CodeRunner 4's new editor supports fully context-independent multiple selections. It's also easy to add support for third-party linters. Compile and runtime issues in the console are automatically highlighted and included in the document. CodeRunner checks your document for errors and common issues, underlining mistakes and describing the problem directly inline with your code. Get instant feedback on your code as you write it. CodeRunner 4 is a huge update with hundreds of new features and improvements, including: If (!empty($widgetConfig) AND !vB::getDatastore()->getOption('disable_php_rendering')) vB5_Template_Runtime::includeTemplate('module_title',array('widgetConfig' => $widgetConfig, 'show_title_divider' => '1', 'can_use_sitebuilder' => $user)). '' $widgetConfig = vB5_Template_Runtime::parseData('widget', 'fetchConfig', $widgetinstanceid) If (empty($widgetConfig) AND !empty($widgetinstanceid)) $widgetConfig, the malicious code in the request will be executed. ![]() Since the generated code has a line of vB5_Template_Runtime::evalPhp(''. When an attacker manipulates an Ajax request that contains template name widget_php and malicious code placed in the parameter widgetConfig, the render engine will convert the XML template widget_php shown in Figure 2 to a string of PHP code, then execute the code by the eval function highlighted in Figure 3. ![]() Thus, the template name and the related config which come from those parameters are user-controllable, which leads to the RCE vulnerability CVE-2019-16759. As shown in Figure 1, the values of parameters for this function are from $_REQUESTS, $_GET and $_POST. The rendering is executed with a function staticRenderAjax. Beginning from version 5.0, vBulletin starts to accept Ajax requests for template rendering. Template rendering is a functionality of vBulletin that can convert XML templates to PHP code and execute it. Root Cause Analysis of the Vulnerability (CVE-2020-17496) ![]() Palo Alto Networks customers are protected by the following services and products via Threat Prevention signatures and URL Filtering blocks the related C2 traffic. In this blog, we provide details on the bypass of the patch of the vulnerability, proof of concept code (PoC) to demonstrate the vulnerability and information on attacks we have observed in the wild. More than 100,000 sites are built on vBulletin, including the forums of major enterprises and organizations, so it’s imperative to patch immediately. The exploits are a bypass of the fix for the previous vulnerability, CVE-2019-16759, which allows attackers to send a crafted HTTP request with a specified template name and malicious PHP code, and leads to remote code execution. Recently, Unit 42 researchers found exploits in the wild leveraging the vBulletin pre-auth RCE vulnerability CVE-2020-17496. By exploiting this vulnerability, an attacker could have gained privileged access and control over any vBulletin server running versions 5.0.0 up to 5.5.4, and potentially lock organizations out from their own sites. At that time, Unit 42 researchers published a blog on this vBulletin vulnerability, analyzing its root cause and the exploit we found in the wild. In September 2019, a remote code execution (RCE) vulnerability identified as CVE-2019-16759 was disclosed for vBulletin, a popular forum software.
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