Bug 1175235 (CVE-2014-9420)

Summary: CVE-2014-9420 Kernel: fs: isofs: infinite loop in CE record entries
Product: [Other] Security Response Reporter: Prasad Pandit <ppandit>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: agordeev, aquini, bhu, carnil, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jrusnack, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, pmatouse, rt-maint, rvrbovsk, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
It was found that the Linux kernel's ISO file system implementation did not correctly limit the traversal of Rock Ridge extension Continuation Entries (CE). An attacker with physical access to the system could use this flaw to trigger an infinite loop in the kernel, resulting in a denial of service.
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-06-23 12:16:27 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: 1175243, 1175245, 1175246, 1175248, 1175249, 1175250, 1223787, 1223788    
Bug Blocks: 1173071    

Description Prasad Pandit 2014-12-17 10:57:21 UTC
Linux kernel built with the iso9660 file system(CONFIG_ISO9660_FS) support is
vulnerable to an infinite recursion loop flaw, which could lead to a crash or
render a system unresponsive/unusable after a while. The occurs while mounting
an iso9660 image.

An unprivileged user/process could use this flaw to crash the system resulting
in DoS.

Upstream fix:
-------------
  -> https://git.kernel.org/linus/f54e18f1b831c92f6512d2eedb224cd63d607d3d

Comment 1 Prasad Pandit 2014-12-17 11:06:19 UTC
Statement:

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for the respective releases may address this issue.

Comment 2 Prasad Pandit 2014-12-17 11:06:54 UTC
Red Hat Enterprise Linux 5 is in Production 3 Phase of the support and maintenance life cycle. This issue has been rated as having Low security impact and is currently not planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle:

  -> https://access.redhat.com/support/policy/updates/errata/

Comment 3 Prasad Pandit 2014-12-17 11:11:03 UTC
Acknowledgements:

Red Hat would like to thank Carl Henrik Lunde for reporting this issue.

Comment 6 Prasad Pandit 2014-12-17 11:13:51 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1175250]

Comment 7 Fedora Update System 2015-01-11 02:58:23 UTC
kernel-3.17.8-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2015-01-13 00:05:58 UTC
kernel-3.17.8-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 errata-xmlrpc 2015-06-09 14:48:29 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1081 https://rhn.redhat.com/errata/RHSA-2015-1081.html

Comment 12 errata-xmlrpc 2015-06-23 08:25:19 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1139 https://rhn.redhat.com/errata/RHSA-2015-1139.html

Comment 13 errata-xmlrpc 2015-06-23 08:28:13 UTC
This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2015:1138 https://rhn.redhat.com/errata/RHSA-2015-1138.html

Comment 14 errata-xmlrpc 2015-06-23 08:47:12 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1137 https://rhn.redhat.com/errata/RHSA-2015-1137.html