Vulnerability Details : CVE-2021-20247
Potential exploit
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.
Vulnerability category: Directory traversalInput validation
Products affected by CVE-2021-20247
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:mbsync_project:mbsync:*:*:*:*:*:*:*:*
- cpe:2.3:a:mbsync_project:mbsync:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-20247
0.47%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 62 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20247
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:N |
8.6
|
4.9
|
NIST | |
|
7.4
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
2.2
|
5.2
|
NIST |
CWE ids for CVE-2021-20247
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: secalert@redhat.com (Secondary)
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2021-20247
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/
[SECURITY] Fedora 33 Update: isync-1.4.1-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://security.gentoo.org/glsa/202208-15
isync: Multiple Vulnerabilities (GLSA 202208-15) — Gentoo securityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/
[SECURITY] Fedora 32 Update: isync-1.4.1-1.fc32 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html
[SECURITY] [DLA 3066-1] isync security updateMailing List;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1928963
1928963 – (CVE-2021-20247) CVE-2021-20247 isync/mbsync: mailbox names returned by IMAP LIST/LSUB not validatedIssue Tracking;Third Party Advisory
-
https://www.openwall.com/lists/oss-security/2021/02/22/1
oss-security - CVE-2021-20247: isync/mbsync data leak/destruction vulnerabilityExploit;Mailing List;Third Party Advisory
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