpenBMC Security 
Advisory:
https://github.com/openbmc/openbmc/issues/3475

An OpenBMC Security Advisory explains a security vulnerability, its 
severity, and how to protect systems that are built on OpenBMC.
For more information about OpenBMC Security Response, see:
https://github.com/openbmc/docs/blob/master/security/obmc-security-response-team.md

For general information about OpenBMC Security, see the Security Working 
Group wiki:
https://github.com/openbmc/openbmc/wiki/Security-working-group