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CVE ID: CVE-2024-21216
CVE-2024-21216 is a critical security vulnerability affecting the Oracle WebLogic Server, part of the Oracle Fusion Middleware product family. The vulnerability resides in the Core component of the server and is triggered by insufficient validation of incoming data processed through the T3 and IIOP protocols.
WebLogic Server is a widely used Java EE application server that supports enterprise-level deployments, providing features such as web hosting, EJB containers, JMS messaging, and transaction management. The T3 and IIOP protocols are integral to WebLogic’s communication infrastructure, facilitating remote method invocations and object exchange between clients and the server.
The core issue is a deserialization flaw. When the T3 or IIOP protocols are enabled, an unauthenticated attacker with network access can craft a malicious request and send it to the vulnerable server. Because WebLogic does not strictly filter or sanitize serialized data received via these protocols, the server may inadvertently deserialize the attacker-controlled payload, leading to the execution of arbitrary code on the target system.
This vulnerability is classified as “easily exploitable” because it requires no authentication, no user interaction, and has low attack complexity. The attacker needs only network connectivity to the WebLogic Server’s T3/IIOP endpoints, typically exposed on ports 7001 or 7002.
Successful exploitation can result in a complete takeover of the Oracle WebLogic Server instance, allowing the attacker to compromise the confidentiality, integrity, and availability of the affected system and any hosted applications. The vulnerability has a CVSS 3.1 base score of 9.8 (Critical), with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Oracle has officially released patches as part of its October 2024 Critical Patch Update (CPU). Affected versions are Oracle WebLogic Server 12.2.1.4.0 and 14.1.1.0.0. Active exploitation in the wild has been reported, underscoring the urgency for immediate remediation.
DailyCVE Form:
Platform: Oracle WebLogic
Version: 12.2.1.4.0, 14.1.1.0.0
Vulnerability: Deserialization RCE
Severity: Critical
date: 2024-10-15
Prediction: Patch released Oct 2024
What Undercode Say
Undercode analysts emphasize the importance of proactive vulnerability management, continuous monitoring, and rapid patch deployment. The following commands and codes are recommended for detection and verification:
Local version and patch check:
cd /Oracle/Middleware/wlserver_10.3/server/lib java -cp weblogic.jar weblogic.version
The absence of patch information in the output indicates a vulnerable installation.
T3 protocol detection using Nmap:
nmap -n -v -Pn -sV [bash] -p 7001,7002 --script=weblogic-t3-info.nse
This script detects whether the T3 protocol is enabled and whether the WebLogic version is within the affected range.
Network Intrusion Detection Systems (IDS) and Integrated Threat Sensors (UTS) can also be configured to detect exploitation attempts.
Exploit
An unauthenticated attacker can exploit this vulnerability by sending a specially crafted serialized payload over the T3 or IIOP protocol to the WebLogic server. The payload is designed to bypass input validation and trigger arbitrary code execution during deserialization.
While a public exploit may not be immediately available, the vulnerability is considered easily exploitable, and active exploitation in the wild has been confirmed. Organizations should assume threat actors are actively scanning for and targeting vulnerable instances.
Protection
Apply the official patch from Oracle immediately. Patches are available through the Oracle Support Portal (https://support.oracle.com) for customers with a valid license.
If patching is not immediately possible, implement temporary mitigations:
– Restrict or block T3/IIOP protocol access using network access control lists (ACLs) and firewalls.
– Disable T3 and IIOP protocols if not required for business operations.
– Monitor logs and network traffic for suspicious patterns, such as unexpected T3/IIOP requests.
– Deploy virtual patches using intrusion prevention systems (IPS) or web application firewalls (WAF) that have updated rule sets to block known exploitation attempts.
Impact
Successful exploitation leads to complete compromise of the Oracle WebLogic Server, including:
– Unauthorized access to sensitive data (Confidentiality impact: High)
– Ability to modify or delete critical data (Integrity impact: High)
– Full system downtime or denial of service (Availability impact: High)
The attacker can gain remote code execution capabilities, potentially leading to lateral movement within the network, deployment of malware or ransomware, and full takeover of the affected server and its hosted applications. Given the critical nature of the CVSS score (9.8) and confirmed in-the-wild exploitation, the risk to enterprise environments is severe.
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Sources:
Reported By: www.cve.org
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