CVE-2021-3178: Path Traversal
First published: Tue Jan 19 2021(Updated: )
** DISPUTED ** fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <=5.10.8 | |
| Fedora | =33 | |
| Debian | =9.0 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=51b2ee7d006a736a9126e8111d1f24e4fd0afaa6
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5SGB7TNDVQEOJ7NVTGX56UWHDNQM5TRC/
- https://patchwork.kernel.org/project/linux-nfs/patch/20210111210129.GA11652@fieldses.org/
- https://launchpad.net/bugs/cve/CVE-2021-3178
- https://patchwork.kernel.org/project/linux-nfs/patch/20210111210129.GA11652%40fieldses.org/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5SGB7TNDVQEOJ7NVTGX56UWHDNQM5TRC/
- https://security-tracker.debian.org/tracker/CVE-2021-3178
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3178
- https://nvd.nist.gov/vuln/detail/CVE-2021-3178
- https://ubuntu.com/security/CVE-2021-3178
Frequently Asked Questions
What is the severity of CVE-2021-3178?
CVE-2021-3178 is considered a moderate severity vulnerability that can allow remote attackers to traverse the filesystem.
How do I fix CVE-2021-3178?
To remediate CVE-2021-3178, update the Linux kernel to version 5.10.223-1, 5.10.226-1 or later.
What software is affected by CVE-2021-3178?
CVE-2021-3178 affects the Linux kernel up to version 5.10.8 and specific distributions like Fedora 33 and Debian 9.0.
Can CVE-2021-3178 be exploited remotely?
Yes, CVE-2021-3178 can be exploited remotely via the READDIRPLUS functionality in NFS exports.
Is this vulnerability still a concern if I am using a patched version?
If you are using a patched version of the Linux kernel, the concerns related to CVE-2021-3178 should be mitigated.
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