CVE-2025-57738 Overview
Apache Syncope contains a code injection vulnerability that allows a malicious administrator to execute arbitrary Groovy code on a running Apache Syncope Core instance. The product supports runtime customization through Java or Groovy implementations of internal interfaces, with Groovy classes reloaded at runtime. Insufficient isolation of Groovy execution allowed administrator-supplied code to run with full server privileges. Apache addressed the issue in versions 3.0.14 and 4.0.2 by forcing Groovy code to run inside a sandbox. The flaw is tracked as [CWE-653] (Improper Isolation or Compartmentalization).
Critical Impact
An authenticated administrator can achieve remote code execution on the Apache Syncope Core, leading to full compromise of identity management infrastructure.
Affected Products
- Apache Syncope versions prior to 3.0.14
- Apache Syncope 4.x versions prior to 4.0.2
- Deployments using Groovy-based custom implementations
Discovery Timeline
- 2025-10-20 - CVE-2025-57738 published to the National Vulnerability Database
- 2025-11-04 - Last updated in NVD database
Technical Details for CVE-2025-57738
Vulnerability Analysis
Apache Syncope is an open-source identity management system that lets administrators customize core behavior by supplying implementations of select Java interfaces. Administrators can submit these implementations as Groovy classes, which the platform compiles and reloads at runtime. The runtime reload feature makes Groovy the preferred extension language for many deployments.
The vulnerability arises because Groovy code submitted by administrators executed without isolation from the host Java Virtual Machine (JVM). An administrator with permission to manage implementations can submit Groovy code that invokes arbitrary Java APIs, including Runtime.exec, file system access, and network calls. The injected logic runs with the same privileges as the Apache Syncope Core process.
Root Cause
The root cause is improper isolation of dynamically loaded Groovy code [CWE-653]. The Groovy compilation pipeline did not enforce a sandbox that restricted available classes, methods, or system resources. Administrator-supplied scripts therefore inherited full access to the JVM and the underlying operating system.
Attack Vector
Exploitation requires a network-reachable Apache Syncope Core and valid administrator credentials. The attacker submits a malicious Groovy implementation through the administration interface or REST API. When the platform compiles and invokes the implementation, the embedded payload executes server-side. Successful exploitation grants the attacker remote code execution and full control over identities, credentials, and provisioned downstream systems managed by Syncope.
No verified public proof-of-concept code is associated with this CVE. Refer to the Apache Mailing List Thread and the Openwall OSS-Security Discussion for the official advisory.
Detection Methods for CVE-2025-57738
Indicators of Compromise
- Unexpected creation or modification of Groovy implementations under the Syncope administration console or /implementations REST endpoint
- Apache Syncope Core process spawning child processes such as sh, bash, cmd.exe, or powershell.exe
- Outbound network connections from the Syncope JVM to unfamiliar hosts shortly after implementation updates
- Administrator sessions originating from unusual IP addresses prior to implementation changes
Detection Strategies
- Audit Syncope application logs for POST and PUT requests against the implementations API and correlate with administrator identity
- Alert on JVM-spawned shell processes or process trees descending from the Syncope Core service account
- Compare deployed Groovy implementations against a known-good baseline and flag unauthorized additions
Monitoring Recommendations
- Enable verbose audit logging for all administrator role activity and forward to a centralized SIEM
- Monitor file integrity on Syncope configuration directories and any persisted Groovy script storage
- Track process and network telemetry from the host running Apache Syncope Core to detect post-exploitation behavior
How to Mitigate CVE-2025-57738
Immediate Actions Required
- Upgrade Apache Syncope to version 3.0.14 or 4.0.2, which enforce a Groovy sandbox
- Review all existing Groovy implementations and remove any that are unauthorized or unrecognized
- Rotate administrator credentials and API tokens that may have been exposed prior to patching
- Restrict administrator role assignments to the smallest set of trusted operators
Patch Information
Apache released fixed versions 3.0.14 and 4.0.2. Both releases force administrator-supplied Groovy code to execute inside a sandbox that limits access to dangerous Java APIs. Upgrade guidance is published in the Apache Mailing List Thread.
Workarounds
- Disable Groovy-based custom implementations and use compiled Java implementations only until the upgrade is complete
- Place the Apache Syncope administration interface behind a network allowlist or VPN to limit administrator access
- Enforce multi-factor authentication for all Syncope administrator accounts to reduce the risk of credential abuse
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
