- Reported
-
- Issued
-
- Package
-
libcrux-hmac-drbg
(crates.io)
- Type
-
Vulnerability
- References
-
- CVSS Score
- 8.2
HIGH
- CVSS Details
-
- Attack Complexity
- Low
- Attack Requirements
- Present
- Attack Vector
- Network
- Privileges Required
- None
- Availability Impact to the Subsequent System
- None
- Confidentiality Impact to the Subsequent System
- None
- Integrity Impact to the Subsequent System
- None
- User Interaction
- None
- Availability Impact to the Vulnerable System
- High
- Confidentiality Impact to the Vulnerable System
- None
- Integrity Impact to the Vulnerable System
- None
- CVSS Vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Patched
-
- Affected Functions
- Version
libcrux_hmac_drbg::HmacDrbgRng::fill_bytes-
Description
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.
Advisory available under CC0-1.0
license.