Multiple vulnerabilities in Zimbra Collaboration

Published: 2022-08-08 | Updated: 2023-12-19

Risk	Critical
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2021-40438 CVE-2021-39275 CVE-2021-21702 CVE-2022-27925 CVE-2022-22965 CVE-2022-27926
CWE-ID	CWE-918 CWE-119 CWE-476 CWE-22 CWE-94 CWE-79
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild. Vulnerability #4 is being exploited in the wild. Vulnerability #5 is being exploited in the wild. Vulnerability #6 is being exploited in the wild.
Vulnerable software	Zimbra Collaboration Web applications / Webmail solutions
Vendor	Synacor Inc.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU56678

Risk: High

CVSSv3.1: 8.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-40438

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: Yes

Description

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input within the mod_proxy module in Apache HTTP Server. A remote attacker can send a specially crafted HTTP request with a chosen uri-path and trick the web server to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 9.0.0

CPE2.3

External links

http://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P31
http://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24

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.

2) Buffer overflow

EUVDB-ID: #VU56679

Risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39275

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system or perform a denial of service attack.

The vulnerability exists due to a boundary error within the ap_escape_quotes() function. A remote attacker can send a specially crafted request to the web server, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the Apache module passes untrusted data to the affected function.

According to vendor, No included modules pass untrusted data to these functions

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 9.0.0

CPE2.3

External links

http://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P31
http://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24

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.

3) NULL pointer dereference

EUVDB-ID: #VU50403

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-2021-21702

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error within the SoapClient in PHP. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 9.0.0

CPE2.3

External links

http://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P31
http://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24

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.

4) Path traversal

EUVDB-ID: #VU66173

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2022-27925

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: Yes

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in file name inside a zip archive in mboximport (MailboxImportServlet). A remote user can upload a specially crafted archive and write files to an arbitrary location on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 9.0.0

CPE2.3

External links

http://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P31
http://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24

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?

Yes. This vulnerability is being exploited in the wild.

5) Code Injection

EUVDB-ID: #VU61756

Risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2022-22965

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted HTTP request to the affected application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

This vulnerability was dubbed "Spring4Shell".

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 9.0.0

CPE2.3

External links

http://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P31
http://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24

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.

6) Cross-site scripting

EUVDB-ID: #VU66174

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2022-27926

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. The vulnerability allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 9.0.0 Patch 1 - 9.0.0

CPE2.3

External links

http://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24

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.