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Red Hat Security Advisory
Synopsis: Moderate: shim security update
Advisory ID: RHSA-2014:1801-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1801.html
Issue date: 2014-11-04
CVE Names: CVE-2014-3675 CVE-2014-3676 CVE-2014-3677
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1. Summary:
Updated shim packages that fix three security issues are now available for
Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.
2. 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
3. Description:
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.
4. 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
5. Bugs fixed (https://bugzilla.redhat.com/):
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)
6. 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/
7. 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
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2014 Red Hat, Inc.
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