XXE in Zimbra Collaboration Suite

1) XML External Entity injection

EUVDB-ID: #VU52298

Risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]

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 - 8.7.11

CPE2.3

• cpe:2.3:a:synacor:zimbra_collaboration:8.7.0:*:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration:8.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration:8.7.2:*:*:*:*:*:*:*

External links

https://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html
https://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?

Yes. This vulnerability is being exploited in the wild.