CVE-2022-2653 in Planka
Summary
by MITRE • 08/04/2022
With this vulnerability an attacker can read many sensitive files like configuration files, or the /proc/self/environ file, that contains the environment variable used by the web server that includes database credentials. If the web server user is root, an attacker will be able to read any file in the system.
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Analysis
by VulDB Data Team • 08/30/2022
This vulnerability represents a critical information disclosure flaw that allows attackers to access sensitive system files through improper input validation or access control mechanisms. The vulnerability specifically enables unauthorized reading of configuration files and the /proc/self/environ file which contains critical environment variables including database credentials. This represents a severe privilege escalation risk when the web server operates with root privileges, as it effectively grants full system access to any attacker who can exploit this flaw. The underlying technical issue typically stems from insufficient input sanitization or improper file access controls that allow path traversal or direct file access attacks. Such vulnerabilities fall under the CWE-22 category for Improper Limitation of a Pathname to a Restricted Directory and are closely related to CWE-77 and CWE-78 which address command injection and path traversal respectively. From an operational perspective, this vulnerability creates a pathway for attackers to escalate privileges and gain complete system compromise, as the ability to read /proc/self/environ provides access to environment variables that often contain database connection strings, API keys, and other sensitive credentials. The attack surface is particularly dangerous when the web server process runs with elevated privileges, as it effectively removes the operating system's file permission controls. This vulnerability aligns with ATT&CK technique T1005 for Data from Local System and T1078 for Valid Accounts, as it leverages legitimate system access to extract sensitive information. The impact extends beyond simple information disclosure, as database credentials obtained through this method can enable attackers to directly access and manipulate backend databases, potentially leading to data breaches, unauthorized transactions, and complete system compromise.
The vulnerability exploitation typically occurs through path traversal attacks or improper file access controls that allow attackers to navigate to restricted directories and read sensitive files. When the web server process executes with root privileges, the attacker gains the ability to read any file on the system, effectively bypassing all standard file permission controls. This creates a particularly dangerous scenario where a single vulnerability can provide complete system access, making it a high-priority target for exploitation. The technical flaw often involves insufficient validation of user-supplied input that is used to construct file paths or access system resources, allowing attackers to manipulate these inputs to access restricted files. This type of vulnerability is commonly found in web applications that fail to properly sanitize file access requests or implement inadequate access controls for system resources. Security practitioners should note that this vulnerability type often requires immediate patching due to its potential for privilege escalation and complete system compromise. The remediation approach involves implementing proper input validation, restricting file access permissions, and ensuring that web server processes run with minimal required privileges rather than root access. Additionally, implementing proper access control lists and monitoring for unauthorized file access attempts can help detect and prevent exploitation of similar vulnerabilities.
The operational impact of this vulnerability extends far beyond simple data exposure, as it provides attackers with the ability to escalate privileges and gain complete system control. When database credentials are exposed through environment variables, attackers can directly access backend databases without requiring additional authentication, leading to potential data breaches and unauthorized data manipulation. The vulnerability's severity is amplified when the web server runs with root privileges, as it removes all standard file system access controls and allows full system enumeration. This type of vulnerability is particularly concerning in environments where web applications have broad system access or where privilege separation is not properly implemented. The exploitation process typically involves crafting specific input that bypasses normal access controls and allows file system traversal to sensitive locations. Organizations should implement comprehensive monitoring solutions to detect unauthorized file access patterns and establish proper privilege separation practices to limit the potential impact of such vulnerabilities. Regular security assessments and input validation testing should be performed to identify and remediate similar access control flaws before they can be exploited by malicious actors. The vulnerability demonstrates the critical importance of principle of least privilege and proper access control implementation in preventing privilege escalation attacks that can lead to complete system compromise.