Apache Reverse Proxy Bypass Vulnerability Scanner - Metasploit
This page contains detailed information about how to use the auxiliary/scanner/http/rewrite_proxy_bypass metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Apache Reverse Proxy Bypass Vulnerability Scanner
Module: auxiliary/scanner/http/rewrite_proxy_bypass
Source code: modules/auxiliary/scanner/http/rewrite_proxy_bypass.rb
Disclosure date: -
Last modification time: 2017-07-24 06:26:21 +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-2011-3368
Scan for poorly configured reverse proxy servers. By default, this module attempts to force the server to make a request with an invalid domain name. Then, if the bypass is successful, the server will look it up and of course fail, then responding with a status code 502. A baseline status code is always established and if that baseline matches your test status code, the injection attempt does not occur. "set VERBOSE true" if you are paranoid and want to catch potential false negatives. Works best against Apache and mod_rewrite
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.
Basic Usage
This module is a scanner module, and is capable of testing against multiple hosts.
msf > use auxiliary/scanner/http/rewrite_proxy_bypass
msf auxiliary(rewrite_proxy_bypass) > show options
... show and set options ...
msf auxiliary(rewrite_proxy_bypass) > set RHOSTS ip-range
msf auxiliary(rewrite_proxy_bypass) > exploit
Other examples of setting the RHOSTS option:
Example 1:
msf auxiliary(rewrite_proxy_bypass) > set RHOSTS 192.168.1.3-192.168.1.200
Example 2:
msf auxiliary(rewrite_proxy_bypass) > set RHOSTS 192.168.1.1/24
Example 3:
msf auxiliary(rewrite_proxy_bypass) > set RHOSTS file:/tmp/ip_list.txt
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
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Msfconsole Usage
Here is how the scanner/http/rewrite_proxy_bypass auxiliary module looks in the msfconsole:
msf6 > use auxiliary/scanner/http/rewrite_proxy_bypass
msf6 auxiliary(scanner/http/rewrite_proxy_bypass) > show info
Name: Apache Reverse Proxy Bypass Vulnerability Scanner
Module: auxiliary/scanner/http/rewrite_proxy_bypass
License: Metasploit Framework License (BSD)
Rank: Normal
Provided by:
chao-mu
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
BASELINE_URI / yes Requested to establish that EXPECTED_RESPONSE is not the usual response
ESCAPE_SEQUENCE @ yes Character(s) that terminate the rewrite rule
EXPECTED_RESPONSE 502 yes Status code that indicates vulnerability
INJECTED_URI ... yes String injected after escape sequence
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 80 yes The target port (TCP)
SSL false no Negotiate SSL/TLS for outgoing connections
THREADS 1 yes The number of concurrent threads (max one per host)
VHOST no HTTP server virtual host
Description:
Scan for poorly configured reverse proxy servers. By default, this
module attempts to force the server to make a request with an
invalid domain name. Then, if the bypass is successful, the server
will look it up and of course fail, then responding with a status
code 502. A baseline status code is always established and if that
baseline matches your test status code, the injection attempt does
not occur. "set VERBOSE true" if you are paranoid and want to catch
potential false negatives. Works best against Apache and mod_rewrite
References:
http://www.contextis.com/research/blog/reverseproxybypass/
https://nvd.nist.gov/vuln/detail/CVE-2011-3368
Module Options
This is a complete list of options available in the scanner/http/rewrite_proxy_bypass auxiliary module:
msf6 auxiliary(scanner/http/rewrite_proxy_bypass) > show options
Module options (auxiliary/scanner/http/rewrite_proxy_bypass):
Name Current Setting Required Description
---- --------------- -------- -----------
BASELINE_URI / yes Requested to establish that EXPECTED_RESPONSE is not the usual response
ESCAPE_SEQUENCE @ yes Character(s) that terminate the rewrite rule
EXPECTED_RESPONSE 502 yes Status code that indicates vulnerability
INJECTED_URI ... yes String injected after escape sequence
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 80 yes The target port (TCP)
SSL false no Negotiate SSL/TLS for outgoing connections
THREADS 1 yes The number of concurrent threads (max one per host)
VHOST no HTTP server virtual host
Advanced Options
Here is a complete list of advanced options supported by the scanner/http/rewrite_proxy_bypass auxiliary module:
msf6 auxiliary(scanner/http/rewrite_proxy_bypass) > show advanced
Module advanced options (auxiliary/scanner/http/rewrite_proxy_bypass):
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
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: 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/4.0 (compatible; MSIE 6.0; Windows NT 5.1) no The User-Agent header to use for all requests
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/rewrite_proxy_bypass module can do:
msf6 auxiliary(scanner/http/rewrite_proxy_bypass) > show actions
Auxiliary actions:
Name Description
---- -----------
Evasion Options
Here is the full list of possible evasion options supported by the scanner/http/rewrite_proxy_bypass auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 auxiliary(scanner/http/rewrite_proxy_bypass) > show evasion
Module 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
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Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
<RHOST>:<RPORT> Request timed out
Here is a relevant code snippet related to the "<RHOST>:<RPORT> Request timed out" error message:
55: vprint_error e.to_s
56: return nil
57: end
58:
59: if response.nil?
60: vprint_error "#{rhost}:#{rport} Request timed out"
61: return nil
62: end
63:
64: seconds_transpired = (responded_at - requested_at).to_f
65: vprint_status "#{rhost}:#{rport} Server took #{seconds_transpired} seconds to respond to URI #{uri}"
<RHOST>:<RPORT> The baseline status code for <HOST> matches our test's
Here is a relevant code snippet related to the "<RHOST>:<RPORT> The baseline status code for <HOST> matches our test's" error message:
81: if baseline.nil?
82: return
83: end
84:
85: if baseline[:status_code] == test_status_code
86: vprint_error "#{rhost}:#{rport} The baseline status code for #{host} matches our test's"
87: return
88: end
89:
90: uri = datastore['ESCAPE_SEQUENCE'] + datastore['INJECTED_URI']
91: injection_info = make_request(host, uri, 60)
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Related Pull Requests
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #2525 Merged Pull Request: Change module boilerplate
- #1228 Merged Pull Request: MSFTIDY cleanup #1 - auxiliary
References
See Also
Check also the following modules related to this module:
- auxiliary/admin/http/allegro_rompager_auth_bypass
- auxiliary/admin/http/grafana_auth_bypass
- auxiliary/admin/http/iis_auth_bypass
- auxiliary/admin/http/netgear_pnpx_getsharefolderlist_auth_bypass
- auxiliary/admin/ldap/vmware_vcenter_vmdir_auth_bypass
- auxiliary/admin/networking/cisco_dcnm_auth_bypass
- auxiliary/admin/networking/cisco_secure_acs_bypass
- auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass
- auxiliary/admin/vnc/realvnc_41_bypass
- auxiliary/gather/samsung_browser_sop_bypass
- auxiliary/scanner/http/cisco_ios_auth_bypass
- auxiliary/scanner/http/dir_webdav_unicode_bypass
- auxiliary/scanner/http/intel_amt_digest_bypass
- auxiliary/scanner/http/ms09_020_webdav_unicode_bypass
- auxiliary/scanner/http/verb_auth_bypass
- auxiliary/scanner/misc/dahua_dvr_auth_bypass
- auxiliary/scanner/ssh/libssh_auth_bypass
- exploit/windows/http/apache_mod_rewrite_ldap
- exploit/linux/proxy/squid_ntlm_authenticate
- exploit/windows/proxy/bluecoat_winproxy_host
- exploit/windows/proxy/ccproxy_telnet_ping
- exploit/windows/proxy/proxypro_http_get
- exploit/windows/proxy/qbik_wingate_wwwproxy
- auxiliary/scanner/http/exchange_proxylogon
- auxiliary/scanner/http/open_proxy
- auxiliary/scanner/http/fortimail_login_bypass_detection
- auxiliary/scanner/wproxy/att_open_proxy
- auxiliary/scanner/mysql/mysql_authbypass_hashdump
- auxiliary/gather/exchange_proxylogon_collector
- auxiliary/server/jsse_skiptls_mitm_proxy
- auxiliary/server/openssl_altchainsforgery_mitm_proxy
- auxiliary/server/socks_proxy
- auxiliary/pdf/foxit/authbypass
Related Nessus plugins:
- Mac OS X Multiple Vulnerabilities (Security Update 2012-004) (BEAST)
- Mac OS X 10.7.x < 10.7.5 Multiple Vulnerabilities (BEAST)
Authors
- chao-mu
Version
This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.
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