[ASA-201801-18] glibc: privilege escalation

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201801-18
==========================================

Severity: High
Date    : 2018-01-28
CVE-ID  : CVE-2018-1000001
Package : glibc
Type    : privilege escalation
Remote  : No
Link    : https://security.archlinux.org/AVG-590

Summary
=======

The package glibc before version 2.26-11 is vulnerable to privilege
escalation.

Resolution
==========

Upgrade to 2.26-11.

# pacman -Syu "glibc>=2.26-11"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

Description
===========

A buffer underflow vulnerability has been discovered in the realpath()
function in glibc 2.26 when getcwd() returns a relative or unreachable
path (i.e. not starting with '/') which may allow privilege escalation
under certain conditions.

Impact
======

A local attacker is able to escalate privileges on the affected host.

References
==========

http://www.openwall.com/lists/oss-security/2018/01/11/5
https://sourceware.org/bugzilla/show_bug.cgi?id=22679
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94
https://security.archlinux.org/CVE-2018-1000001
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