Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS05OGhxLTR3bXctOTh3Oc4AAxiI

Arbitrary code execution in de.tum.in.ase:artemis-java-test-sandbox

Summary

Because of the missing checkLink(String) override in the SecurityManager, students can load libraries and execute arbitrary code.

Details

Using System.load(String) or System.loadLibrary​(String) students can load and execute arbitrary code.

private static native void start(List<String> args);

public static void main(String[] args) {
  System.load(new File("path_to_lib.so").getAbsolutePath());
  start(List.of(args));
}

Adding this to the security manager (and a translation) should fix the issue:

@Override
public void checkExec(String cmd) {
  try {
    if (enterPublicInterface())
      return;
    throw new SecurityException(localized("security.error_link")); //$NON-NLS-1$
  } finally {
    exitPublicInterface();
  }
}

PoC

See details.

Impact

Arbitrary code execution.

Permalink: https://github.com/advisories/GHSA-98hq-4wmw-98w9
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS05OGhxLTR3bXctOTh3Oc4AAxiI
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 4 months ago
Updated: 3 months ago

CVSS Score: 8.2
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Identifiers: GHSA-98hq-4wmw-98w9
References:

• https://github.com/ls1intum/Ares/security/advisories/GHSA-98hq-4wmw-98w9
• https://github.com/advisories/GHSA-98hq-4wmw-98w9

Affected Packages