CVE-2021-20316: Race Condition
First published: Fri Oct 01 2021(Updated: )
A flaw was found in the way Samba handled file/directory metadata. This flaw allows an authenticated attacker with permissions to read or modify share metadata, to perform this operation outside of the share.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Samba Samba | <4.15.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Redhat Virtualization Host | =4.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux Aus | =8.6 | |
| Redhat Enterprise Linux Eus | =8.6 | |
| Redhat Enterprise Linux Tus | =8.6 | |
| redhat/samba | <4.15.0 | 4.15.0 |
| redhat/samba | <0:4.15.5-5.el8 | 0:4.15.5-5.el8 |
| redhat/samba | <0:4.15.5-100.el8 | 0:4.15.5-100.el8 |
| debian/samba | <=2:4.9.5+dfsg-5+deb10u3<=2:4.9.5+dfsg-5+deb10u4<=2:4.13.13+dfsg-1~deb11u5 | 2:4.17.11+dfsg-0+deb12u1 2:4.17.12+dfsg-0+deb12u1 2:4.19.1+dfsg-4 2:4.19.2+dfsg-1 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-20316
- https://bugzilla.redhat.com/show_bug.cgi?id=2009673
- https://bugzilla.samba.org/show_bug.cgi?id=14842
- https://security-tracker.debian.org/tracker/CVE-2021-20316
- https://security.gentoo.org/glsa/202309-06
- https://www.samba.org/samba/security/CVE-2021-20316.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2039034
- https://access.redhat.com/errata/RHSA-2022:1756
- https://access.redhat.com/errata/RHSA-2022:2074
- https://access.redhat.com/security/cve/cve-2021-20316
- https://www.cve.org/CVERecord?id=CVE-2021-20316 https://nvd.nist.gov/vuln/detail/CVE-2021-20316 https://www.samba.org/samba/security/CVE-2021-20316.html
Frequently Asked Questions
What is CVE-2021-20316?
CVE-2021-20316 is a vulnerability in Samba that allows an authenticated attacker to perform operations outside of a shared directory.
How severe is CVE-2021-20316?
CVE-2021-20316 has a severity score of 6.8, which is considered medium.
Which software is affected by CVE-2021-20316?
Samba versions up to 4.15.0, Debian Linux 10.0 and 11.0, Redhat Virtualization Host 4.0, Redhat Enterprise Linux 8.0, 8.6, and samba package versions up to 2:4.13.13+dfsg-1~deb11u5 are affected by CVE-2021-20316.
How can I fix CVE-2021-20316?
To fix CVE-2021-20316, update to Samba version 4.15.0 or later, Debian Linux 10.0 or 11.0, Redhat Virtualization Host 4.0, or Redhat Enterprise Linux 8.0 or 8.6, and update the samba package to 2:4.17.9+dfsg-0+deb12u3, 2:4.17.10+dfsg-0+deb12u1, or 2:4.19.0+dfsg-1.
Where can I find more information about CVE-2021-20316?
You can find more information about CVE-2021-20316 on the Red Hat Security Advisory and Samba bugzilla pages: https://access.redhat.com/security/cve/CVE-2021-20316, https://bugzilla.redhat.com/show_bug.cgi?id=2009673, https://bugzilla.samba.org/show_bug.cgi?id=14842.
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