Headline
CVE-2023-43809: Release v0.6.2 · charmbracelet/soft-serve
Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the allow-keyless setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version v0.6.2 to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the allow-keyless setting.
Changelog****Bug fixes
- 407c4ec: fix(ssh): add authentication middleware (@aymanbagabas)
Dependency updates
- d6b6f7c: feat(deps): bump github.com/hashicorp/golang-lru/v2 from 2.0.6 to 2.0.7 (#392) (@dependabot[bot])
- 53832a9: feat(deps): bump github.com/prometheus/client_golang (@dependabot[bot])
- 6f0a418: feat(deps): bump modernc.org/sqlite from 1.25.0 to 1.26.0 (#391) (@dependabot[bot])
Verifying the artifacts
First, download the checksums.txt file, for example, with wget:
wget ‘https://github.com/charmbracelet/soft-serve/releases/download/v0.6.2/checksums.txt’
Then, verify it using cosign:
cosign verify-blob \ –certificate-identity ‘https://github.com/charmbracelet/meta/.github/workflows/goreleaser.yml@refs/heads/main’ \ –certificate-oidc-issuer ‘https://token.actions.githubusercontent.com’ \ –cert ‘https://github.com/charmbracelet/soft-serve/releases/download/v0.6.2/checksums.txt.pem’ \ –signature ‘https://github.com/charmbracelet/soft-serve/releases/download/v0.6.2/checksums.txt.sig’ \ ./checksums.txt
If the output is Verified OK, you can safely use it to verify the checksums of other artifacts you downloaded from the release using sha256sum:
sha256sum --ignore-missing -c checksums.txt
Done! You artifacts are now verified!
Thoughts? Questions? We love hearing from you. Feel free to reach out on Twitter, The Fediverse, or on Discord.