CVE-2003-1070 in Solaris
Summary
by MITRE
Unknown vulnerability in rpcbind for Solaris 2.6 through 9 allows remote attackers to cause a denial of service (rpcbind crash).
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Analysis
by VulDB Data Team • 08/27/2019
The vulnerability identified as CVE-2003-1070 represents a critical denial of service flaw within the rpcbind service component of Solaris operating systems spanning versions 2.6 through 9. This issue resides within the remote procedure call binding daemon that serves as a crucial middleware component for network service discovery and registration in Unix-like systems. The rpcbind service operates by maintaining a registry of port numbers for rpc services, enabling clients to discover and connect to remote services without requiring prior knowledge of specific port assignments. The vulnerability manifests when remote attackers can exploit malformed input or improper handling of network requests to trigger a crash in the rpcbind process, thereby disrupting critical network services that depend on rpc functionality. This flaw particularly affects systems where rpcbind is actively running and serving as the central registry for rpc services, creating a cascading effect that can impact multiple dependent applications and services across the network infrastructure.
The technical nature of this vulnerability stems from inadequate input validation and error handling within the rpcbind daemon's processing routines. When the service receives malformed or unexpected network packets, particularly those designed to exploit buffer handling inconsistencies or improper state management, the rpcbind process can enter an undefined state leading to abrupt termination. This behavior aligns with common software security weaknesses categorized under CWE-248, which addresses "Uncaught Exception" conditions where programs fail to properly handle exceptional circumstances during execution. The vulnerability demonstrates characteristics of improper resource management where the service fails to maintain proper state consistency when processing external inputs, resulting in memory corruption or invalid pointer dereferences that ultimately lead to process termination. The flaw operates at the network protocol level where rpcbind listens for requests on specific ports and processes binding information for rpc services, making it accessible to any remote attacker with network connectivity to the affected system.
The operational impact of CVE-2003-1070 extends far beyond a simple service disruption, as rpcbind serves as a foundational component for numerous network services including NFS, NIS, and other rpc-based applications. When the rpcbind daemon crashes, it creates a cascading failure that can disable critical file sharing services, user authentication systems, and network management functions that rely on rpc communication protocols. This vulnerability particularly affects enterprise environments where Solaris systems host mission-critical applications and services, potentially leading to extended downtime and productivity losses. The remote nature of the attack means that adversaries can exploit this flaw from outside the network perimeter without requiring local system access or authentication credentials, making it an attractive target for malicious actors seeking to disrupt network operations. Organizations running affected Solaris versions face significant risk of service degradation or complete network service outages, especially in environments where rpc-based services are extensively utilized for system administration and data sharing operations.
Mitigation strategies for CVE-2003-1070 should focus on immediate system hardening and patch management approaches to address the underlying rpcbind vulnerability. The primary recommendation involves applying the appropriate security patches provided by Sun Microsystems for the affected Solaris versions, which typically include enhanced input validation and improved error handling mechanisms within the rpcbind service. System administrators should also implement network segmentation and firewall rules to limit access to rpcbind ports, specifically restricting rpcbind service exposure to trusted network segments only. Additionally, monitoring and logging configurations should be enhanced to detect unusual patterns of rpcbind service restarts or connection attempts that may indicate exploitation attempts. Organizations should consider implementing intrusion detection systems that can identify malformed rpcbind requests and alert security teams to potential exploitation activities. The vulnerability also highlights the importance of maintaining up-to-date security patches and following the principle of least privilege when configuring rpc services, ensuring that only necessary rpc services are exposed and that rpcbind operates with minimal required privileges to reduce the potential impact of successful exploitation attempts. This vulnerability demonstrates the critical importance of maintaining robust network service security practices and the potential for seemingly minor service flaws to create significant operational disruptions across complex network infrastructures.