Horizon Alert
Summary of the vulnerability and why it matters
The ActionForm component within Apache Struts, when utilizing specific versions of BeanUtils, is susceptible to a flaw that can be exploited through specially crafted web requests. This vulnerability allows remote attackers to disrupt the normal operation of affected applications. The primary business risk associated with this flaw is the potential for denial-of-service conditions, impacting application availability.
- Vulnerable Apache Struts component
- Flaw allows denial-of-service
- Disruption of application availability
Attack Path
How an attacker could exploit the issue
The vulnerability exists in ActionForm within Apache Struts, impacting organizations using versions prior to 1.2.9 with BeanUtils 1.7. Attackers can exploit this by sending a specially crafted multipart/form-data encoded form. This input can lead to a denial-of-service condition, disrupting the availability of affected services.
- Exposure: Publicly accessible web applications using Apache Struts.
- Attacker Access: An unauthenticated attacker.
- Trigger and Result: Sending a crafted form causes denial of service.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow remote attackers to disrupt services by sending specially crafted requests to affected systems. The attack exploits a weakness in how the ActionForm component handles multipart/form-data, potentially leading to a denial-of-service. Organizations relying on older versions of Apache Struts with specific BeanUtils configurations face this risk.
- Attackers require low skill.
- No access or conditions needed.
- Business risk is denial of service.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Apache Struts, related to ActionForm and BeanUtils, can allow remote attackers to cause a denial-of-service. The issue arises from how multipart/form-data is handled, potentially leading to service disruption if exploited. Organizations should prioritize addressing this to maintain operational continuity and prevent system instability.
- Identify affected Struts and BeanUtils assets.
- Limit external access to vulnerable systems.
- Implement vendor fixes and validate.
- Monitor for related denial-of-service events.
