[tomcat] branch 9.0.x updated: Fix symlink edge case

[ma...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

markt pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git


The following commit(s) were added to refs/heads/9.0.x by this push:
     new ba089ab465 Fix symlink edge case
ba089ab465 is described below

commit ba089ab465af71f41dbcc910fbcc9cdef83d5cb2
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Wed Jun 7 09:49:49 2023 +0100

    Fix symlink edge case
---
 .../apache/catalina/webresources/AbstractFileResourceSet.java    | 5 +++++
 webapps/docs/changelog.xml                                       | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/java/org/apache/catalina/webresources/AbstractFileResourceSet.java b/java/org/apache/catalina/webresources/AbstractFileResourceSet.java
index e910e65118..019bb908f4 100644
--- a/java/org/apache/catalina/webresources/AbstractFileResourceSet.java
+++ b/java/org/apache/catalina/webresources/AbstractFileResourceSet.java
@@ -117,6 +117,11 @@ public abstract class AbstractFileResourceSet extends AbstractResourceSet {
         absPath = absPath.substring(absoluteBase.length());
         canPath = canPath.substring(canonicalBase.length());
 
+        // The remaining request path must start with '/' if it has non-zero length
+        if (canPath.length() > 0 && canPath.charAt(0) != '/') {
+            return null;
+        }
+
         // Case sensitivity check
         // The normalized requested path should be an exact match the equivalent
         // canonical path. If it is not, possible reasons include:
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 4b8bbfdae5..f60001fc8c 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -105,6 +105,15 @@
   issues do not "pop up" wrt. others).
 -->
 <section name="Tomcat 9.0.77 (remm)" rtext="in development">
+  <subsection name="Catalina">
+    <changelog>
+      <fix>
+        Fix an edge case where intra-web application symlinks would be followed
+        if the web applications were deliberately crafted to allow it even when
+        <code>allowLinking</code> was set to <code>false</code>. (markt)
+      </fix>
+    </changelog>
+  </subsection>
 </section>
 <section name="Tomcat 9.0.76 (remm)" rtext="release in progress">
   <subsection name="Catalina">


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