Horizon Alert
Summary of the vulnerability and why it matters
This advisory describes a critical vulnerability in the Jackson databind library, a common component for handling JSON data. An attacker could potentially exploit this by sending specially crafted data that bypasses security checks, leading to severe consequences including command execution. The primary concern is to confirm if this technology is used within our environment and if it is exposed to external inputs.
- Data processing library allows malicious input.
- Critical vulnerability could lead to command execution.
- Confirm usage and external exposure of this library.
Attack Path
How an attacker could exploit the issue
An attacker can exploit this vulnerability by sending specially crafted JSON data to an application that uses the Jackson databind library. This data, processed with default typing enabled, can trick the library into deserializing unexpected classes, potentially leading to arbitrary command execution. This is possible because the library's validation of class names within generic types is insufficient, allowing for the bypass of security checks.
- Unauthenticated network access required.
- Deserializing attacker-controlled JSON data.
- Arbitrary command execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an attacker to execute arbitrary commands on a system when processing specially crafted JSON data. This occurs when the Jackson databind library incorrectly validates class names within generic type arguments, bypassing security checks. The risk is realized when the affected library is used in applications that deserialize untrusted input, particularly when configured for default typing or integrating with frameworks like Spring that can load external XML.
- Arbitrary command execution.
- Deserialization of untrusted input.
- Compromised application account.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Jackson Databind affects systems processing JSON data, particularly those using class-name polymorphism with default typing. Application owners, platform teams, and security teams should collaborate to identify affected instances. The initial step involves inventorying where Jackson Databind is deployed, assessing exposure to untrusted input, and confirming business criticality before planning remediation.
- Identify owners and scope of affected systems.
- Verify exposed Jackson Databind instances.
- Plan risk-based remediation actions.
