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CVE-2022-41352

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 95.5%
  1. Published26 Sept 2022
  2. Added to CISA KEV20 Oct 2022
  3. Remediation due10 Nov 2022
Actively exploited (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to upload arbitrary files using cpio package to gain incorrect access to any other user accounts.

Added to KEV: 20 Oct 2022Federal remediation due: 10 Nov 2022Used in ransomware

Description

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0. An attacker can upload arbitrary files through amavis via a cpio loophole (extraction to /opt/zimbra/jetty/webapps/zimbra/public) that can lead to incorrect access to any other user accounts. Zimbra recommends pax over cpio. Also, pax is in the prerequisites of Zimbra on Ubuntu; however, pax is no longer part of a default Red Hat installation after RHEL 6 (or CentOS 6). Once pax is installed, amavis automatically prefers it over cpio.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Synacor Zimbra Collaboration Suite8.8.15 · 9.0.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2022-41352 being actively exploited?

Yes. CVE-2022-41352 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 20 Oct 2022. It has been used in ransomware campaigns.

How severe is CVE-2022-41352?

CVE-2022-41352 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 95.5% probability of exploitation.

Which products are affected by CVE-2022-41352?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2022-41352?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-41352 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.