Vulnerability · Published Apr 18, 2024 · Assigned by GitHub_M
CVE-2024-28185Judge0 vulnerable to Sandbox Escape via Symbolic Link
Critical 10.0
In plain English
A critical-severity security flaw in judge0 from judge0. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 7.1% (higher than 94% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit.
Official description
Judge0 is an open-source online code execution system. The application does not account for symlinks placed inside the sandbox directory, which can be leveraged by an attacker to write to arbitrary files and gain code execution outside of the sandbox. When executing a submission, Judge0 writes a `run_script` to the sandbox directory. The security issue is that an attacker can create a symbolic link (symlink) at the path `run_script` before this code is executed, resulting in the `f.write` writing to an arbitrary file on the unsandboxed system. An attacker can leverage this vulnerability to overwrite scripts on the system and gain code execution outside of the sandbox.
Affected products (as reported)
Weakness: CWE-61, CWE-59 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H