CVE-2018-8065 in SyncBreeze Enterprise
Summary
by MITRE
An issue was discovered in the web server in Flexense SyncBreeze Enterprise 10.6.24. There is a user mode write access violation on the syncbrs.exe memory region that can be triggered by rapidly sending a variety of HTTP requests with long HTTP header values or long URIs.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 02/02/2025
The vulnerability identified as CVE-2018-8065 resides within the Flexense SyncBreeze Enterprise 10.6.24 web server component, specifically manifesting as a user mode write access violation in the syncbrs.exe memory region. This critical flaw represents a memory corruption vulnerability that fundamentally compromises the stability and security of the affected system. The issue emerges from the web server's inadequate handling of malformed HTTP requests, particularly those containing excessively long header values or URI components, creating a pathway for potential exploitation through carefully crafted network traffic.
The technical implementation of this vulnerability stems from insufficient input validation mechanisms within the SyncBreeze web server's request processing pipeline. When the server receives HTTP requests with unusually long header values or extended URIs, the parsing routine fails to properly bounds-check memory allocations, leading to a write access violation that occurs in user mode rather than kernel mode. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, though it manifests as a more complex memory corruption issue that can potentially allow for arbitrary code execution. The rapid succession of varied HTTP requests amplifies the exploitability by overwhelming the server's memory management routines and triggering the specific memory access violation pattern.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable remote code execution and privilege escalation within the affected system. Attackers can leverage this flaw to crash the web server service, causing denial of service conditions that may persist until manual intervention occurs. More critically, the memory corruption nature suggests potential for exploitation through carefully crafted payloads that could manipulate the execution flow of the syncbrs.exe process, potentially leading to full system compromise. The vulnerability's accessibility through standard network protocols means that any entity with network access to the affected server could potentially exploit this weakness, making it particularly dangerous in enterprise environments where such services may be exposed to untrusted networks.
Mitigation strategies for CVE-2018-8065 should prioritize immediate patching of the SyncBreeze Enterprise software to the latest available version that addresses this memory corruption vulnerability. Organizations should implement network-level controls including firewall rules that restrict access to the affected web server ports and consider implementing intrusion detection systems that can identify and block suspicious HTTP request patterns. Additionally, the implementation of input validation controls at the network perimeter can help filter out requests containing excessively long headers or URIs that may trigger the vulnerability. Security monitoring should focus on detecting unusual patterns of HTTP requests that rapidly cycle through different header lengths or URI structures, as these patterns may indicate exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, emphasizing the need for comprehensive network security controls and regular vulnerability assessments to prevent unauthorized exploitation of such memory corruption flaws. Organizations should also consider implementing application whitelisting policies and regular security audits to ensure that the patched software remains properly deployed and that no legacy versions continue to operate within the network infrastructure.