Arch Linux: ASA-201605-19 Medium: glibc DoS and Code Execution Risk

Arch Linux Security Advisory ASA-201605-19
=========================================
Severity: Medium
Date    : 2016-05-13
CVE-ID  : CVE-2016-1234 CVE-2016-3706
Package : glibc
Type    : multiple issues
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package glibc before version 2.23-4 is vulnerable to denial of
service and possibly arbitrary code execution.

Resolution
=========
Upgrade to 2.23-4.

# pacman -Syu "glibc>=2.23-4"

The problems have been fixed upstream but no release is available yet.

Workaround
=========
None.

Description
==========
- CVE-2016-1234 (arbitrary code execution)

It was found that glob implementation in glibc does not correctly
handle overlong names in struct dirent buffers when GLOB_ALTDIRFUNC is
used, causing a large stack-based buffer overflow with controlled
length and content.

- CVE-2016-3706 (denial of service)

A stack (frame) overflow flaw, which could lead to a denial of service
(application crash), was found in the way glibc's getaddrinfo()
function processed certain requests when called with AF_INET or
AF_INET6.

Impact
=====
A remote attacker is able to perform a denial of service attack via a
vulnerability in the getaddrinfo() function.
Furthermore a local attacker may be able to execute arbitrary code via a
buffer overflow when GLOB_ALTDIRFUNC is used.

References
=========
https://access.redhat.com/security/cve/CVE-2016-1234
https://access.redhat.com/security/cve/CVE-2016-3706
https://sourceware.org/bugzilla/show_bug.cgi?id=19779
https://sourceware.org/bugzilla/show_bug.cgi?id=20010