CVE-2016-5516 in Database Server
Summary
by MITRE
Unspecified vulnerability in the Kernel PDB component in Oracle Database Server 12.1.0.2 allows local users to affect availability via unknown vectors.
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Analysis
by VulDB Data Team • 09/26/2022
The vulnerability identified as CVE-2016-5516 resides within the Kernel PDB component of Oracle Database Server version 12.1.0.2, representing a critical security flaw that affects the overall availability of the database system. This unspecified weakness in the kernel pdb module creates a potential attack surface that local users can exploit to disrupt database operations, though the exact technical mechanisms remain undisclosed in the public vulnerability description. The kernel pdb component serves as a fundamental element within Oracle's database architecture responsible for managing database processes and system resources, making its compromise particularly dangerous for database availability and integrity.
The technical nature of this vulnerability places it within the realm of local privilege escalation and system availability attacks, where an attacker with local access to the database server can manipulate core kernel processes to cause service disruption or complete system unavailability. This type of vulnerability typically falls under CWE-264, which encompasses permissions, privileges, and access control issues, and may also relate to CWE-119, memory corruption vulnerabilities, depending on the specific exploitation method. The lack of detailed vector information suggests that the vulnerability could involve process manipulation, memory corruption, or resource exhaustion techniques that would cause the database kernel to crash or become unresponsive.
From an operational impact perspective, this vulnerability presents significant risks to database availability and business continuity, particularly in environments where Oracle Database Server 12.1.0.2 is deployed. Local users with access to the database server can potentially cause complete service outages, leading to data unavailability, application downtime, and potential financial losses. The impact extends beyond simple service disruption as database availability issues can cascade through entire enterprise systems, affecting applications that depend on database connectivity and potentially causing widespread operational failures. The vulnerability's local nature means that it can be exploited by any user with access to the database server, including potentially malicious insiders or compromised accounts with local system access.
Organizations should implement immediate mitigation strategies including applying the relevant Oracle security patches and updates, conducting comprehensive vulnerability assessments, and implementing strict access controls to limit local system access to database servers. Network segmentation and monitoring should be enhanced to detect potential exploitation attempts, while system administrators should closely monitor database processes for unusual activity patterns that might indicate exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1068, legitimate credentials, and potentially T1499, endpoint disruption, as local users can leverage their existing access to cause system availability issues. Regular security audits and privilege reviews are essential to prevent unauthorized local access that could lead to exploitation of this vulnerability. Organizations should also consider implementing database activity monitoring solutions to detect anomalous behavior patterns that might indicate attempted exploitation of kernel-level vulnerabilities.