GO-2022-0213

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GO-2022-0213

Summary: Panic on invalid DSA public keys in crypto/dsa

Details: Invalid DSA public keys can cause a panic in dsa.Verify. In particular, using crypto/x509.Verify on a crafted X.509 certificate chain can lead to a panic, even if the certificates don't chain to a trusted root. The chain can be delivered via a crypto/tls connection to a client, or to a server that accepts and verifies client certificates. net/http clients can be made to crash by an HTTPS server, while net/http servers that accept client certificates will recover the panic and are unaffected. Moreover, an application might crash invoking crypto/x509.(*CertificateRequest).CheckSignature on an X.509 certificate request, parsing a golang.org/x/crypto/openpgp Entity, or during a golang.org/x/crypto/otr conversation. Finally, a golang.org/x/crypto/ssh client can panic due to a malformed host key, while a server could panic if either PublicKeyCallback accepts a malformed public key, or if IsUserAuthority accepts a certificate with a malformed public key.

References: https://go.dev/cl/205441, https://go.googlesource.com/go/+/552987fdbf4c2bc9641016fd323c3ae5d3a0d9a3, https://go.dev/issue/34960, https://groups.google.com/g/golang-announce/c/lVEm7llp0w0/m/VbafyRkgCgAJ