Bug 1462158 (CVE-2017-1000371) - CVE-2017-1000371 kernel: offset2lib allows for the stack guard page to be jumped over
Summary: CVE-2017-1000371 kernel: offset2lib allows for the stack guard page to be jum...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-1000371
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: 1462829 1485758 1485759 1485760 1485761
Blocks: 1473655
TreeView+ depends on / blocked
 
Reported: 2017-06-16 10:42 UTC by Andrej Nemec
Modified: 2023-09-07 18:53 UTC (History)
36 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel's implementation of mapping ELF PIE binary loading to allow evasion of the stack-guard page protection mechanisms that intend to mitigate this behavior. This issue appears to be limited to i386 based systems.
Clone Of:
Environment:
Last Closed: 2020-04-22 10:31:46 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:1524 0 None None None 2020-04-22 07:35:12 UTC

Description Andrej Nemec 2017-06-16 10:42:55 UTC 
The offset2lib patch as used by the Linux Kernel contains a vulnerability, if RLIMIT_STACK is set to RLIM_INFINITY and 1 Gigabyte of memory is allocated (the maximum under the 1/4 restriction) then the stack will be grown down to 0x80000000, and as the PIE binary is mapped above 0x80000000 the minimum distance between the end of the PIE binary's read-write segment and the start of the stack becomes small enough that the stack guard page can be jumped over by an attacker. This affects Linux Kernel version 4.11.5. This is a different issue than CVE-2017-1000370 and CVE-2017-1000365. This issue appears to be limited to i386 based systems.


Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eab09532d40090698b05a07c1c87f39fdbc5fab5
Comment 1 Andrej Nemec 2017-06-16 10:43:07 UTC 
Acknowledgments:

Name: Qualys Inc
Comment 2 Andrej Nemec 2017-06-16 10:44:00 UTC 
External References:

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
Comment 3 Petr Matousek 2017-06-19 16:08:31 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1462829]
Comment 5 Wade Mealing 2017-08-28 03:05:41 UTC 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat
Enterprise Linux 7, MRG-2 and realtime kernels.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.
Future Linux kernel updates for the respective releases may address this issue.
Comment 11 errata-xmlrpc 2020-04-22 07:35:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2020:1524 https://access.redhat.com/errata/RHSA-2020:1524
Comment 12 Product Security DevOps Team 2020-04-22 10:31:46 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2017-1000371
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