From d6ad59dd2bd8f0a53dfadfd1462e9f470e4beef1 Mon Sep 17 00:00:00 2001 From: Jonathan Leitschuh Date: Wed, 21 Sep 2022 15:24:50 +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 --- .../scm/provider/git/gitexe/command/GitCommandLineUtils.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/maven-scm-providers/maven-scm-providers-git/maven-scm-provider-gitexe/src/main/java/org/apache/maven/scm/provider/git/gitexe/command/GitCommandLineUtils.java b/maven-scm-providers/maven-scm-providers-git/maven-scm-provider-gitexe/src/main/java/org/apache/maven/scm/provider/git/gitexe/command/GitCommandLineUtils.java index 0f0484cc6..3f424cb90 100644 --- a/maven-scm-providers/maven-scm-providers-git/maven-scm-provider-gitexe/src/main/java/org/apache/maven/scm/provider/git/gitexe/command/GitCommandLineUtils.java +++ b/maven-scm-providers/maven-scm-providers-git/maven-scm-provider-gitexe/src/main/java/org/apache/maven/scm/provider/git/gitexe/command/GitCommandLineUtils.java @@ -72,7 +72,7 @@ public static void addTarget( Commandline cl, List files ) String relativeFile = file.getPath(); final String canonicalFile = file.getCanonicalPath(); - if ( canonicalFile.startsWith( canonicalWorkingDirectory ) ) + if ( file.getCanonicalFile().toPath().startsWith(canonicalWorkingDirectory) ) { // so we can omit the starting characters relativeFile = canonicalFile.substring( canonicalWorkingDirectory.length() );