CVE-2012-4428 in OpenSLP
Summary
by MITRE
openslp: SLPIntersectStringList()' Function has a DoS vulnerability
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Analysis
by VulDB Data Team • 12/29/2024
The vulnerability identified as CVE-2012-4428 affects the openslp software implementation and specifically targets the SLPIntersectStringList() function which is responsible for processing string lists during service location protocol operations. This function processes input data from network sources and performs intersection operations between string lists, making it a critical component in the service discovery mechanism. The flaw manifests when the function fails to properly validate input parameters, particularly when handling malformed or excessively large string lists that could trigger unexpected behavior during processing. The vulnerability resides in the software's inability to gracefully handle edge cases in string list operations, leading to potential denial of service conditions where legitimate service requests may be disrupted or rejected.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the SLPIntersectStringList() function. When processing string lists that contain malformed entries or unusually long sequences, the function may enter infinite loops or consume excessive system resources without proper boundary checks. This behavior aligns with common software security weaknesses categorized under CWE-129, which deals with insufficient validation of length of input buffers, and CWE-770, which addresses allocation of resources without proper limits. The function's lack of proper bounds checking and resource exhaustion protection creates an exploitable condition where an attacker can craft malicious input sequences that cause the software to consume excessive CPU cycles or memory resources, ultimately resulting in system instability or complete service unavailability.
The operational impact of this vulnerability extends beyond simple service disruption as it affects the reliability and availability of service location protocols within network environments. When exploited, the denial of service condition can prevent legitimate clients from discovering network services, effectively breaking service discovery mechanisms that many applications depend upon for proper operation. This vulnerability particularly impacts environments where openslp is deployed as a core component of service location infrastructure, such as in enterprise networks, IoT deployments, or systems utilizing service location protocol for device discovery and communication. The attack surface is broad as any system that processes SLP messages containing string lists could be affected, including network printers, servers, and mobile devices that utilize SLP for service discovery. Organizations relying on this functionality may experience cascading failures where the unavailability of service discovery mechanisms impacts downstream applications and user experiences.
Mitigation strategies for CVE-2012-4428 should focus on both immediate patching and operational hardening measures. The most effective solution involves applying the vendor-provided security patches that address the specific input validation issues within the SLPIntersectStringList() function. Organizations should also implement network monitoring to detect anomalous SLP traffic patterns that may indicate exploitation attempts. Input sanitization measures including length validation, resource limit enforcement, and proper error handling should be implemented at multiple layers of the network stack. The vulnerability demonstrates characteristics consistent with ATT&CK technique T1499.004, which involves network disruption through resource exhaustion, making it important for security teams to monitor for unusual resource consumption patterns. Additionally, implementing network segmentation and access controls around SLP-enabled services can limit the impact of potential exploitation while maintaining operational security posture. Regular security assessments of service location protocols and input validation mechanisms should be conducted to prevent similar vulnerabilities from emerging in other components of the system infrastructure.