CryptoJS Weak RNG Behind $5.7 Million in Drains Affects Five Crypto Wallet Apps - The Hacker News

Coinspect has identified CryptoJS.lib.WordArray.random() as the weak random number generator behind the Ill Bloom wallet drains.

Introduced in the JavaScript cryptography library 12 years ago, the function supplied weak entropy that affected wallet apps used to generate recovery phrases. Coinspect's on-chain analysis puts the measured theft across two sweeps since late May at a lower bound of roughly $5.7 million.

The blockchain security firm, which coined the Ill Bloom name in July, has now confirmed five applications that used the generator as an entropy source for recovery-phrase generation:

Coinspect told The Hacker News that these are the same five wallets it referenced without naming in July.

The firm said the vendor behind the browser extension mentioned in July told it that the extension had been discontinued and was never widely used. Coinspect cautioned that it cannot confirm it identified every vulnerable wallet. Other affected mobile or browser-extension wallets may also have existed but could not be examined because they had already been removed from app stores or extension marketplaces, or because vendors had replaced them with patched releases and the older vulnerable versions were no longer available.