Bug 1148230 (CVE-2014-3675)

Summary: CVE-2014-3675 shim: out-of-bounds memory read flaw in DHCPv6 packet processing
Product: [Other] Security Response Reporter: Murray McAllister <mmcallis>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: chazlett, jrusnack, kbsingh, pholica, pjones, security-response-team, vdanen
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: shim-0.7-8.el7 Doc Type: Bug Fix
Doc Text:
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.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2014-11-04 18:50:10 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1148239, 1148240, 1152388    
Bug Blocks: 1148235    
Attachments:
Description Flags
proposed patch none

Description Murray McAllister 2014-10-01 02:39:31 UTC 
An out-of-bounds memory read flaw was found in shim when IPv6 network booting was enabled. A specially-crafted DHCPv6 packet could possibly cause shim to crash, preventing the system from booting.

Note that performing a secure boot over the network is not a common scenario.

Acknowledgements:

Red Hat would like to thank the SUSE Security Team for reporting this issue.
Comment 2 Murray McAllister 2014-10-01 02:57:15 UTC 
Created attachment 942902 [details]
proposed patch
Comment 5 Murray McAllister 2014-10-14 03:59:32 UTC 
Public now:

http://seclists.org/oss-sec/2014/q4/311
Comment 6 Murray McAllister 2014-10-14 04:02:33 UTC 
Created shim tracking bugs for this issue:

Affects: fedora-all [bug 1152388]
Comment 8 Fedora Update System 2014-11-01 17:07:36 UTC 
shim-0.8-1.fc22, shim-signed-0.8-1.fc22, mokutil-0.2.0-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 Martin Prpič 2014-11-04 10:25:52 UTC 
IssueDescription:

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.
Comment 10 errata-xmlrpc 2014-11-04 17:56:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:1801 https://rhn.redhat.com/errata/RHSA-2014-1801.html
Comment 11 Fedora Update System 2014-11-12 02:36:02 UTC 
mokutil-0.2.0-1.fc19, shim-signed-0.8-2 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 12 Fedora Update System 2014-11-12 02:40:58 UTC 
mokutil-0.2.0-1.fc20, shim-signed-0.8-3 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.