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ubuntucveUbuntu.comUB:CVE-2018-13405
HistoryJul 06, 2018 - 12:00 a.m.

CVE-2018-13405

2018-07-0600:00:00
ubuntu.com
ubuntu.com
17

4.6 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

0.4%

The inode_init_owner function in fs/inode.c in the Linux kernel through
3.16 allows local users to create files with an unintended group ownership,
in a scenario where a directory is SGID to a certain group and is writable
by a user who is not a member of that group. Here, the non-member can
trigger creation of a plain file whose group ownership is that group. The
intended behavior was that the non-member can trigger creation of a
directory (but not a plain file) whose group ownership is that group. The
non-member can escalate privileges by making the plain file executable and
SGID.

Bugs

Notes

Author Note
tyhicks While inode_init_owner() has only been vulnerable since its introduction in a1bd120d13e586ea1c424048fd2c8420a442852a, this flaw has been present in individual filesystems since the beginning of the kernel git history.
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1-10 of 201

4.6 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

0.4%