Overview CVE-2020-36880 describes a local buffer overflow vulnerability present in Flexsense DiskBoss version 7.7.14. This vulnerability resides within the ‘Reports and Data Directory’ field of the application, potentially allowing a local attacker to execute arbitrary code on the affected system. Technical Details The vulnerability stems from insufficient input validation when handling user-supplied data for the ‘Reports and Data Directory’ field. By providing an overly long string to this field, an attacker can overwrite adjacent memory regions, leading to a buffer overflow condition. Successful exploitation could grant the attacker the ability to inject and execute malicious code with the privileges of…

Overview This article details a critical security vulnerability, identified as CVE-2020-36879, affecting Flexsense DiskBoss version 11.7.28. This vulnerability allows unauthenticated attackers to elevate their privileges and execute arbitrary code with system-level privileges during startup or reboot. The root cause is an unquoted service path, which enables attackers to inject malicious commands. Technical Details The vulnerability lies in how DiskBoss’s services are configured. Specifically, the path to the service executable is not enclosed in quotes. This allows an attacker to insert malicious executables into directories along the service path. When the operating system attempts to start the service, it may inadvertently…

Overview CVE-2020-36878 details a critical unauthenticated file disclosure vulnerability affecting ReQuest Serious Play Media Player version 3.0. This flaw allows remote attackers to access sensitive files on the server due to improper validation of input passed through the ‘file’ parameter within a script. By manipulating this parameter, attackers can potentially read arbitrary web log files and other sensitive local resources. Technical Details The vulnerability stems from a lack of proper sanitization of the ‘file’ parameter within a specific script of the ReQuest Serious Play Media Player. When a request containing a crafted ‘file’ parameter is sent to the server, the…

Overview CVE-2020-36877 is a critical security vulnerability affecting ReQuest Serious Play F3 Media Server version 7.0.3. This vulnerability allows unauthenticated attackers to execute arbitrary code on the server. The root cause is the ability to upload PHP executable files through the “Quick File Uploader” page, bypassing any authentication mechanisms. This effectively grants attackers complete control over the affected system. Technical Details The vulnerability resides in the “Quick File Uploader” functionality of the ReQuest Serious Play F3 Media Server. Due to inadequate input validation and lack of authentication, an attacker can directly upload a PHP file containing malicious code. Once the…

Overview CVE-2020-36876 describes a critical vulnerability affecting multiple versions of the ReQuest Serious Play F3 Media Server. Specifically, versions 7.0.3.4968 (Pro), 7.0.2.4954, 6.5.2.4954, 6.4.2.4681, 6.3.2.4203, and 2.0.1.823 are susceptible to an unauthenticated information disclosure flaw. This flaw allows remote, unauthenticated attackers to access the webserver’s Python debug log file, potentially exposing highly sensitive system information, credentials, file paths, running processes, and command-line arguments. Technical Details The vulnerability resides in the lack of access control on the message_log page of the ReQuest Serious Play F3 Media Server. By simply navigating to this page, an attacker can download the Python debug log…

This article provides a detailed analysis of CVE-2025-66552, a medium severity security vulnerability affecting Nextcloud Server and Enterprise Server. This vulnerability allows for actions on files and folders within group folders to bypass the admin audit logging system, potentially hindering security monitoring and incident response. Overview CVE-2025-66552 was identified in Nextcloud Server and Enterprise Server versions prior to 30.0.9 and 31.0.1. The issue stems from incorrect path handling within group folders, leading to the admin_audit app failing to record certain actions. This could allow malicious actors to operate within group folders without leaving a comprehensive audit trail. Technical Details The…

Overview This article details CVE-2025-66547, a medium severity security vulnerability affecting Nextcloud Server and Enterprise Server versions prior to 31.0.1. This flaw allows non-privileged users to modify tags on files even if they lack direct access to those files, potentially leading to data integrity issues and unauthorized information disclosure. A fix is available in version 31.0.1. Technical Details The vulnerability stems from insufficient access control checks during bulk tagging operations. An unauthenticated, low-privilege user can craft requests to modify tags on files to which they would normally not have access. This occurs due to a bypass in the permissioning logic…

Overview This blog post details CVE-2025-66546, a low-severity vulnerability discovered in Nextcloud Calendar, a popular calendar application for Nextcloud. This vulnerability allowed attackers to potentially book appointments without knowing the appointment token by exploiting a sequential ID issue. Patches have been released to address this issue. Technical Details The vulnerability stemmed from the way Nextcloud Calendar handled appointment booking IDs. Prior to versions 4.7.19, 5.5.6, and 6.0.1, the application didn’t sufficiently validate appointment booking requests. An attacker could potentially predict and use sequential IDs to blindly book appointments, even without possessing the proper appointment token. This could lead to unauthorized…

Overview CVE-2025-66512 is a medium-severity vulnerability affecting Nextcloud Server and Server Enterprise. This vulnerability allows a malicious user to potentially bypass the Content Security Policy (CSP) by tricking a user into viewing a specially crafted SVG file outside of the Nextcloud Server’s web page context. This could lead to cross-site scripting (XSS) or other malicious activities. Technical Details The vulnerability stems from a missing sanitization check when handling uploaded SVG files. A malicious user can craft an SVG file containing JavaScript code or other potentially harmful content. If a user then views this SVG file in a way that bypasses…

Overview CVE-2025-66511 is a medium severity vulnerability found in Nextcloud Calendar, a popular calendar application for the Nextcloud platform. This vulnerability, affecting versions prior to 6.0.3, stems from the predictable generation of participant tokens used in meeting proposals. An attacker could potentially compute valid tokens, allowing them to gain unauthorized access to meeting details and submit dates on behalf of others. Technical Details The core issue lies in how the Calendar app generates participant tokens for meeting proposals. Instead of employing a cryptographically secure random number generator, the application utilizes a hash function that, while not explicitly stated, is likely…