vulnerability

FreeBSD: VID-A9C6E9BE-61FB-11EB-B87A-901B0EF719AB (CVE-2020-25579): FreeBSD -- Uninitialized kernel stack leaks in several file systems

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
2021-01-29
Added
2021-01-30
Modified
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)

freebsd-upgrade-base-11_4-release-p7freebsd-upgrade-base-12_1-release-p13freebsd-upgrade-base-12_2-release-p3
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