test: add an e2e test to reproduce https://nvd.nist.gov/vuln/detail/CVE-2021-28235

Signed-off-by: Benjamin Wang <wachao@vmware.com>

tests/e2e/ctl_v3_auth_security_test.go

@@ -0,0 +1,55 @@
+// Copyright 2023 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !cluster_proxy
+
+package e2e
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestAuth_CVE_2021_28235 verifies https://nvd.nist.gov/vuln/detail/CVE-2021-28235
+func TestAuth_CVE_2021_28235(t *testing.T) {
+	testCtl(t, authTest_CVE_2021_28235, withCfg(*newConfigNoTLS()), withLogLevel("debug"))
+}
+
+func authTest_CVE_2021_28235(cx ctlCtx) {
+	// create root user with root role
+	rootPass := "changeme123"
+	err := ctlV3User(cx, []string{"add", "root", "--interactive=false"}, "User root created", []string{rootPass})
+	require.NoError(cx.t, err)
+	err = ctlV3User(cx, []string{"grant-role", "root", "root"}, "Role root is granted to user root", nil)
+	require.NoError(cx.t, err)
+	err = ctlV3AuthEnable(cx)
+	require.NoError(cx.t, err)
+
+	// issue a put request
+	cx.user, cx.pass = "root", rootPass
+	err = ctlV3Put(cx, "foo", "bar", "")
+	require.NoError(cx.t, err)
+
+	// GET /debug/requests
+	httpEndpoint := cx.epc.procs[0].EndpointsHTTP()[0]
+	req := cURLReq{endpoint: "/debug/requests?fam=grpc.Recv.etcdserverpb.Auth&b=0&exp=1", timeout: 5}
+	respData, err := curl(httpEndpoint, "GET", req, clientNonTLS)
+	require.NoError(cx.t, err)
+
+	if strings.Contains(respData, rootPass) {
+		cx.t.Errorf("The root password is included in the request.\n %s", respData)
+	}
+}

tests/e2e/ctl_v3_test.go

@@ -229,6 +229,12 @@ func withSnapshotCount(snapshotCount int) ctlOption {
 	}
 }
 
+func withLogLevel(logLevel string) ctlOption {
+	return func(cx *ctlCtx) {
+		cx.cfg.logLevel = logLevel
+	}
+}
+
 func testCtl(t *testing.T, testFunc func(ctlCtx), opts ...ctlOption) {
 	testCtlWithOffline(t, testFunc, nil, opts...)
 }