Bugzilla will be upgraded to version 5.0 on a still to be determined date in the near future. The original upgrade date has been delayed.
Bug 663542 - (CVE-2010-4347) CVE-2010-4347 kernel: local privilege escalation via /sys/kernel/debug/acpi/custom_method
CVE-2010-4347 kernel: local privilege escalation via /sys/kernel/debug/acpi/c...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
: Security
Depends On: 663543
  Show dependency treegraph
Reported: 2010-12-16 00:47 EST by Eugene Teo (Security Response)
Modified: 2015-07-31 02:35 EDT (History)
7 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2013-03-10 23:11:40 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:0330 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2011-03-10 15:04:13 EST

  None (edit)
Description Eugene Teo (Security Response) 2010-12-16 00:47:40 EST
Reported by Dave Jones, currently we have:

--w--w--w-. 1 root root 0 2010-11-11 14:56 /sys/kernel/debug/acpi/custom_method

which is just crazy. Change this to --w-------.

This custom_method file allows to inject custom ACPI methods into the ACPI interpreter tables. This control file was introduced with world writeable permissions in Linux Kernel 2.6.33.

Introduced in:

Fixed in:
Comment 2 Eugene Teo (Security Response) 2010-12-16 01:01:34 EST

This issue did not affect the version of Linux kernel as shipped with Red Hat
Enterprise Linux 4, 5, and 6 as they did not include upstream commit a1a541d8 and a25ee920 that introduced the problem. This has been addressed in Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-0330.html.


This requires debugfs to be mounted on a local system in order to have access to the custom_method file. Debugfs is not mounted by default. You need to run "mount -t debugfs nodev /sys/kernel/debug" as root first.
Comment 3 errata-xmlrpc 2011-03-10 15:04:58 EST
This issue has been addressed in following products:

  MRG for RHEL-5

Via RHSA-2011:0330 https://rhn.redhat.com/errata/RHSA-2011-0330.html

Note You need to log in before you can comment on or make changes to this bug.