CVE-2021-35211 Scanner

SolarWinds Serv-U FTP is a widely used file transfer solution utilized by businesses and organizations for secure file sharing and management. It is designed to handle file transfers across networks using a user-friendly interface and robust security features. Catering to enterprises, it supports various protocols and multiple user configurations to streamline IT processes. The software is employed by IT departments to manage large-scale file transfers securely and efficiently. Its flexibility and scalability make it suitable for organizations handling sensitive data. With a focus on security, it offers encrypted data transfer options and role-based access controls.

The Remote Code Execution vulnerability in SolarWinds Serv-U FTP allows attackers to execute arbitrary code on vulnerable systems. This vulnerability stems from a remote memory escape that can be triggered by crafted memory operations. The flaw exists in versions of the software before 15.2.3 HF2 and poses a critical risk, granting privilege escalation capabilities. Attackers exploiting this vulnerability can gain unauthorized high-level access to the system. It involves manipulating memory operations remotely to escape confinement, leading to code execution. This heightened level of control can compromise the entire system, making immediate remediation essential.

The vulnerability details point to a critical flaw where a remote attacker can send crafted memory operations to the Serv-U FTP server. Upon execution, these operations can escape normal memory confinement and result in arbitrary code execution. The vulnerability affects specific endpoints within the software handling memory operations directly. Attack vectors include sending specially crafted packets that exploit this memory mismanagement. As the vulnerability is tied to memory handling, it notably impacts systems before version 15.2.3 HF2. Administrators are advised to upgrade promptly to secure their systems and mitigate potential risks.

When exploited, this vulnerability can have severe consequences for affected systems, including unauthorized access by attackers with elevated privileges. Such access can lead to complete system compromise, allowing malicious actors to manipulate system settings, access sensitive data, and disrupt normal operations. Additionally, the vulnerability might be used to deploy malware, monitor or intercept data transfers, and create backdoors for future infiltration. Compromised systems may serve as launch points for further attacks within a network, amplifying the potential damage.

REFERENCES

• https://github.com/BishopFox/CVE-2021-35211
• https://www.rapid7.com/db/vulnerabilities/solarwinds-serv-u-cve-2021-35211/
• https://www.microsoft.com/en-us/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit/