CVE-2024-23897

@@ -26,6 +26,7 @@
 
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import hudson.AbortException;
 import hudson.Extension;
 import hudson.ExtensionList;
@@ -51,6 +52,7 @@
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import jenkins.model.Jenkins;
+import jenkins.util.SystemProperties;
 import org.apache.commons.discovery.ResourceClassIterator;
 import org.apache.commons.discovery.ResourceNameIterator;
 import org.apache.commons.discovery.resource.ClassLoaders;
@@ -62,6 +64,7 @@
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.kohsuke.args4j.CmdLineException;
 import org.kohsuke.args4j.CmdLineParser;
+import org.kohsuke.args4j.ParserProperties;
 import org.kohsuke.args4j.spi.OptionHandler;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.authentication.BadCredentialsException;
@@ -107,6 +110,16 @@
  */
 @LegacyInstancesAreScopedToHudson
 public abstract class CLICommand implements ExtensionPoint, Cloneable {
+
+    /**
+     * Boolean values to either allow or disallow parsing of @-prefixes.
+     * If a command line value starts with @, it is interpreted as being a file, loaded,
+     * and interpreted as if the file content would have been passed to the command line
+     */
+    @SuppressFBWarnings(value = "MS_SHOULD_BE_FINAL", justification = "Accessible via System Groovy Scripts")
+    @Restricted(NoExternalUse.class)
+    public static boolean ALLOW_AT_SYNTAX = SystemProperties.getBoolean(CLICommand.class.getName() + ".allowAtSyntax");
+
     /**
      * Connected to stdout and stderr of the CLI agent that initiated the session.
      * IOW, if you write to these streams, the person who launched the CLI command
@@ -307,7 +320,8 @@ private void logAndPrintError(Throwable e, String errorMessage, String logMessag
      * @since 1.538
      */
     protected CmdLineParser getCmdLineParser() {
-        return new CmdLineParser(this);
+        ParserProperties properties = ParserProperties.defaults().withAtSyntax(ALLOW_AT_SYNTAX);
+        return new CmdLineParser(this, properties);
     }
 
     /**

@@ -59,6 +59,7 @@
 import org.jvnet.localizer.ResourceBundleHolder;
 import org.kohsuke.args4j.CmdLineException;
 import org.kohsuke.args4j.CmdLineParser;
+import org.kohsuke.args4j.ParserProperties;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.authentication.BadCredentialsException;
 import org.springframework.security.core.Authentication;
@@ -131,7 +132,8 @@ protected CmdLineParser getCmdLineParser() {
                         private CmdLineParser bindMethod(List<MethodBinder> binders) {
 
                             registerOptionHandlers();
-                            CmdLineParser parser = new CmdLineParser(null);
+                            ParserProperties properties = ParserProperties.defaults().withAtSyntax(ALLOW_AT_SYNTAX);
+                            CmdLineParser parser = new CmdLineParser(null, properties);
 
                             //  build up the call sequence
                             Stack<Method> chains = new Stack<>();

@@ -0,0 +1,55 @@
+package jenkins.security;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.not;
+
+import hudson.cli.CLICommandInvoker;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.List;
+import jenkins.model.Jenkins;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.jvnet.hudson.test.JenkinsRule;
+
+@RunWith(Parameterized.class)
+public class Security3314Test {
+    private String commandName;
+
+    @Rule
+    public final JenkinsRule j = new JenkinsRule();
+
+    /**
+     * connect-node to test the CLICommand behavior
+     * disable-job to test the CLIRegisterer behavior (@CLIMethod)
+     */
+    @Parameterized.Parameters
+    public static List<String> commands() {
+        return Arrays.asList("connect-node", "disable-job");
+    }
+
+    public Security3314Test(String commandName) {
+        this.commandName = commandName;
+    }
+
+    @Test
+    public void commandShouldNotParseAt() throws Exception {
+        CLICommandInvoker command = new CLICommandInvoker(j, commandName);
+
+        Path tempPath = Files.createTempFile("tempFile", ".txt");
+        tempPath.toFile().deleteOnExit();
+        String content = "AtGotParsed";
+        Files.write(tempPath, content.getBytes());
+
+        final CLICommandInvoker.Result result = command
+                .authorizedTo(Jenkins.READ)
+                .invokeWithArgs("@" + tempPath);
+
+        assertThat(result.stderr(), containsString("@" + tempPath));
+        assertThat(result.stderr(), not(containsString("AtGotParsed")));
+    }
+}