Directory Traversal Affecting org.apache.shiro:shiro-web package, versions [,1.12.0)
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Test your applications- Snyk ID SNYK-JAVA-ORGAPACHESHIRO-5804850
- published 25 Jul 2023
- disclosed 24 Jul 2023
- credit tkswifty, Ha1c9on
Introduced: 24 Jul 2023
CVE-2023-34478 Open this link in a new tabHow to fix?
Upgrade org.apache.shiro:shiro-web
to version 1.12.0 or higher.
Overview
org.apache.shiro:shiro-web is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management.
Affected versions of this package are vulnerable to Directory Traversal when used together with APIs or other web frameworks that route non-normalized requests. An attacker can use this to access unintended locations on the target filesystem by sending malicious requests.
Details
A Directory Traversal attack (also known as path traversal) aims to access files and directories that are stored outside the intended folder. By manipulating files with "dot-dot-slash (../)" sequences and its variations, or by using absolute file paths, it may be possible to access arbitrary files and directories stored on file system, including application source code, configuration, and other critical system files.
Directory Traversal vulnerabilities can be generally divided into two types:
- Information Disclosure: Allows the attacker to gain information about the folder structure or read the contents of sensitive files on the system.
st
is a module for serving static files on web pages, and contains a vulnerability of this type. In our example, we will serve files from the public
route.
If an attacker requests the following URL from our server, it will in turn leak the sensitive private key of the root user.
curl http://localhost:8080/public/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/root/.ssh/id_rsa
Note %2e
is the URL encoded version of .
(dot).
- Writing arbitrary files: Allows the attacker to create or replace existing files. This type of vulnerability is also known as
Zip-Slip
.
One way to achieve this is by using a malicious zip
archive that holds path traversal filenames. When each filename in the zip archive gets concatenated to the target extraction folder, without validation, the final path ends up outside of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.
The following is an example of a zip
archive with one benign file and one malicious file. Extracting the malicious file will result in traversing out of the target folder, ending up in /root/.ssh/
overwriting the authorized_keys
file:
2018-04-15 22:04:29 ..... 19 19 good.txt
2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys