It lets you easily apply the principle of least privilege to make sure that your app is restricted to do only what it needs to do, and nothing more. Intrinsic is a module for Node.js applications which protects applications against vulnerabilities that no one has discovered yet (If you’d like to use Intrinsic to protect your app, contact us at Instead of reacting to new vulnerability reports, Intrinsic is preventive. /etc/passwd, it will write to a file at /tmp/target/././etc/passwd, which resolves to /etc/passwd. So if the user-upload.zip file contains an entry for. With the vulnerable library installed, an attacker can upload a specially crafted *.zip file and this will result in creating files outside of the intended /tmp/target destination.
#Unzipper extract zip file
This library was recently updated in v0.8.3 to fix exactly this vulnerability.) In this example we have a zip file located at /tmp/user-upload.zip, and are attempting to extract the contents to /tmp/target. (Note that this depends on an unpatched version of the unzipper library. createReadStream('/tmp/user-upload.zip'). Here’s an example of an application vulnerable to Zip Slip: const fs = require('fs') const unzipper = require('unzipper') // unzipper <= 0.8.2 fs. Some more examples of what an attacker could do includes uploading a file which overwrites the actual server.js application, replace an important system binary with a malicious one, add a configuration file which allows for remote access to a service, etc. This can then leave the OS in a dangerous state (e.g., unable to boot or with login credentials known by a third party). /etc/passwd, etc., and assuming the process has write privileges to /etc/passwd, then the process which extracts the file would overwrite this important OS file. Then, when unpatched libraries attempt to extract these files, the extracted files can be written to unintended locations.Īs an example, if an attacker uploads multiple *.zip files to a service, each containing different permutations of.
#Unzipper extract archive
In order to exploit this attack, one creates a compressed archive containing files which include. Zip Slip is a recently coined phrase for a variant of the classical Path Traversal attack. Protecting Node.js Applications from Zip Slip
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