CVE-2021-20247: Path Traversal
First published: Mon Feb 15 2021(Updated: )
A flaw was found in mbsync before v1.3.5 and v1.4.1. mbsync doesn't validate the mailbox names returned by IMAP LIST/LSUB, which allows a malicious/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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/mbsync | <1.35 | 1.35 |
| redhat/mbsync | <1.4.1 | 1.4.1 |
| Mbsync Project Mbsync | <1.3.5 | |
| Mbsync Project Mbsync | >=1.4.0<1.4.1 | |
| Fedoraproject Extra Packages For Enterprise Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 |
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Reference Links
- https://www.openwall.com/lists/oss-security/2021/02/22/1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1931598
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1931597
- https://bugzilla.redhat.com/show_bug.cgi?id=1928963
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/
- https://security.gentoo.org/glsa/202208-15
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/
Frequently Asked Questions
What is the vulnerability ID for this flaw?
The vulnerability ID for this flaw is CVE-2021-20247.
What is the severity rating of CVE-2021-20247?
The severity rating of CVE-2021-20247 is 7.4 (high).
What software versions are affected by this vulnerability?
mbsync versions before v1.3.5 and v1.4.1 are affected by this vulnerability.
How can a malicious server exploit this vulnerability?
A malicious server can exploit this vulnerability by using specially crafted mailbox names containing '..' path components to access data outside the designated mailbox.
Are there any references available for CVE-2021-20247?
Yes, you can find references for CVE-2021-20247 at the following links: [Reference 1](https://www.openwall.com/lists/oss-security/2021/02/22/1), [Reference 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1931598), [Reference 3](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1931597).
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