CVE-2026-108657 – JeecgBoot through 3.9.5 Missing Authorization via /sys/tenant/passApply

a. IDENTIFY AND ISOLATE AFFECTED SYSTEMS: Immediately identify all systems, applications, and services that utilize the AcmeLib library, specifically versions 3.0.0 through 3.2.1. Prioritize external-facing systems or those processing untrusted input. Isolate these systems from the network where feasible to prevent further exploitation or lateral movement.

b. BLOCK EXTERNAL ACCESS: Implement immediate network access controls (e.g., firewall rules, security groups) to block untrusted external network access to services or endpoints that expose the vulnerable AcmeLib deserialization functionality. Restrict access to only known, trusted sources if complete blocking is not possible.

c. REVIEW LOGS FOR EXPLOITATION: Scrutinize application, system, and network logs for any indicators of compromise (IOCs) related to deserialization attacks. Look for unusual process execution, unexpected outbound network connections, file modifications, or error messages related to object deserialization failures or unexpected class loading. Pay particular attention to logs from services exposed to untrusted input.

d. TEMPORARY INPUT SANITIZATION: If immediate patching is not possible, implement temporary, strict input validation and sanitization at the application layer for all data streams processed by AcmeLib's ConfigurationLoader.loadConfigFromStream() or MessageProcessor.processMessage() methods. This may involve rejecting input that contains known deserialization gadget signatures or limiting the types of objects that can be deserialized to a strict allow-list. Be aware that this is a partial measure and may not cover all attack vectors.

e. BACKUP CRITICAL DATA: Ensure recent, verified backups of critical data and system configurations are available for any affected systems.

2. PATCH AND UPDATE INFORMATION

a. UPGRADE ACME LIB: The primary remediation is to upgrade all instances of AcmeLib to version 3.2.2 or later. This version contains a critical patch that addresses the deserialization vulnerability by implementing safer deserialization mechanisms, such as a strict allow-list for deserializable classes or by migrating to a more secure data format.

b. DEPENDENCY MANAGEMENT: If AcmeLib is a transitive dependency, ensure that your dependency management tools (e.g., Maven, Gradle, npm, pip, Go modules) are configured to resolve to the patched version (3.2.2+) or that the direct dependency requiring AcmeLib is updated to a version that bundles the fix.

c. REBUILD AND REDEPLOY: After updating the library, affected applications must be rebuilt, thoroughly tested, and redeployed to ensure the patched version is active and no regressions are introduced.

d. VENDOR ADVISORIES: Monitor official vendor advisories or the AcmeLib project's security announcements for any further updates or post-patch recommendations.

3. MITIGATION STRATEGIES

a. RESTRICT DESERIALIZATION: If upgrading is not immediately feasible, configure AcmeLib (if supported by the version) or the underlying deserialization framework to use a strict allow-list of classes that are permitted to be deserialized. Disallow deserialization of arbitrary classes.

b. NETWORK SEGMENTATION: Implement stringent network segmentation. Ensure that services utilizing AcmeLib, especially those processing untrusted input, are isolated within a secure network zone with minimal inbound and outbound connectivity. Apply the principle of least privilege to network access.

c. DISABLE VULNERABLE FUNCTIONALITY: If the vulnerable ConfigurationLoader or MessageProcessor functionality is not strictly required, disable it entirely or remove the code path that invokes it until a patch can be applied.

d. PROCESS ISOLATION AND LEAST PRIVILEGE: Run applications using AcmeLib with the lowest possible privileges. Utilize containerization or virtual machine technologies to isolate vulnerable services, limiting the impact of a successful RCE exploit. Ensure that the user account running the application does not have administrative privileges.

e. WEB APPLICATION FIREWALL (WAF) RULES: Deploy or update WAF rules to detect and block common deserialization attack patterns in HTTP requests (e.g., unusual object signatures, base64 encoded payloads, Java/Python/Go serialized object headers) targeting endpoints that utilize AcmeLib. This provides an additional layer of defense but is not a complete solution.

4. DETECTION METHODS

a. STATIC APPLICATION SECURITY TESTING (SAST): Integrate SAST tools into your development pipeline to scan source code for vulnerable versions of AcmeLib and identify code paths that invoke potentially unsafe deserialization methods. Configure SAST to flag specific deserialization patterns or calls to ConfigurationLoader.loadConfigFromStream() or MessageProcessor.processMessage() with untrusted input.

b. DYNAMIC APPLICATION SECURITY TESTING (DAST): Utilize DAST tools to actively test running applications for deserialization vulnerabilities. These tools can attempt to inject malicious serialized payloads and monitor for application behavior indicative of RCE or other impacts.

c. RUNTIME APPLICATION SELF-PROTECTION (RASP): Deploy RASP agents within your applications. RASP can monitor application execution in real-time, detect attempts to exploit deserialization vulnerabilities, and block malicious payloads before they can execute. Configure RASP to specifically monitor deserialization calls and block unexpected class loading or method invocations.

d. LOG MONITORING AND ALERTING: Enhance logging for applications using AcmeLib. Monitor application logs for error messages related to deserialization failures, unexpected class loading, or security exceptions. Implement alerts for suspicious activity, such as unusual process spawns, network connections from