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


0.0
medium
0
10

Snyk CVSS

    Attack Complexity High
    User Interaction Required
    Scope Changed
    Confidentiality High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 2.42% (90th percentile)
Expand this section
NVD
9.8 critical

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  • Snyk ID SNYK-JAVA-COMALIBABAONEAGENT-2407874
  • published 21 Apr 2022
  • disclosed 21 Feb 2022
  • credit Akhil Jain

How to fix?

A fix was pushed into the master branch but not yet published.

Overview

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.

PoC:

// 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();
}

}
}

Details

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