Vulnerability CVE-2021-20247
Published: 2021-02-23

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.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.8/10
4.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Mbsync project -> Mbsync 
Fedoraproject -> Extra packages for enterprise linux 
Fedoraproject -> Fedora 

 References:
https://bugzilla.redhat.com/show_bug.cgi?id=1928963
https://www.openwall.com/lists/oss-security/2021/02/22/1
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