Bug 1430347 (CVE-2016-10200) - CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation feature
Summary: CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation fe...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-10200
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1441553 1441554 1441555 1441556 1441557
Blocks: 1430348
TreeView+ depends on / blocked
 
Reported: 2017-03-08 12:25 UTC by Andrej Nemec
Modified: 2021-02-17 02:29 UTC (History)
32 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:08:52 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 18:22:09 UTC
Red Hat Product Errata RHSA-2017:2077 0 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 18:13:37 UTC
Red Hat Product Errata RHSA-2017:2437 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2017-08-08 20:14:23 UTC
Red Hat Product Errata RHSA-2017:2444 0 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-08-08 22:50:57 UTC

Description Andrej Nemec 2017-03-08 12:25:20 UTC 
A flaw was found on the linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature in the Linux kernel before 4.8.14 allows local users to gain privileges or cause a denial of service (use-after-free) by making multiple bind system calls without properly ascertaining whether a socket has the SOCK_ZAPPED status, related to net/l2tp/l2tp_ip.c and net/l2tp/l2tp_ip6.c.

Upstream patch:

https://github.com/torvalds/linux/commit/32c231164b76

Follow-up upstream patches:

https://github.com/torvalds/linux/commit/0382a25af3c7
https://github.com/torvalds/linux/commit/a3c18422a4b4
https://github.com/torvalds/linux/commit/d5e3a190937a
https://github.com/torvalds/linux/commit/df90e6886146
https://github.com/torvalds/linux/commit/31e2f21fb35b

Merge commit of the above series:

https://github.com/torvalds/linux/commit/7752f72748db

Another follow-up upstream patch:

https://github.com/torvalds/linux/commit/94d7ee0baa8b

References:

https://source.android.com/security/bulletin/2017-03-01.html
Comment 5 Adam Mariš 2017-04-18 06:42:46 UTC 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 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 MRG-2.  Future Linux kernel updates for the respective releases may address this issue.
Comment 8 errata-xmlrpc 2017-08-01 19:13:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 9 errata-xmlrpc 2017-08-02 07:54:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 10 errata-xmlrpc 2017-08-08 16:21:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Extended Update Support

Via RHSA-2017:2437 https://access.redhat.com/errata/RHSA-2017:2437
Comment 11 errata-xmlrpc 2017-08-08 18:58:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2444 https://access.redhat.com/errata/RHSA-2017:2444
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