Open redirect in Zimbra Collaboration - CVE-2021-34807
Published: July 28, 2021
Vulnerability identifier: #VU55397
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34807
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to improper sanitization of user-supplied data in the /preauth Servlet. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
Affected software
Zimbra Collaboration
How to mitigate CVE-2021-34807
Install updates from vendor's website.
Zimbra Collaboration - addressed in versions 8.8.15 Patch 23, 9.0.0 Patch 16