CVE-2020-12846: Malicious File Upload
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.
Affected Software
Event History
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2020-12846.
What is the severity level of CVE-2020-12846?
The severity level of CVE-2020-12846 is high with a value of 8.
Which software versions are affected by CVE-2020-12846?
Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 are affected by CVE-2020-12846.
How can an attacker exploit CVE-2020-12846?
An attacker can exploit CVE-2020-12846 by uploading executable files (exe, sh, bat, jar) as an avatar image in the Contact section of the mailbox.
How can I fix CVE-2020-12846?
To fix CVE-2020-12846, update Zimbra to version 8.8.15 Patch 10 or 9.x Patch 3 or later.