vulnerability
FreeBSD: VID-A9C6E9BE-61FB-11EB-B87A-901B0EF719AB (CVE-2020-25579): FreeBSD -- Uninitialized kernel stack leaks in several file systems
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:P/I:N/A:N) | 2021-01-29 | 2021-01-30 | 2021-04-05 |
Description
Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-A9C6E9BE-61FB-11EB-B87A-901B0EF719AB:
Problem Description:
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. This problem is not present in
FreeBSD 11.
Additionally, msdosfs(5) was failing to zero-fill a pair of padding
fields in the dirent structure, resulting in a leak of three
uninitialized bytes.
Impact:
Kernel stack disclosures may leak sensitive information which could
be used to compromise the security of the system.
Solution(s)
References
Explore Exposure Command
Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.