Entropy Backdoor in text-qrcode

2020-09-01T21:22:35
ID GHSA-H5VJ-F7R9-W564
Type github
Reporter GitHub Advisory Database
Modified 2021-10-01T13:30:19

Description

All versions of text-qrcode contain malicious code that overwrites the randomBytes method for the crypto module with a function that generates weak entropy. Instead of generating 32 bytes, the infected randomBytes will generate 3 bytes of entropy and hash them, resulting in a 32 byte value being returned, but one that is easily guessable.

Recommendation

Uninstall text-qrcode immediately. If the module was used to generate entropy that is load bearing, all such instances of generated entropy must be replaced. This includes things like bitcoin wallets, private keys, encrypted messages, etc.