Horizon Alert
Summary of the vulnerability and why it matters
A security vulnerability has been identified in Zammad, a system used for customer support, which could allow unauthorized users to upload malicious content to article drafts. This issue stems from the way Zammad's upload cache identifies content, making it potentially guessable by attackers. The primary concern is to confirm if your organization uses this specific software and is exposed to this risk.
- Insecure file uploads in Zammad.
- Could allow unauthorized content injection.
- Confirm Zammad usage and exposure.
Attack Path
How an attacker could exploit the issue
An attacker could leverage a weakness in how Zammad handles uploaded files to bypass access controls. By guessing or brute-forcing specific identifiers, an unauthorized attacker could upload malicious content into article drafts, potentially leading to significant data compromise.
- No authentication required.
- Guessable identifiers to upload files.
- Unauthorized access to article drafts.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated attacker to upload malicious content to article drafts that they should not have access to, potentially impacting the integrity of stored data.
- Article drafts.
- Brute-forceable form IDs.
- Malicious content uploaded to drafts.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability impacts Zammad instances, specifically their upload cache mechanism. Application owners responsible for Zammad, in conjunction with infrastructure or platform teams managing its deployment, should prioritize understanding the exposure of their Zammad instances. The initial step involves identifying all deployed Zammad systems, determining their internet reachability, and confirming their criticality to business operations to inform risk-based remediation planning.
- Application owners to coordinate remediation.
- Verify Zammad instance reachability and criticality.
- Plan Zammad updates during maintenance windows.
