CVE-2019-11840 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=1691529 https://github.com/golang/go/issues/30965 https://go.googlesource.com/crypto/+/b7391e95e576cacdcdd422573063bc057239113d https://groups.google.com/forum/!msg/golang-announce/tjyNcJxb2vQ/n0NRBziSCAAJ https://lists.debian.org/debian-lts-announce/2019/06/msg00029.html https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html https://lists.debian.org/debian-lts-announce/2020/11/msg00016.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9