CVE-2021-20247
high
CVSS v3
—
CVSS v2
—
VIR risk
8.0
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.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-20247
Vendor advisory: arch — https://security.archlinux.org/ASA-202102-38
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 1.3.5-1 | |
| debian | bookworm | fixed | 1.3.0-2.1 |
| debian | bullseye | fixed | 1.3.0-2.1 |
| debian | forky | fixed | 1.3.0-2.1 |
| debian | sid | fixed | 1.3.0-2.1 |
| debian | trixie | fixed | 1.3.0-2.1 |
References
Verify integrity in audit chain (admin only). AS-IS.