#VU105733 Improper Preservation of Permissions in Zimbra Collaboration - CVE-2020-8633

Vulnerability identifier: #VU105733

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-8633

CWE-ID: CWE-281

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zimbra Collaboration
Web applications / Webmail solutions

Vendor: Synacor Inc.

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to incorrect revocation of a shared calendar in Outlook. A remote user can access the calendar after it was revoked.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 8.8.15

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External links
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P7

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.