ether-bn.js @1.4.1

Summary

Package name 'ether-bn.js' resembles the widely-used 'bn.js' big-number library, and the README directs users to install yet another name ('buffernumber.js'). The repository and homepage fields point at the legitimate indutny/bn.js project while the author field is unrelated. The shipped lib/bn.js is a near-verbatim copy of upstream bn.js with two non-upstream additions: a top-level const uniqueString = require('unique-id-64'); (lib/bn.js:38) and a check if (BN.isBN(number) && uniqueString(64)) { return number; } inside the BN constructor (lib/bn.js:20). package.json adds unique-id-64: ^1.0.0 to dependencies. The injected require is unconditionally evaluated when the module is loaded, and uniqueString(64) is invoked on every BN clone path, so any consumer that does new BN(existingBn) executes the third-party unique-id-64 package's code. The injected dependency is unpinned ( ^1.0.0 ) and is not a legitimate transitive of bn.js — it is the payload-delivery vehicle for whatever the third-party package contains now or in the future. Installers expecting bn.js semantics silently take a runtime dependency on attacker-selected code reached through a confusingly-named lookalike package.

Source: amazon-inspector (4cc5567869e3d616af151887f680ef13bf23f8a19fe5978343254b921c1c7c73)