CVE-2021-43459 in Mail Server
Summary
by MITRE • 04/04/2022
A Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the (1) domain and (2) path parameters.
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Analysis
by VulDB Data Team • 04/06/2022
The vulnerability identified as CVE-2021-43459 represents a critical cross site scripting flaw within the Rumble Mail Server version 0.51.3135. This security weakness allows malicious actors to inject arbitrary JavaScript code into the application's response through specifically crafted inputs. The vulnerability manifests in two distinct parameter vectors namely the domain and path parameters, which suggests that the server fails to properly sanitize or escape user-supplied data before incorporating it into dynamic web responses. The affected software operates as an email server implementation that likely serves web-based administrative interfaces or webmail functionality, making it susceptible to exploitation by attackers who can manipulate these parameters to execute malicious scripts in the context of a victim's browser session.
The technical nature of this vulnerability aligns with CWE-79 which defines cross site scripting as the improper handling of input data that allows attackers to inject client-side scripts into web applications. The flaw occurs when the Rumble Mail Server processes the domain and path parameters without adequate validation or sanitization mechanisms, enabling attackers to inject malicious payloads that execute in the victim's browser when the affected web pages are rendered. This type of vulnerability typically arises from insufficient output encoding or improper input validation practices within the web application's codebase, where user-controllable data flows directly into HTML output without proper escaping or context-appropriate sanitization.
The operational impact of this vulnerability is significant as it provides attackers with the ability to perform session hijacking, deface web interfaces, steal sensitive cookies, or redirect users to malicious sites. An attacker could exploit this weakness to gain unauthorized access to email accounts, modify server configurations, or compromise the integrity of the email server's web interface. The vulnerability affects the server's administrative and user-facing components, potentially allowing unauthorized users to manipulate the application's behavior and access restricted functionalities. Given that email servers often contain sensitive organizational data, this XSS vulnerability could lead to data breaches, unauthorized access to communication channels, and potential escalation to more severe attacks within the network infrastructure.
Mitigation strategies for CVE-2021-43459 should focus on implementing proper input validation and output encoding mechanisms throughout the Rumble Mail Server's web application components. The recommended approach includes sanitizing all user-supplied input parameters, particularly the domain and path parameters, through strict validation and encoding before processing or rendering any web content. Organizations should apply the latest security patches provided by the software vendor, as this vulnerability likely represents a known issue that has been addressed in subsequent releases. Additionally, implementing content security policies, using secure coding practices, and conducting regular security assessments can help prevent similar vulnerabilities from occurring in the future. The ATT&CK framework categorizes this vulnerability under T1212 Exploitation for Credential Access, highlighting the potential for attackers to leverage XSS flaws to obtain unauthorized access to user credentials and sensitive information.