golang.org/x/crypto/salsa20/salsa uses insufficiently random values
Moderate severity
GitHub Reviewed
Published
May 24, 2022
to the GitHub Advisory Database
•
Updated Sep 29, 2023
Package
Affected versions
< 0.0.0-20190320223903-b7391e95e576
Patched versions
0.0.0-20190320223903-b7391e95e576
Description
Published by the National Vulnerability Database
May 9, 2019
Published to the GitHub Advisory Database
May 24, 2022
Reviewed
Feb 8, 2023
Last updated
Sep 29, 2023
An issue was discovered in supplementary Go cryptography libraries, aka golang-googlecode-go-crypto, before 2019-03-20. A flaw was found in the amd64 implementation of golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.
Specific Go Packages Affected
golang.org/x/crypto/salsa20/salsa
References