ID de Prueba:	1.3.6.1.4.1.25623.1.0.871479
Categoría:	Red Hat Local Security Checks
Título:	RedHat Update for grub2 RHSA-2015:2401-01
Resumen:	The remote host is missing an update for the 'grub2'; package(s) announced via the referenced advisory.
Descripción:	Summary: The remote host is missing an update for the 'grub2' package(s) announced via the referenced advisory. Vulnerability Insight: The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. It was discovered that grub2 builds for EFI systems contained modules that were not suitable to be loaded in a Secure Boot environment. An attacker could use this flaw to circumvent the Secure Boot mechanisms and load non-verified code. Attacks could use the boot menu if no password was set, or the grub2 configuration file if the attacker has root privileges on the system. (CVE-2015-5281) This update also fixes the following bugs: * In one of the earlier updates, GRUB2 was modified to escape forward slash (/) characters in several different places. In one of these places, the escaping was unnecessary and prevented certain types of kernel command-line arguments from being passed to the kernel correctly. With this update, GRUB2 no longer escapes the forward slash characters in the mentioned place, and the kernel command-line arguments work as expected. (BZ#1125404) * Previously, GRUB2 relied on a timing mechanism provided by legacy hardware, but not by the Hyper-V Gen2 hypervisor, to calibrate its timer loop. This prevented GRUB2 from operating correctly on Hyper-V Gen2. This update modifies GRUB2 to use a different mechanism on Hyper-V Gen2 to calibrate the timing. As a result, Hyper-V Gen2 hypervisors now work as expected. (BZ#1150698) * Prior to this update, users who manually configured GRUB2 to use the built-in GNU Privacy Guard (GPG) verification observed the following error on boot: alloc magic is broken at [addr]: [value] Aborted. Consequently, the boot failed. The GRUB2 built-in GPG verification has been modified to no longer free the same memory twice. As a result, the mentioned error no longer occurs. (BZ#1167977) * Previously, the system sometimes did not recover after terminating unexpectedly and failed to reboot. To fix this problem, the GRUB2 packages now enforce file synchronization when creating the GRUB2 configuration file, which ensures that the required configuration files are written to disk. As a result, the system now reboots successfully after crashing. (BZ#1212114) * Previously, if an unconfigured network driver instance was selected and configured when the GRUB2 bootloader was loaded on a different instance, GRUB2 did not receive notifications of the Address Resolution Protocol (ARP) replies. Consequently, GRUB2 failed with the following error message: error: timeout: ... Description truncated, please see the referenced URL(s) for more information. Affected Software/OS: grub2 on Red Hat Enterprise Linux Server (v. 7) Solution: Please Install the Updated Packages. CVSS Score: 2.6 CVSS Vector: AV:L/AC:H/Au:N/C:P/I:P/A:N
Referencia Cruzada:	Common Vulnerability Exposure (CVE) ID: CVE-2015-5281 BugTraq ID: 77983 http://www.securityfocus.com/bid/77983 http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172942.html http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172611.html RedHat Security Advisories: RHSA-2015:2401 http://rhn.redhat.com/errata/RHSA-2015-2401.html http://www.securitytracker.com/id/1034198
Copyright	Copyright (C) 2015 Greenbone Networks GmbH

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