CVE-2021-2420 in Outside In Technology
Summary
by MITRE • 07/21/2021
Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside In Filters). The supported version that is affected is 8.5.5. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Outside In Technology. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Outside In Technology accessible data as well as unauthorized read access to a subset of Oracle Outside In Technology accessible data. Note: Outside In Technology is a suite of software development kits (SDKs). The protocol and CVSS Base Score depend on the software that uses Outside In Technology. The CVSS score assumes that the software passes data received over a network directly to Outside In Technology, but if data is not received over a network the CVSS score may be lower. CVSS 3.1 Base Score 6.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N).
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Analysis
by VulDB Data Team • 07/24/2021
The vulnerability identified as CVE-2021-2420 resides within Oracle Outside In Technology, a comprehensive suite of software development kits that facilitate document processing and conversion capabilities within Oracle Fusion Middleware environments. This particular flaw manifests in the Outside In Filters component of version 8.5.5, representing a significant security weakness that can be exploited by unauthenticated attackers without requiring any prior authorization or credentials. The vulnerability's exploitation requires only network access via HTTP protocols, making it particularly concerning as it can be leveraged from remote locations without physical or network-level privileges. The affected component serves as a critical processing layer for document handling within Oracle Fusion Middleware, making this vulnerability potentially devastating for organizations relying on these technologies for business-critical document management and processing operations.
The technical nature of this vulnerability stems from insufficient input validation and access control mechanisms within the Outside In Technology filters, which allows malicious actors to manipulate data processing flows through crafted HTTP requests. The flaw enables attackers to perform unauthorized operations including data creation, deletion, and modification against critical system data, while simultaneously providing read access to sensitive information within the accessible data scope. The CVSS 3.1 scoring system assigns a base score of 6.5, reflecting the medium severity classification that balances the difficulty of exploitation with the potential impact. The vector assessment (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N) indicates network-based attack surface with high attack complexity, no privilege requirements, and no user interaction needed, while the impact assessment shows low confidentiality impact, high integrity impact, and no availability impact. This vulnerability operates under CWE-284, which specifically addresses improper access control issues, and aligns with ATT&CK technique T1078 for valid accounts and T1566 for spearphishing with links, though the latter is more relevant for initial access vectors that may lead to exploitation of this specific flaw.
The operational impact of CVE-2021-2420 extends beyond simple data integrity concerns, as it can potentially compromise entire document processing pipelines and expose sensitive information within Oracle Fusion Middleware environments. Organizations utilizing this technology for document management, content processing, or business intelligence operations face significant risk of data breaches, unauthorized modifications to critical business documents, and potential exposure of confidential information. The vulnerability's ability to affect all accessible data within the Outside In Technology scope means that attackers could gain access to sensitive corporate documents, financial records, personal information, or other protected data depending on the specific implementation and data access controls within individual deployments. The fact that this vulnerability can be exploited without authentication makes it particularly dangerous for environments where document processing systems are exposed to untrusted networks or where insufficient network segmentation exists between internal systems and external access points. Security teams must consider the potential for cascading effects where exploitation of this vulnerability could lead to further system compromise through subsequent attacks targeting other components within the Oracle Fusion Middleware ecosystem, as the compromised system could serve as a launch point for additional reconnaissance and exploitation activities.
Mitigation strategies for CVE-2021-2420 should prioritize immediate patching of affected Oracle Outside In Technology installations to version 8.5.6 or later, which contains the necessary security fixes to address the access control vulnerabilities. Organizations should implement network-level restrictions to limit HTTP access to Outside In Technology components, particularly by blocking unnecessary external access and implementing proper firewall rules to restrict communication paths. Additional protective measures include deploying web application firewalls to monitor and filter HTTP requests targeting affected components, implementing network segmentation to isolate document processing systems, and conducting thorough network monitoring to detect anomalous access patterns that may indicate exploitation attempts. Security configurations should include disabling unnecessary features and services within the Outside In Technology SDKs, implementing robust input validation for all data processed through these components, and establishing comprehensive audit logging to track access and modification activities. Organizations should also consider implementing automated vulnerability scanning tools to identify any remaining instances of the vulnerable version within their environment and ensure proper access controls are implemented at the application level to prevent unauthorized access to document processing capabilities. Regular security assessments and penetration testing should be conducted to verify that the implemented mitigations are effective and that no additional vulnerabilities exist within the broader Oracle Fusion Middleware ecosystem that could be exploited in conjunction with this flaw.