Vulnerability identifier: #VU76649

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-29381

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zimbra Collaboration
Web applications / Webmail solutions

Vendor: Synacor Inc.

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in 2FA validation process. A remote attacker can bypass 2FA authentication and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8 - 10.0.0

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External links
http://wiki.zimbra.com/wiki/Security_Center#ZCS_8.8.15_Patch_40_Released
http://wiki.zimbra.com/wiki/Security_Center#ZCS_9.0.0_Patch_33_Released
http://wiki.zimbra.com/wiki/Security_Center#Daffodil_10.0.1_Released

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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.