Commits on Sep 23, 2022

1. vuln-fix: Zip Slip Vulnerability …

   This fixes a Zip-Slip vulnerability.
   
   This change does one of two things. This change either
   
   1. Inserts a guard to protect against Zip Slip.
   OR
   2. 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())`.
   
   For number 2, 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: High
   CVSSS: 7.4
   Detection: CodeQL (https://codeql.github.com/codeql-query-help/java/java-zipslip/) & OpenRewrite (https://public.moderne.io/recipes/org.openrewrite.java.security.ZipSlip)
   
   Reported-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
   Signed-off-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
   
   Bug-tracker: JLLeitschuh/security-research#16
   
   Co-authored-by: Moderne <team@moderne.io>

   

   JLLeitschuh and TeamModerne committed Sep 23, 2022
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