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ubuntucveUbuntu.comUB:CVE-2017-15131
HistoryJan 09, 2018 - 12:00 a.m.

CVE-2017-15131

2018-01-0900:00:00
ubuntu.com
ubuntu.com
11

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

0.0004 Low

EPSS

Percentile

5.1%

JSON

It was found that system umask policy is not being honored when creating
XDG user directories, since Xsession sources xdg-user-dirs.sh before
setting umask policy. This only affects xdg-user-dirs before 0.15.5 as
shipped with Red Hat Enterprise Linux.

Notes

Author Note
seth-arnold This feels like a fundamental misunderstanding of Unix model to assume that every task run on behalf of a user will be started as a child process of bash or sh run as an interactive or login shell. Environments that want a specific umask set for users should use the pam_umask(8) module as part of the login process. Environments that need a specific umask set for compliance reasons should investigate the feasibility of preparing a single-purpose LSM or seccomp jail interface of some sort.
rodrigo-zaiden pam_umask is being used to set umask when an interactive session is started, so Ubuntu is not affected by this CVE.
OSVersionArchitecturePackageVersionFilename
ubuntu22.04noarchxdg-user-dirs< anyUNKNOWN

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

0.0004 Low

EPSS

Percentile

5.1%

JSON
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