Vulnerabilities > CVE-2014-8998 - Code Injection vulnerability in X7Chat X7 Chat

047910
CVSS 6.5 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
SINGLE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
low complexity
x7chat
CWE-94
exploit available
metasploit

Summary

lib/message.php in X7 Chat 2.0.0 through 2.0.5.1 allows remote authenticated users to execute arbitrary PHP code via a crafted HTTP header to index.php, which is processed by the preg_replace function with the eval switch.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Manipulating User-Controlled Variables
    This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An attacker can override environment variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the attacker can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.

Exploit-Db

descriptionX7 Chat 2.0.5 lib/message.php preg_replace() PHP Code Execution. Remote exploit for php platform
fileexploits/php/remote/35183.rb
idEDB-ID:35183
last seen2016-02-04
modified2014-11-06
platformphp
port80
published2014-11-06
reportermetasploit
sourcehttps://www.exploit-db.com/download/35183/
titleX7 Chat 2.0.5 lib/message.php preg_replace PHP Code Execution
typeremote

Metasploit

descriptionThis module exploits a post-auth vulnerability found in X7 Chat versions 2.0.0 up to 2.0.5.1. The vulnerable code exists on lib/message.php, which uses preg_replace() function with the /e modifier. This allows a remote authenticated attacker to execute arbitrary PHP code in the remote machine.
idMSF:EXPLOIT/MULTI/HTTP/X7CHAT2_PHP_EXEC
last seen2020-06-05
modified2018-07-12
published2014-10-27
references
reporterRapid7
sourcehttps://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/multi/http/x7chat2_php_exec.rb
titleX7 Chat 2.0.5 lib/message.php preg_replace() PHP Code Execution