Exim 4.87 < 4.92 Remote Command Execution - Nessus

Critical Plugin ID: 125737

This page contains detailed information about the Exim 4.87 < 4.92 Remote Command Execution Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 125737
Name: Exim 4.87 < 4.92 Remote Command Execution
Filename: exim_4_92.nasl
Vulnerability Published: 2019-06-05
This Plugin Published: 2019-06-06
Last Modification Time: 2022-02-25
Plugin Version: 1.11
Plugin Type: remote
Plugin Family: SMTP problems
Dependencies: smtpserver_detect.nasl
Required KB Items [?]: Settings/ParanoidReport

Vulnerability Information

Severity: Critical
Vulnerability Published: 2019-06-05
Patch Published: 2019-02-10
CVE [?]: CVE-2019-10149
CPE [?]: cpe:/a:exim:exim
Exploited by Malware: True

Synopsis

The remote mail server is potentially affected by a remote command execution vulnerability.

Description

According to its banner, the version of Exim running on the remote host is between 4.87 and 4.91 (inclusive). It is, therefore, potentially affected by a remote command execution vulnerability. A flaw exists in the deliver_message() function that could allow an attacker to execute arbitrary commands via a specially crafted email.

Solution

Upgrade to Exim 4.92 or later.

Public Exploits

Target Network Port(s): 25
Target Asset(s): Services/smtp
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub, Immunity Canvas)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Exim 4.87 < 4.92 Remote Command Execution vulnerability:

Metasploit: exploit/linux/local/exim4_deliver_message_priv_esc
[Exim 4.87 - 4.91 Local Privilege Escalation]
Exploit-DB: exploits/linux/local/46996.sh
[EDB-46996: Exim 4.87 - 4.91 - Local Privilege Escalation]
Exploit-DB: exploits/linux/local/47307.rb
[EDB-47307: Exim 4.87 / 4.91 - Local Privilege Escalation (Metasploit)]
Exploit-DB: exploits/linux/remote/46974.txt
[EDB-46974: Exim 4.87 < 4.91 - (Local / Remote) Command Execution]
GitHub: https://github.com/0xdea/exploits
[CVE-2019-10149]
GitHub: https://github.com/ChrissHack/exim.exp
[CVE-2019-10149]
GitHub: https://github.com/Stick-U235/CVE-2019-10149-Exploit
[CVE-2019-10149: Exploit for CVE-2019-10149]
GitHub: https://github.com/cloudflare/exim-cve-2019-10149-data
[CVE-2019-10149: Data Collection Related to Exim CVE-2019-10149]
GitHub: https://github.com/dhn/exploits
[CVE-2019-10149]
GitHub: https://github.com/hackerhouse-opensource/exploits
[CVE-2019-10149]
GitHub: https://github.com/x418x/libaz
[CVE-2019-10149]
GitHub: https://github.com/aishee/CVE-2019-10149-quick
[CVE-2019-10149: Simple Bash shell quick fix CVE-2019-10149]
GitHub: https://github.com/area1/exim-cve-2019-10149-data
[CVE-2019-10149: Data Collection Related to Exim CVE-2019-10149]
GitHub: https://github.com/AzizMea/CVE-2019-10149-privilege-escalation
[CVE-2019-10149: CVE-2019-10149 privilege escalation]
GitHub: https://github.com/Brets0150/StickyExim
[CVE-2019-10149: Exim Honey Pot for CVE-2019-10149 exploit attempts.]
GitHub: https://github.com/Chris-dev1/exim.exp
[CVE-2019-10149]
GitHub: https://github.com/darsigovrustam/CVE-2019-10149
[CVE-2019-10149: Instructions for installing a vulnerable version of Exim and its expluatation]
GitHub: https://github.com/Diefunction/CVE-2019-10149
[CVE-2019-10149: CVE-2019-10149 : A flaw was found in Exim versions 4.87 to 4.91 (inclusive). ...]
GitHub: https://github.com/Dilshan-Eranda/CVE-2019-10149
[CVE-2019-10149: SNP Assignment on a Linux vulnerability]
GitHub: https://github.com/MNEMO-CERT/PoC--CVE-2019-10149_Exim
[CVE-2019-10149: PoC for CVE-2019-10149, this vulnerability could be xploited betwen 4-87 to 4.91 ...]
GitHub: https://github.com/bananaphones/exim-rce-quickfix
[CVE-2019-10149: quick fix for CVE-2019-10149, works on DebianUbuntuCentos]
GitHub: https://github.com/cowbe0x004/eximrce-CVE-2019-10149
[CVE-2019-10149: Simple python socket connection to test if exim is vulnerable to CVE-2019-10149. The ...]
Immunity Canvas: CANVAS

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2019-10149
CVSS V2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	8.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.7 (High)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CVSS Base Score:	9.8 (Critical)
Impact Subscore:	5.9
Exploitability Subscore:	3.9
CVSS Temporal Score:	9.4 (Critical)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	9.4 (Critical)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(125737);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/25");

  script_cve_id("CVE-2019-10149");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/07/10");
  script_xref(name:"CISA-NCAS", value:"AA22-011A");

  script_name(english:"Exim 4.87 < 4.92 Remote Command Execution");

  script_set_attribute(attribute:"synopsis", value:
"The remote mail server is potentially affected by a remote command 
execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of Exim running on the remote
host is between 4.87 and 4.91 (inclusive). It is, therefore, potentially 
affected by a remote command execution vulnerability. A flaw exists
in the deliver_message() function that could allow an attacker to execute
arbitrary commands via a specially crafted email.");
  # https://www.tenable.com/blog/cve-2019-10149-critical-remote-command-execution-vulnerability-discovered-in-exim
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?16a2ac7f");
  # https://www.openwall.com/lists/oss-security/2019/06/05/4
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9de8f07f");
  # https://www.openwall.com/lists/oss-security/2019/06/06/1
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cf324cac");
  script_set_attribute(attribute:"see_also", value:"https://exim.org/static/doc/security/CVE-2019-10149.txt");
  script_set_attribute(attribute:"see_also", value:"ftp://ftp.exim.org/pub/exim/exim4/ChangeLog");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Exim 4.92 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-10149");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Exim 4.87 - 4.91 Local Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:"CANVAS");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/06/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/02/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/06/06");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:exim:exim");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"SMTP problems");

  script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smtpserver_detect.nasl");
  script_require_keys("Settings/ParanoidReport");
  script_require_ports("Services/smtp", 25);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("smtp_func.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

port = get_service(svc:"smtp", default:25, exit_on_fail:TRUE);

banner = get_smtp_banner(port:port);
if (!banner) audit(AUDIT_NO_BANNER, port);
if ("Exim" >!< banner) audit(AUDIT_NOT_LISTEN, 'Exim', port);

matches = pregmatch(pattern:"220.*Exim ([0-9\._]+)", string:banner);
if (isnull(matches)) audit(AUDIT_SERVICE_VER_FAIL, 'Exim', port);

version = matches[1];
# Underscore was added to the vesion
version = ereg_replace(string:version, pattern:'_', replace:'.');

if (ver_compare(minver:'4.87', ver:version, fix:'4.92', strict:FALSE) < 0)
{
  report =
    '\n  Banner            : ' + banner +
    '\n  Installed version : ' + version +
    '\n  Fixed version     : 4.92';

  security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);
}
else audit(AUDIT_LISTEN_NOT_VULN, 'Exim', port, version);

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/exim_4_92.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\exim_4_92.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/exim_4_92.nasl

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How to Run

Here is how to run the Exim 4.87 < 4.92 Remote Command Execution as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select SMTP problems plugin family.
On the right side table select Exim 4.87 < 4.92 Remote Command Execution plugin ID 125737.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl exim_4_92.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a exim_4_92.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - exim_4_92.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state exim_4_92.nasl -t <IP/HOST>

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References

See also:

Similar and related Nessus plugins:

125739 - Amazon Linux AMI : exim (ALAS-2019-1221)
125742 - Debian DSA-4456-1 : exim4 - security update
127100 - Exim deliver_message() Function Remote Command Execution Vulnerability (Remote)
125749 - FreeBSD : Exim -- RCE in deliver_message() function (45bea6b5-8855-11e9-8d41-97657151f8c2)
125751 - GLSA-201906-01 : Exim: Remote command execution
125843 - openSUSE Security Update : exim (openSUSE-2019-1524)
149614 - openSUSE Security Update : exim (openSUSE-2021-677) (Stack Clash)
125770 - Ubuntu 18.04 LTS / 18.10 : exim4 vulnerability (USN-4010-1)
107149 - Exim < 4.90.1 Buffer Overflow RCE Vulnerability
128553 - Exim < 4.92.2
129470 - Exim 4.92.x < 4.92.3 Heap Buffer Overflow
149260 - Exim < 4.94.2 Multiple Vulnerabilities (21Nails)
104815 - Exim < 4.89.1 Use-After-Free BDAT Remote Code Execution
51179 - Exim string_format Function Remote Overflow
66373 - Exim with Dovecot use_shell Command Injection
29830 - ClamAV clamav-milter black-hole-mode Sendmail Recipient Field Arbitrary Command Execution
10247 - Sendmail DEBUG/WIZ Remote Command Execution
78701 - Mail Transfer Agent and Mail Delivery Agent Remote Command Execution via Shellshock
77969 - Postfix Script Remote Command Execution via Shellshock
77970 - Qmail Remote Command Execution via Shellshock

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file exim_4_92.nasl version 1.11. For more plugins, visit the Nessus Plugin Library.

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Exim 4.87 < 4.92 Remote Command Execution - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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