CVE-2022-49040 in Drive Client
Summary
by MITRE • 09/26/2024
Buffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in connection management functionality in Synology Drive Client before 3.4.0-15721 allows local users with administrator privileges to crash the client via unspecified vectors.
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Analysis
by VulDB Data Team • 09/26/2024
The vulnerability identified as CVE-2022-49040 represents a classic buffer overflow condition within the Synology Drive Client software ecosystem. This issue manifests in the connection management functionality where inadequate input validation permits malicious buffer manipulation. The flaw specifically affects versions prior to 3.4.0-15721 and creates a significant security risk for systems utilizing this client software. The vulnerability classification aligns with CWE-121 which describes classic buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. This type of vulnerability falls under the broader category of memory safety issues that have long plagued software development practices.
The technical exploitation of this buffer overflow occurs within the connection management module of the Synology Drive Client application. When administrators interact with connection handling features, the software fails to validate the size of input data before copying it into fixed-size buffers. This allows a local attacker with administrator privileges to craft malicious input that exceeds the allocated buffer space. The overflow can occur through various unspecified vectors within the connection management interface, potentially including configuration parameters, network addresses, or authentication credentials. The vulnerability's nature suggests that the application uses unsafe string handling functions such as strcpy or sprintf without proper bounds checking, making it susceptible to memory corruption attacks.
The operational impact of this vulnerability extends beyond simple application instability. While the primary effect is the ability to crash the client application, the implications for system security are more severe than initially apparent. Local privilege escalation opportunities arise when administrators execute commands through the vulnerable interface, potentially leading to complete system compromise. The vulnerability creates a persistent threat vector that could be exploited by attackers who have already gained administrative access to the system. This type of local privilege escalation aligns with ATT&CK technique T1068 which covers local privilege escalation through application vulnerabilities. The crash capability also introduces denial of service risks that could disrupt business operations and productivity, particularly in enterprise environments where Synology Drive Client serves critical collaboration functions.
Mitigation strategies for CVE-2022-49040 should focus on immediate software updates to version 3.4.0-15721 or later, which contain the necessary patches to address the buffer overflow condition. Organizations should implement comprehensive vulnerability management procedures to ensure all instances of the Synology Drive Client are updated across their network infrastructure. Additional defensive measures include implementing least privilege access controls to limit administrator account usage and monitoring for unusual connection management activities that might indicate exploitation attempts. Network segmentation strategies should isolate systems running Synology Drive Client to limit potential lateral movement if exploitation occurs. System hardening practices such as disabling unnecessary features, implementing application whitelisting, and conducting regular security assessments of client software configurations will further reduce the attack surface. The vulnerability serves as a reminder of the critical importance of input validation and memory safety practices in software development, particularly for applications handling sensitive network connections and authentication data.