Multiple vulnerabilities in Zimbra Collaboration

Published: 2023-07-26

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-0464 CVE-2023-38750
CWE-ID	CWE-400 CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Zimbra Collaboration Web applications / Webmail solutions
Vendor	Synacor Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU73960

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-0464

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when verifying X.509 certificate chains that include policy constraints. A remote attacker can create a specially crafted certificate to trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 - 10.0.1

External links

http://wiki.zimbra.com/wiki/Security_Center#ZCS_9.0.0_Patch_34_Released
http://wiki.zimbra.com/wiki/Security_Center#ZCS_8.8.15_Patch_41_Released

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Information disclosure

EUVDB-ID: #VU78672