drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Überschreiben von Dateien in libvirt
Name: |
Überschreiben von Dateien in libvirt |
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ID: |
201612-10 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
So, 4. Dezember 2016, 16:41 |
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Referenzen: |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5313 |
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Applikationen: |
libvirt |
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Originalnachricht |
This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --6fioRDWpw9A71V4UrWVCODmo0uw0ncocr Content-Type: multipart/mixed; boundary="BXguS4p0V28jbsle5p7blQDjrwd5WW5Gi" From: Aaron Bauman <bman@gentoo.org> To: gentoo-announce@lists.gentoo.org Message-ID: <1aa60829-2e7d-a627-6e45-7d2d5b42566b@gentoo.org> Subject: [ GLSA 201612-10 ] libvirt: Directory traversal
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This is a multi-part message in MIME format. --------------5134F863D2FA49E12F480816 Content-Type: text/plain; charset=utf- Content-Transfer-Encoding: quoted-printable
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201612-10 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: libvirt: Directory traversal Date: December 04, 2016 Bugs: #568870 ID: 201612-10
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Synopsis ========
Libvirt is vulnerable to directory traversal when using Access Control Lists (ACL).
Background ==========
libvirt is a C toolkit for manipulating virtual machines.
Affected packages =================
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-emulation/libvirt < 1.2.21-r1 >= 1.2.21-r1
Description ===========
Normally, only privileged users can coerce libvirt into creating or opening existing files using the virStorageVol APIs; and such users already have full privilege to create any domain XML.
But in the case of fine-grained ACLs, it is feasible that a user can be granted storage_vol:create but not domain:write, and it violates assumptions if such a user can abuse libvirt to access files outside of the storage pool.
Impact ======
When fine-grained Access Control Lists (ACL) are in effect, an authenticated local user with storage_vol:create permission but without domain:write permission maybe able to create or access arbitrary files outside of the storage pool.
Workaround ==========
Don't make use of fine-grained Access Control Lists (ACL) in libvirt; In Gentoo, libvirt's ACL support is disable by default unless you enable the "policykit" USE flag.
Resolution ==========
All libvirt users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot -v ">=app-emulation/libvirt-1.2.21-r1"
References ==========
[ 1 ] CVE-2015-5313 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5313
Availability ============
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/201612-10
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 2016 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
--------------5134F863D2FA49E12F480816 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
<html> <head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf= -8"> </head> <body bgcolor=3D"#FFFFFF" text=3D"#000000"> <p> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Du= tf-8"> </p> <pre style=3D"color: rgb(0, 0, 0); font-style: normal; font-variant-l= igatures: normal; font-variant-caps: normal; font-weight: normal; letter-= spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-tr= ansform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0= px; word-wrap: break-word; white-space: pre-wrap;">- - - - - - - - - - - = - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201612-10 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - <a class=3D"moz-txt-link-freet= ext" href=3D"https://security.gentoo.org/">https://security.gentoo.org/</= a> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: libvirt: Directory traversal Date: December 04, 2016 Bugs: #568870 ID: 201612-10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis =3D=3D=3D=3D=3D=3D=3D=3D
Libvirt is vulnerable to directory traversal when using Access Control Lists (ACL).
Background =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
libvirt is a C toolkit for manipulating virtual machines.
Affected packages =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-emulation/libvirt < 1.2.21-r1 >=3D 1.2.2= 1-r1=20
Description =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Normally, only privileged users can coerce libvirt into creating or opening existing files using the virStorageVol APIs; and such users already have full privilege to create any domain XML.
But in the case of fine-grained ACLs, it is feasible that a user can be granted storage_vol:create but not domain:write, and it violates assumptions if such a user can abuse libvirt to access files outside of the storage pool.
Impact =3D=3D=3D=3D=3D=3D
When fine-grained Access Control Lists (ACL) are in effect, an authenticated local user with storage_vol:create permission but without domain:write permission maybe able to create or access arbitrary files outside of the storage pool.
Workaround =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Don't make use of fine-grained Access Control Lists (ACL) in libvirt; In Gentoo, libvirt's ACL support is disable by default unless you enable the "policykit" USE flag.
Resolution =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
All libvirt users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot -v ">=3Dapp-emulation/libvirt-1.2.21-r1"
References =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[ 1 ] CVE-2015-5313 <a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.= cfm?cvename=3DCVE-2015-5313">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20= 15-5313</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/201612-10">https://security.gentoo.org/glsa/201612-10</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 2016 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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