Arbitrary File Write via Archive Extraction (Zip Slip) Affecting com.alibaba.oneagent:one-java-agent-plugin package, versions [0,]

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) using a specially crafted archive that holds directory traversal filenames (e.g. ../../evil.exe). The attacker can overwrite executable files and either invoke them remotely or wait for the system or user to call them, thus achieving remote command execution on the victim’s machine.

// ZIpslip.class

import java.io.IOException;

import com.alibaba.oneagent.utils.*;

public class ZIpslip {

public static void main(String[] args) {

try {
IOUtils.unzip("C:evil.zip", "D:zipzipzip"); //evil.zip contains ../../evil.exe
} catch (IOException e) {
e.printStackTrace();
}

}
}

It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out 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 malicous 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

• GitHub Commit
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• Vulnerable Code