A stored XSS flaw in RainLoop allows stealing users’ emails

Experts disclose an unpatched vulnerability in the RainLoop webmail client, tracked as CVE-2022-29360, that can be exploited to steal users’ emails.

RainLoop is an open-source web-based email client used by thousands of organizations, which is affected by a vulnerability, tracked as CVE-2022-29360, that can be exploited to steal users’ emails.

The vulnerability is a stored cross-site scripting (XSS) issue that impacts RainLoop version 1.16.0, which is the latest version of the software, using default configurations.

An attacker can simply trigger the vulnerability by sending a specially crafted email to a RainLoop user. Upon opening the email, a hidden JavaScript payload is executed in the browser. An attacker only needs to know the email address of an employee of a targeted organization to hijack a user’s session and steal their emails

“The code vulnerability described in this blog post can be easily exploited by an attacker by sending a malicious email to a victim that uses RainLoop as a mail client. When the email is viewed by the victim, the attacker gains full control over the session of the victim and can steal any of their emails, including those that contain highly sensitive information such as passwords, documents, and password reset links.” reads the post published by Sonar.

The vulnerability is due to a logic bug after the sanitization process, Sonar experts have found similar issues in high-profile targets such as Zimbra and WordPress.

Sonar initially reported the flaw to RainLoop in November 2021, but the company has yet to receive a response from the development team.

The researchers recommend the RainLoop fork SnappyMail which is not affected by the vulnerability.

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Pierluigi Paganini

(SecurityAffairs – hacking, RainLoop)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.