CVE-2020-25578

Description

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.

Related CPE's

ofreebsdfreebsd11.4-******
vulnerable
ofreebsdfreebsd11.4p1******
vulnerable
ofreebsdfreebsd11.4p2******
vulnerable
ofreebsdfreebsd11.4p3******
vulnerable
ofreebsdfreebsd11.4p4******
vulnerable
ofreebsdfreebsd11.4p5******
vulnerable
ofreebsdfreebsd11.4p6******
vulnerable
ofreebsdfreebsd12.1-******
vulnerable
ofreebsdfreebsd12.1p1******
vulnerable
ofreebsdfreebsd12.1p10******
vulnerable

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-21:01.fsdisclosure.asc

Vendor Advisory

CvssV3 impact

BaseSeverity

MEDIUM

ConfidentialityImpact

LOW

AttackComplexity

LOW

Scope

UNCHANGED

AttackVector

NETWORK

AvailabilityImpact

NONE

IntegrityImpact

NONE

PrivilegesRequired

NONE

BaseScore

5.3

VectorString

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Version

3.1

UserInteraction

NONE

CvssV2 impact

AccessComplexity

LOW

ConfidentialityImpact

PARTIAL

AvailabilityImpact

NONE

IntegrityImpact

NONE

BaseScore

5

VectorString

AV:N/AC:L/Au:N/C:P/I:N/A:N

Version

2.0

AccessVector

NETWORK

Authentication

NONE