Jackson-databind RCE with Default Typing and Log4j-extra
Severe, but no confirmed exploitation yet. Schedule remediation in your next patch cycle and apply mitigations if you're exposed.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.10. When Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has the apache-log4j-extra (version 1.2.x) jar in the classpath, and an attacker can provide a JNDI service to access, it is possible to make the service execute a malicious payload.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Immediately review and disable Default Typing in FasterXML jackson-databind configurations, both globally and for specific properties, if it is not strictly necessary. Implement strict network egress filtering to prevent vulnerable applications from initiating outbound JNDI connections to untrusted external services. Enhance monitoring for suspicious process activity or unusual outbound network connections originating from systems running affected jackson-databind and log4j-extra combinations.
The permanent resolution is to upgrade FasterXML jackson-databind to a version greater than 2.9.10 (e.g., 2.9.10.x, 2.10.0, or newer patched releases). Review application dependencies and remove the apache-log4j-extra (version 1.2.x) jar from the classpath if it is not actively required. Prioritize patching all systems that combine vulnerable jackson-databind versions with apache-log4j-extra and exposed JSON endpoints.
An attacker can achieve arbitrary remote code execution on the vulnerable server by exploiting the deserialization vulnerability. This allows full system compromise, enabling data exfiltration, service disruption, or further network penetration. The business consequences include significant data breaches, operational downtime, and severe reputational damage.
Other CVEs affecting debian linux
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