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CVE-2018-1000001

Published: 11 January 2018

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.

From the Ubuntu Security Team

libc does not account for all the possible return values from the kernel getcwd(2) syscall; arbitrary code execution may result from applications making further assumptions on the return value from the getcwd(3) libary function.

Notes

AuthorNote
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.

Priority

High

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
dietlibc
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable
(vulnerable code not present)
cosmic Ignored
(end of life)
disco Not vulnerable
(vulnerable code not present)
eoan Not vulnerable
(vulnerable code not present)
trusty Does not exist
(trusty was needs-triage)
upstream Not vulnerable
(vulnerable code not present)
xenial Not vulnerable
(vulnerable code not present)
zesty Ignored
(end of life)
eglibc
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

trusty
Released (2.19-0ubuntu6.14)
upstream Needed

xenial Does not exist

zesty Does not exist

glibc
Launchpad, Ubuntu, Debian
artful
Released (2.26-0ubuntu2.1)
bionic Not vulnerable
(2.26-0ubuntu2.1)
cosmic Not vulnerable
(2.26-0ubuntu2.1)
disco Not vulnerable
(2.26-0ubuntu2.1)
eoan Not vulnerable
(2.26-0ubuntu2.1)
trusty Does not exist

upstream Needed

xenial
Released (2.23-0ubuntu10)
zesty Ignored
(end of life)
Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94

musl
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable
(1.1.19-1)
cosmic Not vulnerable
(1.1.19-1)
disco Not vulnerable
(1.1.19-1)
eoan Not vulnerable
(1.1.19-1)
upstream
Released (1.1.19)
zesty Ignored
(end of life)
trusty
Released (0.9.15-1ubuntu0.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (1.1.9-1ubuntu0.1~esm2)
Available with Ubuntu Pro
Patches:

upstream: https://git.musl-libc.org/cgit/musl/commit/?id=23ddab8569ef8ae3488c1d67b6bccaa081c73245

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H