| id: GO-2022-0209 |
| modules: |
| - module: golang.org/x/crypto |
| versions: |
| - fixed: 0.0.0-20190320223903-b7391e95e576 |
| vulnerable_at: 0.0.0-20190313024323-a1f597ede03a |
| packages: |
| - package: golang.org/x/crypto/salsa20/salsa |
| goarch: |
| - amd64 |
| symbols: |
| - XORKeyStream |
| summary: Insufficiently random values in golang.org/x/crypto/salsa20 |
| description: |- |
| XORKeyStream generates incorrect and insecure output for very large inputs. |
| |
| 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. |
| |
| The issue might affect uses of golang.org/x/crypto/nacl with extremely large |
| messages. |
| |
| Architectures other than amd64 and uses that generate less than 256 GiB of |
| keystream for a single salsa20.XORKeyStream invocation are unaffected. |
| published: 2022-07-01T20:15:25Z |
| cves: |
| - CVE-2019-11840 |
| ghsas: |
| - GHSA-r5c5-pr8j-pfp7 |
| credits: |
| - Michael McLoughlin |
| references: |
| - fix: https://go.dev/cl/168406 |
| - fix: https://go.googlesource.com/crypto/+/b7391e95e576cacdcdd422573063bc057239113d |
| - report: https://go.dev/issue/30965 |
| - web: https://groups.google.com/g/golang-announce/c/tjyNcJxb2vQ/m/n0NRBziSCAAJ |
