CVE-2021-20247
High
Description
A flaw was found in mbsync before v1.3.5 and v1.4.1. Validations of the mailbox names returned by IMAP LIST/LSUB do not occur allowing a malicious or compromised server to use specially crafted mailbox names containing '..' path components to access data outside the designated mailbox on the opposite end of the synchronization channel. The highest threat from this vulnerability is to data confidentiality and integrity.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Mbsync
PublishedFeb 23, 2021
First seenFeb 23, 2021
Weakness typeCWE-20Improper input validation
How to fix
Update
- mbsync_project mbsync1.3.5, 1.4.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mbsync_project mbsync | v < 1.3.5, 1.4.0 ≤ v < 1.4.1 | 1.3.5, 1.4.1 |
| fedoraproject extra_packages_for_enterprise_linux | 8.0 | — |
| debian debian_linux | 9.0 | — |
| fedoraproject fedora | 32, 33 | — |
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