Codecov hackers breached hundreds of restricted customer sites: sources

FILE PHOTO: A man holds a laptop computer as cyber code is projected on him in this illustration picture taken on May 13, 2017. REUTERS/Kacper Pempel/Illustration

SAN FRANCISCO (Reuters) - Hackers who tampered with a software development tool from a company called Codecov used that program to gain restricted access to hundreds of networks belonging to the San Francisco firm's customers, investigators told Reuters.

Codecov makes software auditing tools that allow developers to see how thoroughly their own code is being tested, a process that can give the tool access to stored credentials for various internal software accounts.