Sicherheit: Ausführen von Code mit höheren Privilegien in nginx

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From: Aaron Bauman <bman@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <08f0f46b-3622-3bb2-22e7-d86fe2d25e08@gentoo.org>
Subject: [ GLSA 201701-22 ] NGINX: Privilege escalation

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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 201701-22
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https://security.gentoo.org/
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Severity: Normal
Title: NGINX: Privilege escalation
Date: January 11, 2017
Bugs: #605008
ID: 201701-22

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Synopsis
========

Gentoo's NGINX ebuilds are vulnerable to privilege escalation due to
the way log files are handled.

Background
==========

nginx is a robust, small, and high performance HTTP and reverse proxy
server.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 www-servers/nginx < 1.10.2-r3 >= 1.10.2-r3

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

It was discovered that Gentoo's default NGINX installation applied
similar problematic permissions on "/var/log/nginx" as Debian
(DSA-3701) and is therefore vulnerable to the same attack described in
CVE-2016-1247.

Impact
======

A local attacker, who either is already NGINX's system user or belongs
to NGINX's group, could potentially escalate privileges.

Workaround
==========

Ensure that no untrusted user can create files in directories which are
used by NGINX (or an NGINX vhost) to store log files.

Resolution
==========

All NGINX users should upgrade to the latest ebuild revision:

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-1.10.2-r3"

References
==========

[ 1 ] CVE-2016-1247
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-1247
[ 2 ] DSA-3701
https://www.debian.org/security/2016/dsa-3701
[ 3 ] Technical analysis
https://legalhackers.com/advisories/Nginx-Exploit-Deb-Root-PrivEsc-CVE-2016-1247.html

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/201701-22

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2017 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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Gentoo Linux Security Advisory GLSA 201701-22
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<a
class=3D"moz-txt-link-freet=
ext" href=3D"https://security.gentoo.org/">https://security.gentoo.org/</=
a>
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Severity: Normal
Title: NGINX: Privilege escalation
Date: January 11, 2017
Bugs: #605008
ID: 201701-22

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D

Gentoo's NGINX ebuilds are vulnerable to privilege escalation due to
the way log files are handled.

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

nginx is a robust, small, and high performance HTTP and reverse proxy
server.

Affected packages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 www-servers/nginx < 1.10.2-r3 >=3D
1.10.=
2-r3=20

Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

It was discovered that Gentoo's default NGINX installation applied
similar problematic permissions on "/var/log/nginx" as Debian
(DSA-3701) and is therefore vulnerable to the same attack described in
CVE-2016-1247.

Impact
=3D=3D=3D=3D=3D=3D

A local attacker, who either is already NGINX's system user or belongs
to NGINX's group, could potentially escalate privileges.

Workaround
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Ensure that no untrusted user can create files in directories which are
used by NGINX (or an NGINX vhost) to store log files.

Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

All NGINX users should upgrade to the latest ebuild revision:

# emerge --sync
# emerge --ask --oneshot --verbose
">=3Dwww-servers/nginx-1.10.2-r3"=

References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

[ 1 ] CVE-2016-1247
<a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.=
cfm?cvename=3DCVE-2016-1247">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20=
16-1247</a>
[ 2 ] DSA-3701
<a class=3D"moz-txt-link-freetext" href=3D"https://www.debian.org/s=
ecurity/2016/dsa-3701">https://www.debian.org/security/2016/dsa-3701</a>
[ 3 ] Technical analysis
<a class=3D"moz-txt-link-freetext" href=3D"https://legalhackers.com=
/advisories/Nginx-Exploit-Deb-Root-PrivEsc-CVE-2016-1247.html">https://le=
galhackers.com/advisories/Nginx-Exploit-Deb-Root-PrivEsc-CVE-2016-1247.ht=
ml</a>

Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

<a class=3D"moz-txt-link-freetext" href=3D"https://security.gentoo.org/g=
lsa/201701-22">https://security.gentoo.org/glsa/201701-22</a>

Concerns?
=3D=3D=3D=3D=3D=3D=3D=3D=3D

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
<a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:security@gentoo.org"=
>security@gentoo.org</a> or alternatively, you may file a bug at
<a class=3D"moz-txt-link-freetext" href=3D"https://bugs.gentoo.org">https=
://bugs.gentoo.org</a>.

License
=3D=3D=3D=3D=3D=3D=3D

Copyright 2017 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

<a class=3D"moz-txt-link-freetext" href=3D"http://creativecommons.org/lic=
enses/by-sa/2.5">http://creativecommons.org/licenses/by-sa/2.5</a></pre>
</body>
</html>

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