CVE-2023-39121 Scanner

Emlog is a popular blog and content management system used by bloggers and web developers to create and manage blogs and websites. It is widely adopted due to its user-friendly interface and robust functionality, allowing users to easily customize their websites. Emlog offers various features like plugin integration, template management, and content organization, making it versatile for different web projects. It is commonly used by individuals and small to medium-sized businesses looking to establish an online presence without extensive technical knowledge. Emlog's open-source nature allows developers to contribute and enhance its features, expanding its capabilities for the community. However, like any software, it requires regular updates to maintain security and performance.

SQL Injection is a code injection technique that might destroy the database of an application. In this vulnerability, an attacker is capable of inserting or "injecting" SQL code via unsanitized input fields, which can then be executed by the web application's database server. This type of vulnerability can allow attackers to manipulate database query logic to disclose unauthorized data or execute arbitrary SQL commands. The vulnerability found in Emlog v2.1.9 exploits the data backup/restore functionality, which lacks proper input validation and sanitization. As a result, attackers with admin credentials can inject malicious SQL code through crafted backup files.

The vulnerability arises in the data backup/restore functionality of Emlog, where user input is not sufficiently sanitized. The vulnerable endpoint is located at '/admin/data.php?action=import', where an attacker can upload a specially crafted SQL file. The parameter 'token' is utilized, which is extracted from a previous request, allowing chaining of requests to bypass authentication. Maliciously crafted SQL commands embedded in the file can be executed, leading to unintended actions. Attackers can exploit this vector by embedding commands like 'INSERT', which can add unauthorized entries to sensitive tables in the database.

When exploited, this vulnerability may allow malicious actors to gain unauthorized access to sensitive information, disrupt service operations, or escalate privileges within the Emlog application. Such manipulation could lead to data leakage, backup alteration, and the deletion or modification of critical data stored in the database. Furthermore, compromised database integrity could be used as a stepping stone to further attack vectors within the application. Overall, exploiting this vulnerability can result in significant security breaches, affecting the confidentiality, integrity, and availability of the web application and its data.

REFERENCES

• https://nvd.nist.gov/vuln/detail/CVE-2023-39121
• https://github.com/safe-b/CVE/issues/1#issue-1817133689