Description
Fulcio is a free-to-use certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.3, function identity.extractIssuerURL splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request with an (invalid) OIDC identity token in the payload containing many period characters, a call to extractIssuerURL incurs allocations to the tune of O(n) bytes (where n stands for the length of the function's argument), with a constant factor of about 16. This vulnerability is fixed in 1.8.3.
Problem types
CWE-405: Asymmetric Resource Consumption (Amplification)
Product status
References
github.com/...fulcio/security/advisories/GHSA-f83f-xpx7-ffpw
github.com/...ommit/765a0e57608b9ef390e1eeeea8595b9054c63a5a
