GHSA-gxhx-2686-5h9gMedium▾ Sunlitslack-go `SecretsVerifier` accepts empty signing secret without precondition
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
SecretsVerifier in slack-go/slack before v0.23.1 accepts an empty signing secret without error. If an application is misconfigured (e.g., an unset or empty SLACK_SIGNING_SECRET), NewSecretsVerifier builds an HMAC-SHA256 keyed with an empty string, allowing an unauthenticated attacker to forge a valid X-Slack-Signature and bypass Slack request authentication. Fixed in v0.23.1, which rejects empty secrets with ErrInvalidConfiguration. This is patched in version 0.23.1.
github.com/slack-go/slack < 0.23.1Upgrade to a patched release:
github.com/slack-go/slack 0.23.1Connected by shared product, vendor, weakness, or advisory.