CVE-2020-35730 : What You Need to Know
Learn about CVE-2020-35730, an XSS vulnerability in Roundcube Webmail versions before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. Find out the impact, affected systems, exploitation method, and mitigation steps.
An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.
Understanding CVE-2020-35730
This CVE relates to a cross-site scripting (XSS) vulnerability found in specific versions of Roundcube Webmail.
What is CVE-2020-35730?
CVE-2020-35730 is an XSS vulnerability affecting Roundcube Webmail versions prior to 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. It allows an attacker to exploit a flaw in handling JavaScript within email messages.
The Impact of CVE-2020-35730
This vulnerability could be exploited by an attacker to execute malicious scripts within the context of a user's webmail session, potentially leading to unauthorized actions or data theft.
Technical Details of CVE-2020-35730
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The issue arises from the mishandling of JavaScript in a link reference element by the 'linkref_addindex' function in 'rcube_string_replacer.php'.
Affected Systems and Versions
- Roundcube Webmail versions before 1.2.13
- Roundcube Webmail 1.3.x before 1.3.16
- Roundcube Webmail 1.4.x before 1.4.10
Exploitation Mechanism
The attacker can send a plain text e-mail message containing JavaScript in a link reference element, exploiting the vulnerability in the 'rcube_string_replacer.php' script.
Mitigation and Prevention
Protecting systems from CVE-2020-35730 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Roundcube Webmail to version 1.2.13, 1.3.16, or 1.4.10, where the vulnerability is patched.
- Educate users about the risks of clicking on links or opening attachments from unknown or suspicious sources.
Long-Term Security Practices
- Regularly monitor and update webmail software to the latest secure versions.
- Implement content security policies to mitigate XSS attacks.
Patching and Updates
- Apply security patches provided by Roundcube Webmail promptly to address known vulnerabilities and enhance system security.