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Red Hat 7 RHSA-2014:1802-01 Moderate: Kernel Security Patch

red hat
Calendar Grey November 4, 2014
Dist Redhat Esm H88
Newly released shim updates for Red Hat Enterprise Linux 7 tackle several vulnerabilities. Essential information and recommended fixes are provided.
Updated shim packages that fix three security issues are now available for Red Hat Enterprise Linux 7

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258

Summary

Shim is the initial UEFI bootloader that handles chaining to a trusted full bootloader under secure boot environments.
A heap-based buffer overflow flaw was found the way shim parsed certain IPv6 addresses. If IPv6 network booting was enabled, a malicious server could supply a crafted IPv6 address that would cause shim to crash or, potentially, execute arbitrary code. (CVE-2014-3676)
An out-of-bounds memory write flaw was found in the way shim processed certain Machine Owner Keys (MOKs). A local attacker could potentially use this flaw to execute arbitrary code on the system. (CVE-2014-3677)
An out-of-bounds memory read flaw was found in the way shim parsed certain IPv6 packets. A specially crafted DHCPv6 packet could possibly cause shim to crash, preventing the system from booting if IPv6 booting was enabled. (CVE-2014-3675)
Red Hat would like to thank the SUSE Security Team for reporting these issues.
All shim users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat buffer overflow memory corruption shim

References

https://access.redhat.com/security/cve/CVE-2014-3675 https://access.redhat.com/security/cve/CVE-2014-3676 https://access.redhat.com/security/cve/CVE-2014-3677 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: shim-0.7-8.el7_0.src.rpm shim-signed-0.7-8.el7_0.src.rpm
x86_64: mokutil-0.7-8.el7_0.x86_64.rpm shim-0.7-8.el7_0.x86_64.rpm shim-debuginfo-0.7-8.el7_0.x86_64.rpm shim-unsigned-0.7-8.el7_0.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: shim-0.7-8.el7_0.src.rpm shim-signed-0.7-8.el7_0.src.rpm
x86_64: mokutil-0.7-8.el7_0.x86_64.rpm shim-0.7-8.el7_0.x86_64.rpm shim-debuginfo-0.7-8.el7_0.x86_64.rpm shim-unsigned-0.7-8.el7_0.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: shim-0.7-8.el7_0.src.rpm shim-signed-0.7-8.el7_0.src.rpm
x86_64: mokutil-0.7-8.el7_0.x86_64.rpm shim-0.7-8.el7_0.x86_64.rpm shim-debuginfo-0.7-8.el7_0.x86_64.rpm shim-unsigned-0.7-8.el7_0.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source: shim-0.7-8.el7_0.src.rpm shim-signed-0.7-8.el7_0.src.rpm
x86_64: mokutil-0.7-8.el7_0.x86_64.rpm shim-0.7-8.el7_0.x86_64.rpm shim-debuginfo-0.7-8.el7_0.x86_64.rpm shim-unsigned-0.7-8.el7_0.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/


Advisory ID: RHSA-2014:1801-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2014:1801.html
Issue date: 2014-11-04

Topic

Updated shim packages that fix three security issues are now available forRed Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having Moderate securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat buffer overflow memory corruption shim

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Bugs Fixed

1148230 - CVE-2014-3675 shim: out-of-bounds memory read flaw in DHCPv6 packet processing

1148231 - CVE-2014-3676 shim: heap-based buffer overflow flaw in IPv6 address parsing

1148232 - CVE-2014-3677 shim: memory corruption flaw when processing Machine Owner Keys (MOKs)

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