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[SECURITY] Fix Zip Slip Vulnerability #1645

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[SECURITY] Fix Zip Slip Vulnerability #1645

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5 changes: 4 additions & 1 deletion src/org/loklak/LoklakServer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -374,7 +374,10 @@ private static void extractContents() {

private static void extract(JarFile jar, JarEntry file) throws IOException {
Path workingDirectory = Paths.get("").toAbsolutePath();
File target = new File(workingDirectory.toString() + File.separator + file.getName());
File target = new File(workingDirectory.toString(), file.getName());
if (!target.toPath().normalize().startsWith(workingDirectory.toString())) {
throw new IOException("Bad zip entry");
}

if (target.exists())
return;
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