Description
nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.
Problem types
CWE-20: Improper Input Validation
CWE-190: Integer Overflow or Wraparound
CWE-345: Insufficient Verification of Data Authenticity
CWE-1284: Improper Validation of Specified Quantity in Input
Product status
References
github.com/...atross/security/advisories/GHSA-6973-8887-87ff
github.com/...ommit/d02059053181ed8ddad6b59a0adfd661ef5cd823
github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0