Commits on Sep 21, 2022

1. vuln-fix: Partial Path Traversal Vulnerability …

   This fixes a partial path traversal vulnerability.
   
   Replaces `dir.getCanonicalPath().startsWith(parent.getCanonicalPath())`, which is vulnerable to partial path traversal attacks, with the more secure `dir.getCanonicalFile().toPath().startsWith(parent.getCanonicalFile().toPath())`.
   
   To demonstrate this vulnerability, consider `"/usr/outnot".startsWith("/usr/out")`.
   The check is bypassed although `/outnot` is not under the `/out` directory.
   It's important to understand that the terminating slash may be removed when using various `String` representations of the `File` object.
   For example, on Linux, `println(new File("/var"))` will print `/var`, but `println(new File("/var", "/")` will print `/var/`;
   however, `println(new File("/var", "/").getCanonicalPath())` will print `/var`.
   
   Weakness: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
   Severity: Medium
   CVSSS: 6.1
   Detection: CodeQL & OpenRewrite (https://public.moderne.io/recipes/org.openrewrite.java.security.PartialPathTraversalVulnerability)
   
   Reported-by: Jonathan Leitschuh <[email protected]>
   Signed-off-by: Jonathan Leitschuh <[email protected]>
   
   Bug-tracker: JLLeitschuh/security-research#13
   
   Co-authored-by: Moderne <[email protected]>

   

   JLLeitschuh and TeamModerne committed Sep 21, 2022
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