CVE-2016-3178 in MiniSSDPd
Summary
by MITRE
The processRequest function in minissdpd.c in MiniSSDPd 1.2.20130907-3 allows local users to cause a denial of service (out-of-bounds memory access and daemon crash) via vectors involving a negative length value.
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Analysis
by VulDB Data Team • 11/15/2022
The vulnerability identified as CVE-2016-3178 resides within the MiniSSDPd software implementation, specifically in the processRequest function located in the minissdpd.c file. This daemon serves as a Simple Service Discovery Protocol server implementation that enables devices to discover services on a network. The flaw manifests when the software processes incoming requests without proper validation of input parameters, creating a scenario where malicious local users can manipulate the system through crafted negative length values. This particular implementation weakness represents a classic buffer overflow condition that occurs during memory allocation operations, where the software fails to validate that the length parameter remains within acceptable positive bounds before proceeding with memory operations.
The technical exploitation of this vulnerability occurs through a local privilege escalation vector that leverages improper input validation mechanisms. When MiniSSDPd receives a malformed request containing a negative length value, the processRequest function attempts to allocate memory or perform operations using this invalid parameter, resulting in out-of-bounds memory access patterns. This type of vulnerability falls under CWE-129, which specifically addresses insufficient validation of length parameters, and represents a direct violation of secure coding principles that mandate input sanitization and parameter validation. The daemon crashes as a result of this memory corruption, leading to a denial of service condition that affects the entire network discovery service functionality. The vulnerability is particularly concerning because it operates at the daemon level, meaning that any local user with access to the system can potentially exploit this weakness to disrupt network services that depend on SSDP functionality.
The operational impact of CVE-2016-3178 extends beyond simple service disruption, as it can compromise the availability of network discovery mechanisms that many devices and applications rely upon for proper operation. Network devices that depend on SSDP for service discovery, such as printers, routers, and other networked equipment, may experience complete service outages when the MiniSSDPd daemon crashes. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1499.004, which involves network denial of service attacks, and represents a low-effort method for attackers to disrupt network operations. The local nature of the vulnerability means that even basic user accounts can exploit this weakness, making it particularly dangerous in multi-user environments where privilege separation is not properly enforced. The vulnerability's impact is further amplified in environments where MiniSSDPd serves as a critical component of network infrastructure, as it can effectively disable network discovery services across entire networks.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected software version, as the original vendor has released updates that correct the input validation issue. System administrators should implement proper input sanitization measures that validate all length parameters before processing, ensuring that negative values are rejected or converted to acceptable positive values. The fix typically involves adding boundary checks in the processRequest function to verify that length parameters remain within valid ranges before any memory allocation or processing occurs. Additionally, implementing proper access controls and privilege separation can reduce the attack surface, as local users should not be able to directly influence daemon operations without proper authorization. Security monitoring should be enhanced to detect unusual patterns in network discovery service behavior that may indicate exploitation attempts, while regular vulnerability assessments should be conducted to identify similar input validation weaknesses in other network services. The remediation process should also include implementing proper error handling mechanisms that prevent crash conditions from occurring when invalid input is processed, as outlined in industry best practices for secure system design.