CVE-2017-10895 in sDNSProxy.exe
Summary
by MITRE
sDNSProxy.exe ver1.1.0.0 and earlier allows remote attackers to cause a denial of service via unspecified vectors.
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Analysis
by VulDB Data Team • 12/11/2019
The vulnerability identified as CVE-2017-10895 affects sDNSProxy.exe version 1.1.0.0 and earlier implementations, representing a critical denial of service weakness within network infrastructure software. This particular flaw manifests in the DNS proxy service that operates as a network component responsible for forwarding DNS queries between clients and authoritative servers. The unspecified vectors suggest that multiple attack surfaces within the software could potentially trigger the service disruption, making the vulnerability particularly concerning for security professionals who must account for various potential exploitation methods. The affected software likely operates at the network layer, processing DNS requests and responses while maintaining connections to upstream DNS servers, creating numerous potential points of failure that attackers could exploit to terminate legitimate service operations. Such a vulnerability directly impacts network availability and can cause cascading effects throughout dependent systems that rely on consistent DNS resolution services.
The technical implementation of this denial of service vulnerability stems from inadequate input validation and error handling mechanisms within the sDNSProxy.exe application. When processing incoming DNS requests, the software fails to properly validate incoming data structures or handle malformed responses from upstream servers, leading to potential crashes or resource exhaustion that results in complete service termination. This weakness aligns with common software security flaws categorized under CWE-20, which addresses "Improper Input Validation" and CWE-400, which covers "Uncontrolled Resource Consumption." The vulnerability operates at the application level where DNS traffic is processed, making it particularly dangerous as it can be triggered through standard network communication without requiring privileged access or complex exploitation techniques. Attackers can potentially leverage this weakness by sending malformed DNS packets, triggering buffer overflows, or exploiting memory management issues that cause the proxy service to crash and restart repeatedly, effectively denying legitimate users access to DNS resolution services.
The operational impact of this vulnerability extends beyond simple service interruption, creating significant business continuity risks for organizations relying on stable DNS infrastructure. Network administrators may experience unexpected service outages that can affect thousands of users simultaneously, particularly in enterprise environments where DNS resolution is critical for authentication, email services, web browsing, and internal application access. The vulnerability can be exploited remotely without requiring authentication, making it an attractive target for malicious actors seeking to disrupt network operations. Organizations may face increased operational overhead as security teams must monitor for exploitation attempts, implement emergency patches, and potentially isolate affected systems while maintaining service availability. The impact is further compounded when considering that DNS proxies often serve as critical components in network security architectures, where their failure can expose networks to additional risks such as DNS tunneling attacks or unauthorized access attempts. This vulnerability also affects compliance requirements in regulated environments where service availability is mandated, potentially resulting in regulatory penalties and loss of customer trust.
Mitigation strategies for CVE-2017-10895 should focus on immediate software updates and implementation of network-level protective measures. Organizations must prioritize upgrading to sDNSProxy.exe versions that address this vulnerability, as the original affected versions likely contain fundamental flaws in their network processing code that cannot be adequately patched through configuration changes alone. Network administrators should implement rate limiting and connection monitoring to detect unusual patterns that may indicate exploitation attempts, while also configuring proper logging and alerting mechanisms to identify service disruptions quickly. The implementation of redundant DNS proxy services can provide failover capabilities that maintain service availability even when individual instances are compromised. Security controls should also include network segmentation to limit the blast radius of potential exploitation, ensuring that even if one proxy instance is compromised, other network services remain unaffected. Organizations should consider implementing intrusion detection systems specifically configured to monitor for DNS-related anomalies that may indicate exploitation attempts, while also establishing incident response procedures that can rapidly address service disruptions. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other network infrastructure components, following the principles outlined in the MITRE ATT&CK framework under the network service scanning and remote service exploitation domains. Additionally, implementing proper access controls and network monitoring can help detect unauthorized attempts to exploit this vulnerability while maintaining operational visibility into network activities.