# N/A
## 漏洞概述
存在一个权限提升漏洞，在版本 v0.9.0 之前的 Below 服务中，由于在 `/var/log/below` 创建了一个对所有人都可写的目录，本地非特权用户可能通过符号链接攻击操作文件（如 `/etc/shadow`）来提升到 root 权限。
## 影响版本
- 所有低于 v0.9.0 的版本
## 漏洞细节
在低于 v0.9.0 的 Below 服务中，程序创建了一个对所有人都可写的目录 `/var/log/below`。本地非特权用户可以利用这个漏洞通过符号链接攻击来修改或读取敏感文件（如 `/etc/shadow`），从而实现权限升级至 root。
## 漏洞影响
- 本地非特权用户可以通过符号链接攻击提升到 root 权限。
- 可以操作和篡改系统关键文件，导致系统安全风险。
是否为 Web 类漏洞： 未知
判断理由：
| # | POC 描述 | 源链接 | 神龙链接 |
|---|---|---|---|
| 1 | CVE-2025-27591 | https://github.com/obamalaolu/CVE-2025-27591 | POC详情 |
| 2 | Below v0.8.1 - Local Privilege Escalation (CVE-2025-27591) - PoC Exploit | https://github.com/rvizx/CVE-2025-27591 | POC详情 |
| 3 | CVE-2025-27591 is a privilege escalation vulnerability that affected the Below service before version 0.9.0 | https://github.com/BridgerAlderson/CVE-2025-27591-PoC | POC详情 |
| 4 | CVE-2025-27591 | https://github.com/DarksBlackSk/CVE-2025-27591 | POC详情 |
| 5 | CVE-2025-27591 is a known privilege escalation vulnerability in the Below service (version < v0.9.0) | https://github.com/dollarboysushil/Linux-Privilege-Escalation-CVE-2025-27591 | POC详情 |
| 6 | None | https://github.com/alialucas7/CVE-2025-27591_PoC | POC详情 |
| 7 | A Proof of Concept for CVE-2025-27591, a local privilege escalation in Below ≤ v0.8.1 | https://github.com/incommatose/CVE-2025-27591-PoC | POC详情 |
| 8 | 🔥 Local Privilege Escalation Exploit for CVE-2025-27591 | Abuses world-writable log dir in Below to gain root via /etc/passwd injection | https://github.com/00xCanelo/CVE-2025-27591 | POC详情 |
| 9 | None | https://github.com/Thekin-ctrl/CVE-2025-27591-Below | POC详情 |
| 10 | a C exploit for CVE-2025-27591, which allow an attacker to escalate privilege to root. | https://github.com/Cythonic1/CVE-2025-27591 | POC详情 |
| 11 | Below <v0.9.0 PoC Privilege Escalation Exploit | https://github.com/umutcamliyurt/CVE-2025-27591 | POC详情 |
| 12 | PoC for CVE-2025-27591 – Local privilege escalation in the below monitoring tool. By symlinking its log file to /etc/passwd, an attacker can inject a root account and gain full system compromise. | https://github.com/danil-koltsov/below-log-race-poc | POC详情 |
| 13 | Local Privilege Escalation vai `below` (CVE-2025-27591) - PoC Exploit | https://github.com/HOEUN-Visai/CVE-2025-27591-below- | POC详情 |
| 14 | CVE-2025-27591 | https://github.com/krn966/CVE-2025-27591 | POC详情 |
| 15 | A Bash-based privilege escalation exploit targeting the `below` system performance monitoring tool. This refurbished exploit leverages a symlink vulnerability in the logging mechanism to inject a root user into `/etc/passwd`, achieving full root access. | https://github.com/0xDTC/Below-Logger-Symlink-Attack_CVE-2025-27591 | POC详情 |
| 16 | self cleaning CVE-2025-27591 Poc that grants a root reverse shell instead of modifying passwd files | https://github.com/0x00Jeff/CVE-2025-27591 | POC详情 |
| 17 | Local Privilege Escalation vai `below` (CVE-2025-27591) - PoC Exploit | https://github.com/VisaiCyber/CVE-2025-27591-below- | POC详情 |
| 18 | Exploit for CVE-2025-27591 (for educational purposes) | https://github.com/Stp1t/CVE-2025-27591 | POC详情 |
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