CVE-2019-5619 in AASync
Summary
by MITRE
AASync.com AASync version 2.2.1.0 suffers from an instance of CWE-121: Stack-based Buffer Overflow.
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Analysis
by VulDB Data Team • 06/04/2024
The vulnerability identified as CVE-2019-5619 affects AASync.com AASync version 2.2.1.0 and represents a critical stack-based buffer overflow condition classified under CWE-121. This type of vulnerability occurs when a program writes data beyond the boundaries of a statically allocated buffer on the stack, potentially allowing attackers to overwrite adjacent memory locations including return addresses, function pointers, or other critical program state information. The flaw manifests in the application's handling of input data that exceeds the allocated buffer size, creating opportunities for arbitrary code execution or system compromise.
The technical implementation of this buffer overflow vulnerability stems from inadequate input validation and bounds checking within the AASync application's memory management routines. When processing user-supplied data or malformed input streams, the software fails to properly verify that incoming data fits within predetermined buffer limits before copying or processing it. This deficiency creates a predictable memory corruption scenario where attackers can craft specific input sequences that cause the program to write beyond allocated memory boundaries, potentially overwriting the stack frame's return address or other critical metadata. The vulnerability is particularly concerning because it operates at the application level without requiring elevated privileges, making it accessible to remote attackers who can exploit it through network-based or local input mechanisms.
The operational impact of this vulnerability extends beyond simple denial of service scenarios to encompass potential complete system compromise and data exfiltration capabilities. Successful exploitation of the buffer overflow could enable attackers to execute arbitrary code with the privileges of the affected application, potentially leading to unauthorized access to sensitive data, system manipulation, or further network reconnaissance activities. The vulnerability affects the core synchronization functionality of the AASync application, which could result in unauthorized data modification or complete service disruption. Organizations relying on this synchronization software face risks including credential theft, system infiltration, and potential lateral movement within their network infrastructure, particularly if the application runs with elevated privileges or accesses sensitive system resources.
Mitigation strategies for CVE-2019-5619 should prioritize immediate patch deployment from the vendor, as this represents a critical vulnerability requiring urgent attention. Organizations should implement network segmentation and access controls to limit exposure of vulnerable systems, while also monitoring for suspicious network activity or unauthorized access attempts. The implementation of address space layout randomization, stack canaries, and other exploit mitigation techniques can provide additional defense-in-depth measures. Security teams should conduct thorough vulnerability assessments to identify all instances of the affected AASync version within their environment and establish incident response procedures for potential exploitation attempts. Regular security testing including penetration testing and static code analysis should be performed to identify similar buffer overflow vulnerabilities in other applications and systems. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, emphasizing the need for comprehensive security controls to prevent exploitation and maintain system integrity.