Bug 1406085 (CVE-2016-7916) - CVE-2016-7916 kernel: proc: prevent accessing /proc/<pid>/environ until it's ready
Summary: CVE-2016-7916 kernel: proc: prevent accessing /proc/<pid>/environ until it's ...
Keywords:
Status: NEW
Alias: CVE-2016-7916
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1406088
Blocks: 1395269
TreeView+ depends on / blocked
 
Reported: 2016-12-19 16:41 UTC by Vladis Dronov
Modified: 2020-09-15 18:44 UTC (History)
17 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Race condition in the environ_read() function in 'fs/proc/base.c' in the Linux kernel before 4.5.4 allows local users to obtain sensitive information from kernel memory by reading a '/proc/*/environ' file during a process-setup time interval in which environment-variable copying is incomplete.
Clone Of:
Environment:
Last Closed:


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2017:3163 normal SHIPPED_LIVE new packages: kernel-alt 2017-11-09 14:59:25 UTC

Description Vladis Dronov 2016-12-19 16:41:47 UTC
Race condition in the environ_read() function in 'fs/proc/base.c' in the Linux kernel before 4.5.4 allows local users to obtain sensitive information from kernel memory by reading a '/proc/*/environ' file during a process-setup time interval in which environment-variable copying is incomplete.

References:

https://forums.grsecurity.net/viewtopic.php?f=3&t=4363

https://bugzilla.kernel.org/show_bug.cgi?id=116461

http://source.android.com/security/bulletin/2016-11-01.html

https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7916

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8148a73c9901a8794a50f950083c00ccf97d43b3

Comment 4 Vladis Dronov 2016-12-19 16:57:33 UTC
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as the code with the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG-2. This has been rated as having Low security impact and is not currently 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/.


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