From a387ac74cdbaf978a7a6754f5ae3fda8561e7719 Mon Sep 17 00:00:00 2001 From: Jonathan Leitschuh Date: Mon, 8 Aug 2022 21:42:40 +0000 Subject: [PATCH] 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 Signed-off-by: Jonathan Leitschuh Bug-tracker: https://github.com/JLLeitschuh/security-research/issues/13 Co-authored-by: Moderne --- jbake-core/src/main/java/org/jbake/app/FileUtil.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/jbake-core/src/main/java/org/jbake/app/FileUtil.java b/jbake-core/src/main/java/org/jbake/app/FileUtil.java index c80dbf9e..ef1c2d17 100644 --- a/jbake-core/src/main/java/org/jbake/app/FileUtil.java +++ b/jbake-core/src/main/java/org/jbake/app/FileUtil.java @@ -328,6 +328,6 @@ public static boolean isFileInDirectory(File file, File directory) throws IOExce return (file.exists() && !file.isHidden() && directory.isDirectory() - && file.getCanonicalPath().startsWith(directory.getCanonicalPath())); + && file.getCanonicalFile().toPath().startsWith(directory.getCanonicalFile().toPath())); } }