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archlinuxArchLinuxASA-201801-6
HistoryJan 08, 2018 - 12:00 a.m.

[ASA-201801-6] linux-lts: access restriction bypass

2018-01-0800:00:00
security.archlinux.org
25

CVSS2

4.7

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

5.6

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.974

Percentile

99.9%

Arch Linux Security Advisory ASA-201801-6

Severity: High
Date : 2018-01-08
CVE-ID : CVE-2017-5754
Package : linux-lts
Type : access restriction bypass
Remote : No
Link : https://security.archlinux.org/AVG-577

Summary

The package linux-lts before version 4.9.75-1 is vulnerable to access
restriction bypass.

Resolution

Upgrade to 4.9.75-1.

pacman -Syu “linux-lts>=4.9.75-1”

The problem has been fixed upstream in version 4.9.75.

Workaround

None.

Description

An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions (a
commonly used performance optimization).
This variant (“Rogue Data Load”) relies on the fact that, on impacted
microprocessors, during speculative execution of instruction permission
faults, exception generation triggered by a faulting access is
suppressed until the retirement of the whole instruction block. In a
combination with the fact that memory accesses may populate the cache
even when the block is being dropped and never committed (executed), an
unprivileged local attacker could use this flaw to read memory from
arbitrary addresses, including privileged (kernel space) and all other
processes running on the system by conducting targeted cache side-
channel attacks.

Impact

A local unprivileged attacker is able to read memory from arbitrary
addresses including the kernel and all other processes running on the
system.

References

https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html
https://meltdownattack.com
https://xenbits.xen.org/xsa/advisory-254.html
http://blog.cyberus-technology.de/posts/2018-01-03-meltdown.html
https://git.kernel.org/linus/5aa90a84589282b87666f92b6c3c917c8080a9bf
https://git.kernel.org/linus/00a5ae218d57741088068799b810416ac249a9ce
https://security.archlinux.org/CVE-2017-5754

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanylinux-lts< 4.9.75-1UNKNOWN

CVSS2

4.7

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

5.6

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.974

Percentile

99.9%