Horizon Alert
Summary of the vulnerability and why it matters
A code injection vulnerability exists in the Smarty template engine, a tool used to generate dynamic web content. This issue could allow attackers to execute arbitrary PHP code, potentially impacting applications that use this technology by enabling them to take control of systems. The main concern is confirming relevance and exposure to this risk.
- Flaw allows arbitrary code execution.
- Understand its impact on your web applications.
- Assess exposure and consider relevant mitigation.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by leveraging template inheritance in a way that bypasses security checks. This allows them to insert malicious code into a template's cache file, which can then be executed when the template is included or processed by the application. This process could lead to arbitrary PHP code execution on the server.
- Vulnerable to remote attackers.
- Triggered via template inheritance.
- Leads to arbitrary code execution.
Live Threat
Current exploitation, exposure, and threat context
When supported by the advisory, a code injection vulnerability in Smarty's template inheritance could allow an attacker to execute arbitrary PHP code. This could occur when processing assigned data containing a forged SmartyNocache marker, leading to the regeneration of a PHP cache file with malicious code.
- PHP code execution on include.
- Attacker-supplied forged marker.
- Arbitrary code execution.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Smarty affects systems that use its template inheritance features. Application owners and infrastructure teams should coordinate to identify instances of the affected technology, assess their exposure, and plan remediation.
- Application owners should own the issue.
- Verify external reachability and business criticality first.
- Plan maintenance for remediation based on risk.
