Arbitrary file upload in Synacor Zimbra Collaboration Suite
CVE-2020-12846
Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 allows remote code execution via an avatar file. There is potential abuse of /service/upload servlet in the webmail subsystem. A user can upload executable files (exe,sh,bat,jar) in the Contact section of the mailbox as an avatar image for a contact. A user will receive a "Corrupt File" error, but the file is still uploaded and stored locally in /opt/zimbra/data/tmp/upload/, leaving it open to possible remote execution.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.026 (84.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000
Affected products
- Synacor Zimbra Collaboration Suite — versions 8.8.15, 9.0.0
Weakness classification (CWE)
References
- wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
- wiki.zimbra.com/wiki/Security_Center (Release Notes, Vendor Advisory)
- wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3 (Vendor Advisory)
Frequently asked questions
- What is CVE-2020-12846?
- CVE-2020-12846 is a high-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.0/10. Published 2020-06-03.
- How severe is CVE-2020-12846?
- High severity. CVSS v3 base score is 8.0 out of 10.