CVE-2020-25578
First published: Fri Mar 26 2021(Updated: )
In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 several file systems were not properly initializing the d_off field of the dirent structures returned by VOP_READDIR. In particular, tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result, eight uninitialized kernel stack bytes may be leaked to userspace by these file systems.
Credit: secteam@freebsd.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD FreeBSD | =11.4 | |
| FreeBSD FreeBSD | =11.4-p1 | |
| FreeBSD FreeBSD | =11.4-p2 | |
| FreeBSD FreeBSD | =11.4-p3 | |
| FreeBSD FreeBSD | =11.4-p4 | |
| FreeBSD FreeBSD | =11.4-p5 | |
| FreeBSD FreeBSD | =11.4-p6 | |
| FreeBSD FreeBSD | =12.1 | |
| FreeBSD FreeBSD | =12.1-p1 | |
| FreeBSD FreeBSD | =12.1-p10 | |
| FreeBSD FreeBSD | =12.1-p11 | |
| FreeBSD FreeBSD | =12.1-p12 | |
| FreeBSD FreeBSD | =12.1-p2 | |
| FreeBSD FreeBSD | =12.1-p3 | |
| FreeBSD FreeBSD | =12.1-p4 | |
| FreeBSD FreeBSD | =12.1-p5 | |
| FreeBSD FreeBSD | =12.1-p6 | |
| FreeBSD FreeBSD | =12.1-p7 | |
| FreeBSD FreeBSD | =12.1-p8 | |
| FreeBSD FreeBSD | =12.1-p9 | |
| FreeBSD FreeBSD | =12.2 | |
| FreeBSD FreeBSD | =12.2-p1 | |
| FreeBSD FreeBSD | =12.2-p2 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-25578?
CVE-2020-25578 is a vulnerability in FreeBSD that affects several file systems and could lead to improper initialization of dirent structures.
How does CVE-2020-25578 impact FreeBSD?
CVE-2020-25578 can impact FreeBSD versions 11.4, 12.1, and 12.2, causing the d_off field of dirent structures to be improperly initialized in certain file systems.
What is the severity of CVE-2020-25578?
CVE-2020-25578 has a severity rating of 5.3, which is considered medium.
How can I fix CVE-2020-25578 in FreeBSD?
To fix CVE-2020-25578, it is recommended to update to the appropriate patched version of FreeBSD, such as 11.4-p7, 12.1-p13, or 12.2-p3, depending on the affected version.
Where can I find more information about CVE-2020-25578?
You can find more information about CVE-2020-25578 in the FreeBSD Security Advisory FreeBSD-SA-21:01.fsdisclosure.asc and the NetApp advisory ntap-20210423-0002.
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