PT-2021-20662 · Zimbra · Zimbra Collaboration Suite

Simon Scannell · Published 2021-07-02 · Updated 2021-07-08 · CVE-2021-34807

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Zimbra Collaboration Suite versions prior to 9.0

Description: An open redirect issue exists in the /preauth Servlet. To exploit this, an attacker needs a valid zimbra auth token or preauth token. With the token, an attacker can redirect a user to any URL using the "isredirect=1&redirectURL=" parameter in conjunction with the token data, such as a valid "authtoken=" value.

Recommendations: For Zimbra Collaboration Suite versions prior to 9.0, update to version 9.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the /preauth Servlet to minimize the risk of exploitation. Avoid using the "isredirect=1&redirectURL=" parameter in the affected API endpoint until the issue is resolved.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2021-34807

Affected Products

Zimbra Collaboration Suite

References · 6

• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories · Vendor Advisory
• https://wiki.zimbra.com/wiki/Security_Center · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34807 · Security Note
• https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16 · Vendor Advisory
• https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34807 · Vendor Advisory