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cve[email protected]CVE-2017-18344
HistoryJul 26, 2018 - 7:29 p.m.

CVE-2017-18344

2018-07-2619:29:00
CWE-125
[email protected]
web.nvd.nist.gov
180
cve-2017-18344
linux kernel
timer_create
out-of-bounds access
sigevent
sigev_notify
/proc/$pid/timers
kernel memory
config_posix_timers
config_checkpoint_restore
nvd

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

5.8 Medium

AI Score

Confidence

High

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

0.001 Low

EPSS

Percentile

39.7%

JSON

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn’t properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

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5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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5.8 Medium

AI Score

Confidence

High

2.1 Low

CVSS2

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LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

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0.001 Low

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39.7%

JSON
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