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It appears that most mobile carriers, including O2 and SoftBank, have recovered from yesterday’s cell phone network outage that was triggered by a shutdown of Ericsson equipment running on their networks. That shut down appears to have been triggered by expired software certificates on the equipment itself.
While Ericsson acknowledged in their press release yesterday that expired certificates were at the root of the problem, you may be wondering why this would cause a a shutdown. It turns out that it’s likely due to a fail-safe system in place, says Tim Callan, senior fellow at Sectigo (formerly Comodo CA), a U.S. certificate issuing authority. Callan has 15 years of experience in the industry.
Information - Outage - Industry - Practices - System
He indicated that while he didn’t have specific information on this outage, it would be consistent with industry best practices to shut down the system when encountering expired certificates “We don’t have specific visibility into the Ericsson systems in question, but a typical application would require valid certificates to be in place in order to keep operating. That is to protect against breach by some kind of agent that is maliciously inserted into the network,” Callan told TechCrunch.
In fact, Callan...
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