T05 · Unauthorized Access and Privilege Escalation
Note
- Location
- check.sh:7
- Finding
- Unnecessary Privileged Host Reconnaissance<![CDATA[ ## Vulnerability Details **File Location**: `check.sh`, lines 7–29 **Vulnerability Type**: Excessive privilege use during local security checks **Risk Level**: Low ### Complete Code Snippet ```bash if command -v firewallctl >/dev/null 2>&1; then firewallctl status || echo "无法获取防火墙状态" elif [[ "$OSTYPE" == "darwin"* ]]; then /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate || echo "防火墙状态未知" else sudo ufw status || echo "防火墙状态未知" fi echo "\n## 打开的端口" if [[ "$OSTYPE" == "darwin"* ]]; then sudo lsof -nP -iTCP -sTCP:LISTEN | awk 'NR>1 {print $9}' | sort | uniq else sudo ss -tuln fi echo "\n## 系统软件更新" if [[ "$OSTYPE" == "darwin"* ]]; then softwareupdate -l || echo "更新检查失败" else sudo apt list --upgradable 2>/dev/null || echo "更新检查失败" fi echo "\n## SSH 服务状态" if pgrep -x sshd >/dev/null; then echo "sshd 正在运行" else echo "sshd 未运行" fi ``` ### Technical Analysis The script performs read-only host reconnaissance, including firewall inspection, listening-port enumeration, package-update discovery, and SSH daemon detection. These operations are consistent with the documented health-check purpose, but several commands are invoked through `sudo` even though they commonly do not require elevated privileges, particularly: ```bash sudo ss -tuln sudo apt list --upgradable ``` Unnecessary use of `sudo` violates least-privilege principles and conditions users to approve elevation for routine inspection. The collected output also reveals the system's network exposure and patch state. The commands are fixed rather than attacker-controlled, so the code does not provide a direct command-injection path or arbitrary root-code execution. The concern is the unnecessarily broad privilege boundary and the collection of security-sensitive host metadata. ### Attack Path 1. A user invokes the local health-check skill. 2. The script reaches one or more commands prefixed with `sudo`. 3. The user m ...[truncated 1054 chars]
- Remediation
- <![CDATA[ ## Remediation Suggestions 1. Remove `sudo` from commands that can run with ordinary user privileges: ```bash ufw status lsof -nP -iTCP -sTCP:LISTEN ss -tuln apt list --upgradable ``` 2. If a specific platform genuinely requires elevation, explain why and obtain explicit user consent before invoking `sudo`. 3. Prefer capability detection and graceful degradation over automatic privilege escalation. 4. Collect only the listener and update information required for the report. 5. Protect the generated report with restrictive permissions because it contains host-security metadata: ```bash umask 077 ``` ]]>