https://www.vice.com/en_us/article/k78q5y/signal-ceo-hacks-cellebrite-iphone-hacking-device-used-by-cops

Moxie Marlinspike, the founder of the popular encrypted chat app Signal claims to have hacked devices made by the infamous phone unlocking company Cellebrite, which has famously worked with cops to circumvent encryption such as Signal's. In a blog post Wednesday, Marlinspike not only published details new exploits for Cellebrite devices but seemed to suggest that Signal's code could be theoretically altered to hack Cellebrite devices en masse.

"We were surprised to find that very little care seems to have been given to Cellebrite’s own software security. Industry-standard exploit mitigation defenses are missing, and many opportunities for exploitation are present," Marlinspike wrote in the post. "Any app could contain such a file, and until Cellebrite is able to accurately repair all vulnerabilities in its software with extremely high confidence, the only remedy a Cellebrite user has is to not scan devices."