SquirrelMail Virtual Keyboard Cross-Site Scripting Scanner

The SquirrelMail Virtual Keyboard plugin is commonly used by webmail applications to provide an on-screen keyboard interface for users. This tool is widely utilized by businesses and individuals who require secure environments to compose emails on public or shared devices. The SquirrelMail software, inclusive of its plugins, is favored for its lightweight nature and ease of integration into various email server setups. Many organizations leverage SquirrelMail for its flexibility and open-source customization capabilities. It serves as an essential component in maintaining secure communication over webmail interfaces. The Virtual Keyboard plugin specifically enhances data entry security against keyloggers.

The Cross-Site Scripting (XSS) vulnerability found in the SquirrelMail Virtual Keyboard plugin enables attackers to inject malicious scripts into web pages. These scripts execute in the user's browser, resulting in unauthorized actions executed on behalf of the user. This vulnerability arises due to improper input validation where user-supplied input is not properly sanitized. Attackers exploit this vulnerability to steal session cookies, redirect users to malicious sites, or disrupt website functionalities. It poses a moderate risk by allowing unauthorized actions and potentially compromising sensitive user data. Addressing this vulnerability is crucial to maintaining the security of webmail applications utilizing this plugin.

The vulnerability exists in the vkeyboard.php parameter of the SquirrelMail Virtual Keyboard plugin. Attackers exploit this endpoint by injecting JavaScript code through unsanitized input fields. The plugin fails to correctly validate inputs against malicious script embedding, making it susceptible to XSS attacks. This technical flaw allows script code to execute in users' browsers when they access the compromised webmail interface. Consequently, attackers gain the ability to intercept user interactions and manipulate session data. Fixing this vulnerability involves enhancing the input validation mechanisms to properly filter out unauthorized script execution attempts.

If this vulnerability is exploited, attackers can execute malicious scripts to hijack user sessions and steal sensitive information. Compromised cookies may enable further unauthorized access to users' webmail accounts. The attacker can impersonate the user and perform actions on the webmail application, breaching privacy and security. The vulnerability might also serve as a pivot point for broader network attacks or data exfiltration. Users might experience incidents of unauthorized email sending or account activities initiated by the attacker. This exploitation can lead to distrust in the webmail service and potential reputational damage.

REFERENCES

• https://www.exploit-db.com/exploits/34814