CVE-2018-1000001

2018-01-1100:00:00

ubuntu.com

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

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.005 Low

EPSS

Percentile

76.8%

JSON

In glibc 2.26 and earlier there is confusion in the usage of getcwd() by
realpath() which can be used to write before the destination buffer leading
to a buffer underflow and potential code execution.

Bugs

Notes

Author	Note
seth-arnold	I wonder where Go, busybox, and similar “do it ourselves” tools fit. I added dietlibc and musl to this page out of an abundance of caution. Someone should investigate.
sbeattie	introduced a regression in glusterfs geo-rep due to its usage of rsync. See redhat bug for compensating patch for rsync.
msalvatore	Unlike in glibc, this issue does not cause a buffer underflow in musl. Furthermore, realpath() does not call getcwd() in musl.

OSVersionArchitecturePackageVersionFilename
ubuntu14.04noarcheglibc< 2.19-0ubuntu6.14UNKNOWN
ubuntu17.10noarchglibc< 2.26-0ubuntu2.1UNKNOWN
ubuntu16.04noarchglibc< 2.23-0ubuntu10UNKNOWN
ubuntu14.04noarchmusl< 0.9.15-1ubuntu0.1~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchmusl< 1.1.9-1ubuntu0.1~esm2UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	14.04	noarch	eglibc	< 2.19-0ubuntu6.14	UNKNOWN
ubuntu	17.10	noarch	glibc	< 2.26-0ubuntu2.1	UNKNOWN
ubuntu	16.04	noarch	glibc	< 2.23-0ubuntu10	UNKNOWN
ubuntu	14.04	noarch	musl	< 0.9.15-1ubuntu0.1~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	musl	< 1.1.9-1ubuntu0.1~esm2	UNKNOWN