How A Cheap Barcode Scanner Helped Fix A Company's CrowdStrike'd Windows PCs

An anonymous Slashdot reader shared this report from the Register:Not long after Windows PCs and servers at the Australian limb of audit and tax advisory Grant Thornton started BSODing last Friday, senior systems engineer Rob Woltz remembered a small but important fact: When PCs boot, they consider barcode scanners no differently to keyboards. That knowledge nugget became important as the firm tried to figure out how to respond to the mess CrowdStrike created, which at Grant Thornton Australia threw hundreds of PCs and no fewer than 100 servers into the doomloop that CrowdStrike's shoddy testing software made possible. [...] The firm had the BitLocker keys for all its PCs, so Woltz and colleagues wrote a script that turned them into barcodes that were displayed on a locked-down management server's desktop. The script would be given a hostname and generate the necessary barcode and LAPS password to restore the machine. Woltz went to an office supplies store and acquired an off-the-shelf barcode scanner for AU$55 ($36). At the point when rebooting PCs asked for a BitLocker key, pointing the scanner at the barcode on the server's screen made the machines treat the input exactly as if the key was being typed. That's a lot easier than typing it out every time, and the server's desktop could be accessed via a laptop for convenience. Woltz, Watson, and the team scaled the solution - which meant buying more scanners at more office supplies stores around Australia. On Monday, remote staff were told to come to the office with their PCs and visit IT to connect to a barcode scanner. All PCs in the firm's Australian fleet were fixed by lunchtime - taking only three to five minutes for each machine. Watson told us manually fixing servers needed about 20 minutes per machine.

Read more of this story at Slashdot.