Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability involves the Apache Fory serialization library, specifically when an optional feature called "out-of-band zero-copy deserialization" is enabled. If this feature is used, a flaw allows reading beyond the intended data boundaries, which could potentially lead to information disclosure or denial of service. Applications not using this specific opt-in feature are unaffected.
- A library flaw impacts data handling if a specific feature is active.
- It matters if your applications use a specialized deserialization method.
- Confirm if the specialized feature is in use before taking action.
Attack Path
How an attacker could exploit the issue
An attacker could target applications that have explicitly enabled Apache Fory's out-of-band zero-copy deserialization feature. By sending specially crafted data to these applications, an attacker could trigger a flaw in the `readAlignedVarUint()` function, causing it to read beyond the expected data boundaries. This could potentially allow an attacker to access sensitive information or disrupt application operation.
- Requires opt-in feature enabled.
- Triggers read beyond buffer bounds.
- Can lead to data access or crashes.
Live Threat
Current exploitation, exposure, and threat context
When the opt-in out-of-band zero-copy deserialization feature is enabled in Apache Fory, an out-of-bounds read vulnerability could allow an attacker to read beyond the allocated buffer. This could potentially impact the integrity of the deserialization process and lead to service instability.
- System memory data at risk.
- Via crafted serialized input data.
- Could cause denial of service.
Operational Fix
Recommended remediation, mitigation, and detection steps
Application owners and platform teams are likely responsible for addressing this critical vulnerability in Apache Fory, particularly if the opt-in out-of-band zero-copy deserialization feature is in use. The first practical step is to identify all instances of Apache Fory within your environment, confirm if the affected feature is enabled and if the instances are exposed or critical, and then ascertain the accountable owner for remediation.
- Application owners and platform teams.
- Verify Fory usage and feature enablement.
- Plan remediation or risk reduction.
