PT-2021-20840 · Zimbra · Zimbra Collaboration Suite

Simon Scannell · Published 2021-07-02 · Updated 2022-04-06 · CVE-2021-35208

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: Zimbra Collaboration Suite versions 8.8.x through 8.8.15 Patch 22

Description: An issue was discovered in the Calendar Invite component, specifically in ZmMailMsgView.js. This issue allows an attacker to place HTML containing executable JavaScript inside element attributes, which becomes unescaped and causes arbitrary markup to be injected into the document.

Recommendations: For Zimbra Collaboration Suite versions 8.8.x through 8.8.15 Patch 22, update to version 8.8.15 Patch 23 or later to resolve the issue. As a temporary workaround, consider restricting the use of the Calendar Invite component until a patch is applied.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-35208

Affected Products

Zimbra Collaboration Suite

References · 8

• 🔥 https://blog.sonarsource.com/zimbra-webmail-compromise-via-email · Exploit
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories · Vendor Advisory
• https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23 · Vendor Advisory
• https://wiki.zimbra.com/wiki/Security_Center · Vendor Advisory
• https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-35208 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35208 · Security Note
• https://t.me/cvenotify/18505 · Telegram Post