Path Traversal in Mbsync Project
CVE-2021-20247
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 class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.019 (78.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Mbsync Project
- Debian Linux — versions 9.0
- Fedoraproject Extra Packages For Enterprise Linux — versions 8.0
- Fedoraproject Fedora — versions 32, 33
- Isync/mbsync — versions before 1.35, before 1.4.1
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.openwall.com/lists/oss-security/2021/02/22/1 (Exploit, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2022/07/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202208-15 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20247?
- CVE-2021-20247 is a high-severity vulnerability in Mbsync Project, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2021-02-23.
- How severe is CVE-2021-20247?
- High severity. CVSS v3 base score is 7.4 out of 10.