XXE in Zimbra Collaboration Suite



Published: 2019-05-30 | Updated: 2021-04-16
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-9670
CWE ID CWE-611
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Zimbra Collaboration
Web applications / Webmail solutions

Vendor Synacor Inc.

Security Advisory

This security advisory describes one medium risk vulnerability.

1) XML External Entity injection

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-9670

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: Yes

Description

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

The vulnerability exists due to insufficient validation of user-supplied XML input within the mailboxd component. A remote attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.7.0, 8.7.1, 8.7.2, 8.7.3, 8.7.4, 8.7.5, 8.7.6, 8.7.7, 8.7.8, 8.7.9, 8.7.10, 8.7.11, 8.7.11 Patch 1, 8.7.11 Patch 2, 8.7.11 Patch 3, 8.7.11 Patch 4, 8.7.11 Patch 5, 8.7.11 Patch 6, 8.7.11 Patch 7, 8.7.11 Patch 8, 8.7.11 Patch 9

CPE External links

http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html
http://www.rapid7.com/db/modules/exploit/linux/
http/zimbra_xxe_rce
https://bugzilla.zimbra.com/show_bug.cgi?id=109129
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://www.exploit-db.com/exploits/46693/

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. However, proof of concept for this vulnerability is available.



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