The US kept the intelligence highly classified until late last year, when American officials provided details to allies including the UK and Germany, according to officials from the three countries. That was a tactical turnabout by the US, which in the past had argued that it didn't need to produce hard evidence of the threat it says Huawei poses to nations' security.The US has been sharing this evidence at the same time the Trump administration tries to convince allies to get Huawei gear out of their networks.
US officials said they have been aware of Huawei's backdoor access "since observing it in 2009 in early 4G equipment," the Journal wrote. However, the US officials quoted by the Journal "declined to say whether the US has observed Huawei using this access."
Backdoors designed for law enforcement
Telecom-equipment makers who sell products to carriers "are required by law to build into their hardware ways for authorities to access the networks for lawful purposes," but they "are also required to build equipment in such a way that the manufacturer can't get access without the consent of the network operator," the Journal wrote.
US officials say that Huawei has violated these laws, which are enforced in multiple countries, the Journal wrote:
US officials say Huawei has built equipment that secretly preserves the manufacturer's ability to access networks through these interfaces without the carriers' knowledge. The officials didn't provide details of where they believe Huawei is able [to] access networks. Other manufacturers don't have the same ability, they said.
One US official told the Journal that "Huawei does not disclose this covert access to its local customers, or the host nation national-security agencies."
Huawei says it’s not spyingHuawei disputed the latest allegations, as it has done in the past, saying it "has never and will never do anything that would compromise or endanger the security of networks and data of its clients." Huawei also said that the United States made its latest accusations "without providing any kind of concrete evidence."
"No Huawei employee is allowed to access the network without an explicit approval from the network operator," a Huawei official said, according to the Journal.