Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mbsync Project | Mbsync | < 1.3.5 |
| Fedoraproject | Extra Packages For Enterprise Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 32 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1928963Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202208-15Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/02/22/1ExploitMailing ListThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1928963Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202208-15Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/02/22/1ExploitMailing ListThird Party Advisory
FAQ
What is CVE-2021-20247?
CVE-2021-20247 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 mailbo...
How severe is CVE-2021-20247?
CVE-2021-20247 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-20247?
Check the references section above for vendor advisories and patch information. Affected products include: Mbsync Project Mbsync, Fedoraproject Extra Packages For Enterprise Linux, Debian Debian Linux, Fedoraproject Fedora.