Vulnerabilities Allow Hacking of Zimbra Webmail Servers With Single Email

guest · Jul 27, 2021

Vulnerabilities Allow Hacking of Zimbra Webmail Servers With Single Email
July 27, 2021
https://www.securityweek.com/vulnerabilities-allow-hacking-zimbra-webmail-servers-single-email

A 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.

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. The flaws could allow an unauthenticated attacker to compromise the webmail server of an organization and gain access to all employee email messages.
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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.
An attacker looking to exploit the issue has to include crafted JavaScript code in the email. When executed, the payload would provide the attacker with access to the victim’s emails and to their webmail session.

The second bug is CVE-2021-35209, an open redirect leading to server-side request forgery (SSRF). An attacker could chain the two vulnerabilities to extract tokens and credentials from “instances within the cloud infrastructure,” the SonarSource researcher says.
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Both vulnerabilities were patched in late June with the release of Zimbra 9.0.0 P16 and 8.8.15 P23.
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Vulnerabilities Allow Hacking of Zimbra Webmail Servers With Single Email

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