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CVE-2019-11840

golang.org/x/crypto/salsa20/salsa uses insufficiently random values

Impact

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

Affected packages

EcosystemPackageAffectedFixed in
gogolang.org/x/crypto< 0.0.0-20190320223903-b7391e95e5760.0.0-20190320223903-b7391e95e576

Affected products

VendorProductAffected versions
GolangCrypto
All versions
DebianDebian Linux
Versions 8.0, 9.0, 10.0

Weakness classification

CWE-330

References