CVE-2016-0440 in Solaris
Summary
by MITRE
Unspecified vulnerability in Oracle Sun Solaris 11 allows remote attackers to affect availability via vectors related to NFSv4.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 07/05/2022
The vulnerability identified as CVE-2016-0440 represents a significant security flaw within Oracle Sun Solaris 11 operating systems that specifically impacts the Network File System version 4 implementation. This issue manifests as an unspecified weakness that enables remote attackers to compromise system availability, potentially disrupting critical network services and data access operations. The vulnerability resides within the NFSv4 protocol handling mechanisms, which form a fundamental component of distributed file systems in enterprise environments where Solaris systems are commonly deployed.
The technical nature of this vulnerability lies in the improper handling of NFSv4 requests or responses within the Solaris kernel implementation. Attackers can exploit this weakness by crafting specific network packets or file operations that trigger unexpected behavior in the NFS daemon or kernel modules responsible for processing NFSv4 transactions. The unspecified nature of the vulnerability description suggests that the exact mechanism of exploitation may involve multiple potential attack vectors including malformed packet structures, resource exhaustion scenarios, or improper state management during NFSv4 session handling. This type of vulnerability typically falls under the category of availability attacks rather than confidentiality or integrity breaches, as the primary impact is system disruption rather than unauthorized data access.
The operational impact of CVE-2016-0440 extends beyond simple service disruption to potentially compromise entire network infrastructure dependencies. Organizations relying on Solaris 11 systems for file sharing, application deployment, or data storage services face significant risk when this vulnerability is exploited. The availability compromise can result in extended downtime for critical applications, data unavailability for end users, and cascading failures across interconnected systems that depend on NFSv4 services. In enterprise environments, this vulnerability could affect database servers, application servers, and storage arrays that utilize NFSv4 protocols for data access, potentially leading to business continuity issues and service level agreement violations.
Mitigation strategies for this vulnerability require immediate patching of affected Solaris 11 systems through Oracle's official security updates. Organizations should also implement network segmentation to limit NFSv4 service exposure, disable unnecessary NFSv4 features, and monitor network traffic for suspicious NFSv4 activity patterns. The vulnerability aligns with CWE-119 which addresses improper access to memory, and may relate to ATT&CK technique T1499.001 for network denial of service attacks. System administrators should also consider implementing intrusion detection systems to monitor for exploitation attempts and establish incident response procedures specific to NFS service disruptions. Given the nature of the vulnerability, regular security assessments of network services and proper access controls should be maintained to reduce the attack surface and prevent unauthorized exploitation attempts.