CVE-2024-48990 PoC — needrestart 安全漏洞

Description

PoC for CVE-2024-48990

介绍

# PoC for CVE-2024-48990

CVE-2024-48990 is a local privilege escalation vulnerability found in the `needrestart` utility. The vuln exists in versions prior to 3.8. The service, which runs as root during events like package installations, insecurely scans all running processes. When it finds a Python process, it reads and trusts the PYTHONPATH environment variable from that process.

An unprivileged local attacker can hijack the PYTHONPATH on a "lure" process. When `needrestart` runs, it will find it, adopting the malicious path, and then execute the attacker's code with root privileges.

## Usage
1. Clone the repository in an attacker controlled directory:
```
git clone https://github.com/Mr-DJ/CVE-2024-48990
cd CVE-2024-48990
```

2. Make the exploit script executable:
```
chmod +x exploit.sh
```

3. Run the exploit. It will set the trap and wait till the SUID shell is detected(created when `needrestart` is executed by root), popping a root shell.


## Mitigation
- Patch: Update `needrestart` to version 3.8 or a patched version from your distribution
- Harden Mounts: This exploit can also be mitigated by mounting user writable directories with the `nosuid` and `noexec` options.

## References
- CVE: [https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-48990](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-48990)
- Original Advisory: [Qualys - LPEs in needrestart](https://www.qualys.com/2024/11/19/needrestart/needrestart.txt)

- NIST: [NVD-CVE-2024-48990](https://nvd.nist.gov/vuln/detail/CVE-2024-48990)

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