Apache Struts 2.x < 2.5.26 RCE (S2-061) - Nessus

Critical Plugin ID: 143599

This page contains detailed information about the Apache Struts 2.x < 2.5.26 RCE (S2-061) 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: 143599
Name: Apache Struts 2.x < 2.5.26 RCE (S2-061)
Filename: struts_2_5_26.nasl
Vulnerability Published: 2020-12-08
This Plugin Published: 2020-12-09
Last Modification Time: 2022-04-11
Plugin Version: 1.8
Plugin Type: local
Plugin Family: Misc.
Dependencies: os_fingerprint.nasl, struts_detect_nix.nbin, struts_detect_win.nbin

Vulnerability Information

Severity: Critical
Vulnerability Published: 2020-12-08
Patch Published: 2020-11-21
CVE [?]: CVE-2020-17530
CPE [?]: cpe:/a:apache:struts

Synopsis

Apache Struts installed on the remote host is affected by a remote code execution vulnerability.

Description

The version of Apache Struts installed on the remote host is 2.x prior to 2.5.26. It is, therefore, affected by a a remote code execution vulnerability in its OGNL evaluation functionality due to insufficient validation of user input. An unauthenticated, remote attacker can exploit this to execute arbitrary commands on an affected host.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Apache Struts version 2.5.26 or later. Alternatively, apply the workarounds as referenced in the vendor security bulletins.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): installed_sw/Apache Struts, installed_sw/Struts
Exploit Available: True (Metasploit Framework, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Apache Struts 2.x < 2.5.26 RCE (S2-061) vulnerability:

Metasploit: exploit/multi/http/struts2_multi_eval_ognl
[Apache Struts 2 Forced Multi OGNL Evaluation]
GitHub: https://github.com/0day666/Vulnerability-verification
[CVE-2020-17530]
GitHub: https://github.com/CyborgSecurity/CVE-2020-17530
[CVE-2020-17530]
GitHub: https://github.com/EdgeSecurityTeam/Vulnerability
[CVE-2020-17530]
GitHub: https://github.com/EvilPulsar/S2-061
[CVE-2020-17530]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2020-17530]
GitHub: https://github.com/SexyBeast233/SecBooks
[CVE-2020-17530]
GitHub: https://github.com/alexfrancow/CVE-Search
[CVE-2020-17530]
GitHub: https://github.com/ciakim/CVE-2020-17530
[CVE-2020-17530]
GitHub: https://github.com/jeansgit/Pentest
[CVE-2020-17530]
GitHub: https://github.com/ka1n4t/CVE-2020-17530
[CVE-2020-17530]
GitHub: https://github.com/killmonday/CVE-2020-17530-s2-061
[CVE-2020-17530]
GitHub: https://github.com/lovechinacoco/https-github.com-mai-lang-chai-Middleware-Vulnerability-detection
[CVE-2020-17530]
GitHub: https://github.com/ludy-dev/freemarker_RCE_struts2_s2-061
[CVE-2020-17530: (cve-2020-17530) struts2_s2-061 freemarker_RCE testscript]
GitHub: https://github.com/uzzzval/CVE-2020-17530
[CVE-2020-17530]
GitHub: https://github.com/woods-sega/woodswiki
[CVE-2020-17530]
GitHub: https://github.com/154802388/CVE-2020-17531
[CVE-2020-17530: Apache Struts2框架是一个用于开发Java ...]
GitHub: https://github.com/Al1ex/CVE-2020-17530
[CVE-2020-17530: S2-061 CVE-2020-17530]
GitHub: https://github.com/fengziHK/CVE-2020-17530-strust2-061
[CVE-2020-17530: CVE-2020-17530-strust2-061]
GitHub: https://github.com/pangyu360es/CVE-2020-17530
[CVE-2020-17530: Apache Struts2框架是一个用于开发Java ...]
GitHub: https://github.com/phil-fly/CVE-2020-17530
[CVE-2020-17530: hack，poc]
GitHub: https://github.com/wuzuowei/CVE-2020-17530
[CVE-2020-17530: S2-061 的payload，以及对应简单的PoC/Exp]

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-2020-17530
CVSS V2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:H/RL:OF/RC:C

CVSS Base Score:	7.5 (High)
Impact Subscore:	6.4
Exploitability Subscore:	10.0
CVSS Temporal Score:	6.5 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.5 (Medium)

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)

STIG Severity [?]: I
STIG Risk Rating: High

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Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(143599);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2020-17530");
  script_xref(name:"IAVA", value:"2020-A-0565");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");

  script_name(english:"Apache Struts 2.x < 2.5.26 RCE (S2-061)");

  script_set_attribute(attribute:"synopsis", value:
"Apache Struts installed on the remote host is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Apache Struts installed on the remote host is 2.x prior to 2.5.26. It is, therefore, affected by a 
a remote code execution vulnerability in its OGNL evaluation functionality due to insufficient validation of user 
input. An unauthenticated, remote attacker can exploit this to execute arbitrary commands on an affected host.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://cwiki.apache.org/confluence/display/WW/S2-061");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Apache Struts version 2.5.26 or later. Alternatively, apply the workarounds as referenced in the vendor 
  security bulletins.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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-2020-17530");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Apache Struts 2 Forced Multi OGNL Evaluation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/12/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/12/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:struts");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("os_fingerprint.nasl", "struts_detect_win.nbin", "struts_detect_nix.nbin");
  script_require_ports("installed_sw/Apache Struts", "installed_sw/Struts");

  exit(0);
}

include('vcf.inc');

os = get_kb_item_or_exit('Host/OS');
win_local = 'windows' >< tolower(os);

app_info = vcf::get_app_info(app:'Apache Struts', win_local:win_local);
vcf::check_granularity(app_info:app_info, sig_segments:3);

constraints = [{'min_version':'2.0.0', 'fixed_version':'2.5.26'}];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE
);

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/struts_2_5_26.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\struts_2_5_26.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/struts_2_5_26.nasl

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How to Run

Here is how to run the Apache Struts 2.x < 2.5.26 RCE (S2-061) 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 Misc. plugin family.
On the right side table select Apache Struts 2.x < 2.5.26 RCE (S2-061) plugin ID 143599.
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 struts_2_5_26.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a struts_2_5_26.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - struts_2_5_26.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 struts_2_5_26.nasl -t <IP/HOST>

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References

IAVA | Information Assurance Vulnerability Alert:

2020-A-0565

See also:

Similar and related Nessus plugins:

148986 - Oracle MySQL Enterprise Monitor Multiple Vulnerabilities (Apr 2021 CPU)
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105005 - Apache Struts 2.5.x < 2.5.14.1 Json-lib JSON Parsing Unspecified DoS (S2-054) (S2-055)
108760 - Apache Struts XStream Handler REST Plugin XML Request Handling Remote DoS (S2-056)
112036 - Apache Struts CVE-2018-11776 Results With No Namespace Possible Remote Code Execution (S2-057)
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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file struts_2_5_26.nasl version 1.8. For more plugins, visit the Nessus Plugin Library.

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Apache Struts 2.x < 2.5.26 RCE (S2-061) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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