CVE-2017-2624

2017-03-0100:00:00

ubuntu.com

1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

7 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.002 Low

EPSS

Percentile

52.0%

JSON

It was found that xorg-x11-server before 1.19.0 including uses memcmp() to
check the received MIT cookie against a series of valid cookies. If the
cookie is correct, it is allowed to attach to the Xorg session. Since most
memcmp() implementations return after an invalid byte is seen, this causes
a time difference between a valid and invalid byte, which could allow an
efficient brute force attack.

Bugs

<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=856398>

Notes

Author	Note
tyhicks	1.19.0 and lower are affected

OSVersionArchitecturePackageVersionFilename
ubuntu14.04noarchxorg-server< 2:1.15.1-0ubuntu2.9UNKNOWN
ubuntu16.04noarchxorg-server< 2:1.18.4-0ubuntu0.3UNKNOWN
ubuntu16.04noarchxorg-server-hwe-16.04< 2:1.18.4-1ubuntu6.1~16.04.2UNKNOWN
ubuntu14.04noarchxorg-server-lts-xenial< 2:1.18.3-1ubuntu2.3~trusty2UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	14.04	noarch	xorg-server	< 2:1.15.1-0ubuntu2.9	UNKNOWN
ubuntu	16.04	noarch	xorg-server	< 2:1.18.4-0ubuntu0.3	UNKNOWN
ubuntu	16.04	noarch	xorg-server-hwe-16.04	< 2:1.18.4-1ubuntu6.1~16.04.2	UNKNOWN
ubuntu	14.04	noarch	xorg-server-lts-xenial	< 2:1.18.3-1ubuntu2.3~trusty2	UNKNOWN