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CVE-2015-5252

Published: 16 December 2015

vfs.c in smbd in Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3, when share names with certain substring relationships exist, allows remote attackers to bypass intended file-access restrictions via a symlink that points outside of a share.

Notes

AuthorNote
mdeslaur
says 3.0.0 to 4.3.2
3.6 patch in upstream bug
original patch introduced a regression, see usn-2855-2

Priority

Medium

Cvss 3 Severity Score

7.2

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
precise
Released (2:3.6.3-2ubuntu2.13)
trusty
Released (2:4.1.6+dfsg-1ubuntu2.14.04.11)
upstream
Released (4.3.3,4.2.7,4.1.22)
vivid
Released (2:4.1.13+dfsg-4ubuntu3.1)
wily
Released (2:4.1.17+dfsg-4ubuntu3.1)
xenial
Released (2:4.3.3+dfsg-1ubuntu1)
yakkety
Released (2:4.3.3+dfsg-1ubuntu1)
zesty
Released (2:4.3.3+dfsg-1ubuntu1)
Patches:
upstream: https://git.samba.org/?p=samba.git;a=commit;h=f0cb216f6385460d4d3c728257baaaa26a95c5d1 (4.1)
samba4
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream
Released (4.3.3,4.2.7,4.1.22)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

Severity score breakdown

Parameter Value
Base score 7.2
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Changed
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N