drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Umgehung des Passworts in GRUB
Name: |
Umgehung des Passworts in GRUB |
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ID: |
201512-03 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
So, 20. Dezember 2015, 14:26 |
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Referenzen: |
https://wiki.gentoo.org/wiki/GRUB2_Quick_Start
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8370 |
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Applikationen: |
GRUB |
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Originalnachricht |
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201512-03 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: GRUB: Authentication bypass Date: December 19, 2015 Bugs: #568326 ID: 201512-03
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Synopsis ========
GRUB's authentication prompt can be bypassed by entering a sequence of backspace characters.
Background ==========
GNU GRUB is a multiboot boot loader used by most Linux systems.
Affected packages =================
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-boot/grub < 2.02_beta2-r8 *>= 0.97 * >= 2.02_beta2-r8 * ------------------------------------------------------------------- NOTE: Packages marked with asterisks require manual intervention!
Description ===========
An integer underflow in GRUB's username/password authentication code has been discovered.
Impact ======
An attacker with access to the system console may bypass the username prompt by entering a sequence of backspace characters, allowing them e.g. to get full access to GRUB's console or to load a customized kernel.
Workaround ==========
There is no known workaround at this time.
Resolution ==========
All GRUB 2.x users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-boot/grub-2.02_beta2-r8"
After upgrading, make sure to run the grub2-install command with options appropriate for your system. See the GRUB2 Quick Start guide in the references below for examples. Your system will be vulnerable until this action is performed.
References ==========
[ 1 ] CVE-2015-8370 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8370 [ 2 ] GRUB2 Quick Start guide https://wiki.gentoo.org/wiki/GRUB2_Quick_Start
Availability ============
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/201512-03
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 2015 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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