Zimbra desktop display header software#

Zimbra sanitizes HTML content in incoming emails on the server side, using the OWASP Java-HTML-Sanitizer, which is the correct approach. Once the targeted user opens the malicious email, the JavaScript payload is triggered and it can interact with the Zimbra web interface in order to exploit the second flaw automatically in the background, without any further user interaction. SonarSource told SecurityWeek that a single email sent by the attacker to a user within the targeted organization is enough to exploit the two vulnerabilities. An attacker could chain the two vulnerabilities to extract tokens and credentials from “instances within the cloud infrastructure,” the SonarSource researcher says.

The second bug is CVE-2021-35209, an open redirect leading to server-side request forgery (SSRF). When executed, the payload would provide the attacker with access to the victim’s emails and to their webmail session. Tracked as CVE-2021-35208, the first of the vulnerabilities is a DOM-based stored cross-site scripting (XSS) bug that an attacker could trigger when the victim views an incoming email.Īn attacker looking to exploit the issue has to include crafted JavaScript code in the email. The flaws could allow an unauthenticated attacker to compromise the webmail server of an organization and gain access to all employee email messages. In June, Zimbra released patches for multiple security issues in the webmail solution, including two bugs identified by Simon Scannell, a security researcher with SonarSource.

Zimbra desktop display header software#

Vulnerabilities in the Zimbra enterprise webmail solution could allow an attacker to gain unrestricted access to an organization’s sent and received email messages, software security firm SonarSource reveals.Ī webmail solution popular among enterprises worldwide, Zimbra claims to have more than 200,000 business customers, including over 1,000 government and financial institutions and roughly 500 service providers.