High, CVSS 8.2crates.ioAmendedPublished
Auto-Reseeding HMAC-DRBG could panic for some output lengths
- Affected
- crates.io libcrux-hmac-drbg >= 0.0.0-0, < 0.0.2
- Fixed in
- 0.0.2· Vendor fix available
- Issue
- The automatically reseeding implementations of HMAC-DRBG would panic if called with a desired non-zero output length cleanly divisible by `65_536`, the maximum number of output bytes that can be generated before reseeding has to happen. Impact An application relying on `libcrux-hmac-drgb` to provide randomness of byte length a non-zero integer multiple of `65_536` in a single call to `fill_bytes` would panic. Any calls with output buffer lengths not cleanly divisible by `65_536` are not affected. Mitigation With release the release of version `0.0.2` of `libcrux-hmac-drbg` this bug has been fixed and reseeding DRBG implementations can be used with arbitrary output lengths. We recommend users upgrade to `libcrux-hmac-drbg` version `0.0.2`.
Recommended action: Upgrade to 0.0.2 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.