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Category:   Application (Generic)  >   GNU GRUB Vendors:   GNU [multiple authors]
(Oracle Issues Fix for Oracle Linux) GNU GRUB Authentication Bug Lets Local Users Bypass Authentication and Gain Elevated Privileges
SecurityTracker Alert ID:  1034425
SecurityTracker URL:  http://securitytracker.com/id/1034425
CVE Reference:   CVE-2015-8370   (Links to External Site)
Date:  Dec 15 2015
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.98 - 2.02
Description:   A vulnerability was reported in GNU GRUB. A local user can obtain elevated privileges on the target system.

A local user can bypass authentication and gain full control of the target system.

The vulnerability resides in 'grub-core/lib/crypto.c' and 'grub-core/normal/auth.c'.

The original advisory is available at:

http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html

Hector Marco and Ismael Ripoll reported this vulnerability.

Impact:   A local user can obtain full control of the target system.
Solution:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2015-2623.html

Vendor URL:  linux.oracle.com/errata/ELSA-2015-2623.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Dec 15 2015 GNU GRUB Authentication Bug Lets Local Users Bypass Authentication and Gain Elevated Privileges



 Source Message Contents

Subject:  [El-errata] ELSA-2015-2623 Moderate: Oracle Linux 7 grub2 security and bug fix update

Oracle Linux Security Advisory ELSA-2015-2623

http://linux.oracle.com/errata/ELSA-2015-2623.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
grub2-2.02-0.33.0.1.el7_2.x86_64.rpm
grub2-efi-2.02-0.33.0.1.el7_2.x86_64.rpm
grub2-efi-modules-2.02-0.33.0.1.el7_2.x86_64.rpm
grub2-tools-2.02-0.33.0.1.el7_2.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/grub2-2.02-0.33.0.1.el7_2.src.rpm



Description of changes:

[2.02-0.33.0.1]
- Fix comparison in patch for 18504756
- Remove symlink to grub environment file during uninstall on EFI platforms
   [bug 19231481]
- update Oracle Linux certificates (Alexey Petrenko)
- Put "with" in menuentry instead of "using" [bug 18504756]
- Use different titles for UEK and RHCK kernels [bug 18504756]

[2.02-0.33]
- Don't remove 01_users, it's the wrong thing to do.
   Related:rhbz1290089

[2.02-0.32]
- Rebuild for .z so the release number is different.
   Related: rhbz#1290089

[2.02-0.31]
- More work on handling of GRUB2_PASSWORD
   Resolves: rhbz#1290089

[2.02-0.30]
- Fix security issue when reading username and password
   Resolves: CVE-2015-8370
- Do a better job of handling GRUB_PASSWORD
   Resolves: rhbz#1290089


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