CVE-2021-43289 (published 2022-04-14T13:15Z)

An issue was discovered in ThoughtWorks GoCD before 21.3.0. An attacker who has compromised a GoCD agent can upload a malicious file into an arbitrary directory of a GoCD server, but does not control the filename.

Severity: MEDIUM
CVSS v2 base score: 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N)
CVSS v3 base score: 7.5, HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

Weakness information:
cwe_id: CWE-22
cwe_name: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
description: The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
extended_description: 
            Many file operations are intended to take place within a restricted directory. By using special elements such as ".." and "/" separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the "../" sequence, which in most modern operating systems is interpreted as the parent directory of the current location. This is referred to as relative path traversal. Path traversal also covers the use of absolute pathnames such as "/usr/local/bin" to access unexpected files. This is referred to as absolute path traversal.
         
         

Fix information:
repo_url: https://github.com/gocd/gocd
commit_details: repo_url: https://github.com/gocd/gocd
author: Aravind SV
author_date: 2021-10-25 10:36:33+01:00
msg: #000 - Validate stage counter in GETs as well.

Continuation of commit c22e0428164af
repository: repo_url: https://github.com/gocd/gocd
repo_name: gocd/gocd
description: GoCD - Continuous Delivery server main repository
repo_language: Java
owner: gocd
file_changes: filename: ArtifactsController.java
change_type: ModificationType.MODIFY
diff: @@ -259,6 +259,10 @@ public class ArtifactsController {
     ) {
         start = start == null ? 0L : start;
 
+        if (!isValidStageCounter(stageCounter)) {
+            return buildNotFound(pipelineName, pipelineCounter, stageName, stageCounter, buildName);
+        }
+
         try {
             JobIdentifier identifier = restfulService.findJob(pipelineName, pipelineCounter, stageName, stageCounter, buildName);
             if (jobInstanceDao.isJobCompleted(identifier) && !consoleService.doesLogExist(identifier)) {
@@ -281,6 +285,11 @@ public class ArtifactsController {
 
     ModelAndView getArtifact(String filePath, ArtifactFolderViewFactory folderViewFactory, String pipelineName, String counterOrLabel, String stageName, String stageCounter, String buildName, String sha, String serverAlias) throws Exception {
         LOGGER.info("[Artifact Download] Trying to resolve '{}' for '{}/{}/{}/{}/{}'", filePath, pipelineName, counterOrLabel, stageName, stageCounter, buildName);
+
+        if (!isValidStageCounter(stageCounter)) {
+            return buildNotFound(pipelineName, counterOrLabel, stageName, stageCounter, buildName);
+        }
+
         long before = System.currentTimeMillis();
         ArtifactsView view;
         //Work out the job that we are trying to retrieve

programming_language: Java
filename: ArtifactsControllerTest.java
change_type: ModificationType.MODIFY
diff: @@ -136,6 +136,18 @@ public class ArtifactsControllerTest {
         assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
     }
 
+    @Test
+    void shouldFailToGetConsoleOutWhenStageCounterIsNotAPositiveInteger() throws Exception {
+        ModelAndView modelAndView = artifactsController.consoleout("pipeline-1", "1", "stage-1", "job-1", "NOT_AN_INTEGER", 122L);
+        assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
+    }
+
+    @Test
+    void shouldFailToGetArtifactWhenStageCounterIsNotAPositiveInteger() throws Exception {
+        ModelAndView modelAndView = artifactsController.getArtifactAsHtml("pipeline-1", "1", "stage-1",  "NOT_AN_INTEGER", "job-1", "some-path", "sha1", "alias");
+        assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
+    }
+
     @Test
     public void shouldFunnelAll_GET_calls() throws Exception {
         final ModelAndView returnVal = new ModelAndView();

programming_language: Java
repo_url: https://github.com/gocd/gocd
commit_details: repo_url: https://github.com/gocd/gocd
author: Aravind SV
author_date: 2021-10-22 12:37:28+01:00
msg: #000 - Validate stage counter during upload artifacts
repository: repo_url: https://github.com/gocd/gocd
repo_name: gocd/gocd
description: GoCD - Continuous Delivery server main repository
repo_language: Java
owner: gocd
file_changes: filename: ArtifactsController.java
change_type: ModificationType.MODIFY
diff: @@ -33,6 +33,7 @@ import com.thoughtworks.go.server.web.FileModelAndView;
 import com.thoughtworks.go.server.web.ResponseCodeView;
 import com.thoughtworks.go.util.ArtifactLogUtil;
 import com.thoughtworks.go.util.SystemEnvironment;
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -149,6 +150,9 @@ public class ArtifactsController {
         if (!headerConstraint.isSatisfied(request)) {
             return ResponseCodeView.create(HttpServletResponse.SC_BAD_REQUEST, "Missing required header 'Confirm'");
         }
+        if (!isValidStageCounter(stageCounter)) {
+            return buildNotFound(pipelineName, pipelineCounter, stageName, stageCounter, buildName);
+        }
         try {
             jobIdentifier = restfulService.findJob(pipelineName, pipelineCounter, stageName, stageCounter,
                     buildName, buildId);
@@ -224,6 +228,10 @@ public class ArtifactsController {
             return FileModelAndView.forbiddenUrl(filePath);
         }
 
+        if (!isValidStageCounter(stageCounter)) {
+            return buildNotFound(pipelineName, pipelineCounter, stageName, stageCounter, buildName);
+        }
+
         JobIdentifier jobIdentifier;
         try {
             jobIdentifier = restfulService.findJob(pipelineName, pipelineCounter, stageName, stageCounter, buildName, buildId);
@@ -341,4 +349,17 @@ public class ArtifactsController {
         String notFound = String.format("Console log for %s is unavailable as it may have been purged by Go or deleted externally.", identifier.toFullString());
         return ResponseCodeView.create(SC_NOT_FOUND, notFound);
     }
+
+    private boolean isValidStageCounter(String stageCounter) {
+        if (StringUtils.isEmpty(stageCounter)) {
+            return true;
+        }
+
+        try {
+            int value = Integer.parseInt(stageCounter);
+            return value > 0;
+        } catch (Exception e) {
+            return false;
+        }
+    }
 }

programming_language: Java
filename: ArtifactsControllerTest.java
change_type: ModificationType.MODIFY
diff: @@ -39,6 +39,7 @@ import java.io.InputStream;
 
 import static com.thoughtworks.go.util.GoConstants.*;
 import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
+import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
 import static org.hamcrest.Matchers.*;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.mockito.Mockito.any;
@@ -120,6 +121,21 @@ public class ArtifactsControllerTest {
         assertThat(view.getContent(), is("Error saving checksum file for the artifact at path 'some-path'"));
     }
 
+    @Test
+    void shouldFailToPostAndPutWhenStageCounterIsNotAPositiveInteger() throws Exception {
+        ModelAndView modelAndView = artifactsController.postArtifact("pipeline-1", "1", "stage-1", "NOT_AN_INTEGER", "job-1", 122L, "some-path", 1, null);
+        assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
+
+        modelAndView = artifactsController.postArtifact("pipeline-1", "1", "stage-1", "-123", "job-1", 122L, "some-path", 1, null);
+        assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
+
+        modelAndView = artifactsController.putArtifact("pipeline-1", "1", "stage-1", "NOT_AN_INTEGER", "job-1", 122L, "some-path", "1", null);
+        assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
+
+        modelAndView = artifactsController.putArtifact("pipeline-1", "1", "stage-1", "-123", "job-1", 122L, "some-path", "1", null);
+        assertThat(((ResponseCodeView) modelAndView.getView()).getStatusCode(), is(SC_NOT_FOUND));
+    }
+
     @Test
     public void shouldFunnelAll_GET_calls() throws Exception {
         final ModelAndView returnVal = new ModelAndView();

programming_language: Java