Reference: CERT-EU Security Advisory 2016-114
Title: CVE-2015-7547: glibc getaddrinfo stack-based buffer overflow
Version history: 17/02/2016 Initial publication.


Summary:
========

Vulnerability in glibc allows unauthenticated attacker to remotely
exploit and cause:
- Denial-of-Service (DoS)
- Remote code execution (administrator / root privileges)
- Remote code execution (User)

The vulnerable library of glibc is used in OpenSSH, curl, wget and sudo.
Random code might be run by application with root privileges. Denial of
Service attack might be run on servers, such as mail servers [2].

The glibc library has been updated to fixes the vulnerability. Various
distributions have updates available. There is a Proof of Concept script
that can be used to verify if products are affected by this issue, and
verify what mitigation may be adopted [1],[3].



Affected Versions:
==================
Linux distributions are affected.



Recommendations:
===============
- Debian
Debian has glibc updates available for Debian 7.0 (Wheezy) and Debian
8.0 (Jessie) to correct the vulnerabilities. Custom packages can be
installed through the use of "Apt-get update and apt-get upgrade '. More
information can be found at the page below:
https://security-tracker.debian.org/tracker/CVE-2015-7547

- Ubuntu
The problem can be corrected by updating the system. More details:
http://www.ubuntu.com/usn/usn-2900-1/

- Red Hat
Red Hat has updates available for Red Hat Enterprise Linux 6 and 7. You
can install these updates through the command 'yum'. More information
about these updates and about any manual installation is available at:
Red Hat 6:
https://rhn.redhat.com/errata/RHSA-2016-0175.html
Red Hat 7:
https://rhn.redhat.com/errata/RHSA-2016-0176.html

- SUSE
SUSE has issued updates available to vulnerability remedy in SUSE Linux
Enterprise 11 and 12. You can install custom packages through the use of
'YaST'. You can also manually download from the SUSE FTP server
(Ftp.suse.com). For more information, please visit:
SUSE 11:
https://www.suse.com/support/update/announcement/2016/suse-su-20160470-1.html
https://www.suse.com/support/update/announcement/2016/suse-su-20160472-1.html
SUSE 12:
https://www.suse.com/support/update/announcement/2016/suse-su-20160471-1.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html



References:
==========
[1]
https://googleonlinesecurity.blogspot.be/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html

[2]
https://www.ncsc.nl/dienstverlening/response-op-dreigingen-en-incidenten/beveiligingsadviezen/NCSC-2016-0167+1.01+Kwetsbaarheid+verholpen+in+glibc.html
[3] https://github.com/fjserna/CVE-2015-7547




Best Regards,

CERT-EU Team (http://cert.europa.eu)
Phone: +32.2.2990005 / e-mail: cert-eu@ec.europa.eu
PGP KeyID 0x46AC4383
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