CVE-2007-5252 in Netsupport Manager Client
Summary
by MITRE
Buffer overflow in NetSupport Manager (NSM) Client 10.00 and 10.20, and NetSupport School Student (NSS) 9.00, allows remote NSM servers to cause a denial of service or possibly execute arbitrary code via crafted data in the configuration exchange phase of an initial connection setup. NOTE: a vendor statement, which is too vague to be sure that it is for this particular issue, says that only a denial of service is possible.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/27/2019
The vulnerability identified as CVE-2007-5252 represents a critical buffer overflow flaw affecting NetSupport Manager Client versions 10.00 and 10.20, as well as NetSupport School Student version 9.00. This security weakness manifests during the initial connection setup phase when configuration data is exchanged between client and server components, creating an exploitable condition that could potentially allow remote attackers to execute arbitrary code or induce denial of service conditions. The flaw resides in the improper handling of input data during the authentication and configuration exchange process, where the software fails to validate the length of incoming data structures before copying them into fixed-size buffers. This classic buffer overflow vulnerability operates under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions that occur when data is copied into a buffer without proper bounds checking, leading to memory corruption.
The technical exploitation of this vulnerability requires an attacker to establish a connection to a vulnerable NetSupport Manager server and manipulate the configuration data exchange process to trigger the buffer overflow condition. During the initial connection phase, the client and server engage in a configuration exchange where various parameters are transmitted to establish communication parameters and authentication settings. When the client receives malformed data that exceeds the allocated buffer space, the excess data overflows into adjacent memory regions, potentially overwriting critical program execution data such as return addresses or function pointers. This memory corruption can result in unpredictable program behavior, including application crashes that manifest as denial of service conditions, or in more severe cases, allow attackers to inject and execute malicious code within the context of the running application. The vulnerability specifically targets the client-side components, making it particularly dangerous as it can be exploited without requiring authentication to the target system, leveraging the inherent trust relationship between client and server during connection establishment.
The operational impact of CVE-2007-5252 extends beyond simple denial of service scenarios to potentially enable remote code execution, making it a significant threat to enterprise environments that rely on NetSupport management solutions for remote desktop and network administration. Organizations utilizing these vulnerable versions of NetSupport Manager or NetSupport School Student face potential compromise of their remote management infrastructure, as successful exploitation could allow attackers to gain unauthorized access to managed systems, execute arbitrary commands, and potentially escalate privileges within the network. The vulnerability's exploitation requires minimal privileges and can be automated, making it particularly attractive to threat actors seeking to establish persistent access to target networks. Network administrators must consider that the attack vector operates at the application layer, meaning that traditional network firewalls and intrusion detection systems may not effectively prevent exploitation, as the attack occurs during legitimate connection establishment processes. The vulnerability also impacts the availability of critical management services, potentially disrupting remote support operations and system maintenance activities that organizations depend upon for their IT infrastructure management.
Mitigation strategies for CVE-2007-5252 should prioritize immediate patch deployment from NetSupport, as the vendor has acknowledged the vulnerability and provided security updates to address the buffer overflow condition. Organizations should implement network segmentation to limit access to vulnerable NetSupport services, particularly restricting direct internet access to management servers and implementing strict access controls for remote management connections. Network monitoring should be enhanced to detect unusual patterns in configuration exchange data that might indicate exploitation attempts, with security information and event management systems configured to alert on malformed connection attempts. Additionally, administrators should consider disabling unnecessary features and services, particularly those that expose the vulnerable components to untrusted networks. The implementation of application whitelisting policies can help prevent exploitation by ensuring that only authorized versions of the NetSupport software can execute on managed systems. Security teams should also conduct comprehensive vulnerability assessments to identify all instances of vulnerable software across their network infrastructure and establish incident response procedures specifically tailored to address potential exploitation of this vulnerability. The remediation process must include thorough testing of patches in controlled environments before widespread deployment to ensure compatibility with existing network management workflows and prevent unintended service disruptions.