Bug 1312298 (CVE-2016-2117) - CVE-2016-2117 kernel: Kernel memory leakage to ethernet frames due to buffer overflow in ethernet drivers
Summary: CVE-2016-2117 kernel: Kernel memory leakage to ethernet frames due to buffer ...
Status: CLOSED ERRATA
Alias: CVE-2016-2117
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: impact=low,public=20160316,reported=2...
Keywords: Security
Depends On: 1318336 1320105 1320106 1320107 1320108 1320109
Blocks: 1312299
TreeView+ depends on / blocked
 
Reported: 2016-02-26 10:52 UTC by Adam Mariš
Modified: 2019-06-11 11:13 UTC (History)
21 users (show)

(edit)
It was discovered that the atl2_probe() function in the Atheros L2 Ethernet driver in the Linux kernel incorrectly enabled scatter/gather I/O. A remote attacker could use this flaw to obtain potentially sensitive information from the kernel memory.
Clone Of:
(edit)
Last Closed: 2019-06-08 02:48:57 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2574 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2016-11-03 12:06:10 UTC
Red Hat Product Errata RHSA-2016:2584 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2016-11-03 12:08:49 UTC

Description Adam Mariš 2016-02-26 10:52:43 UTC
It was reported that due to buffer overflow, it is possible for remote TCP endpoint to trigger the opposite TCP endpoint to write to a socket in sequence which causes the ethernet driver to send arbitrary kernel data over the ethernet interface instead of a portion of the intended packet data.

Initially this issue was believed to be present in a number of mainline drivers in 3.10.x and 4.4.2 vanilla kernel sources. After further investigation it was found that only [atl2] driver (code in drivers/net/ethernet/atheros/atlx/atl2.c) from the list of suspected drivers is vulnerable.

As a result, certain conditions should be met to trigger the issue:
- the [atl2] driver and the corresponding network card (which believed to be not so frequently used) should be present on the target system
- an application should make such a sequence of calls that a network buffer for the data to be transmitted is scattered
- hardware checksumming should be enabled so the packet checksum is correct

The above makes this vulnerability less probable to be hit.

Comment 1 Andrej Nemec 2016-03-16 14:40:38 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1318336]

Comment 2 Andrej Nemec 2016-03-16 14:41:00 UTC
Public via:

http://seclists.org/oss-sec/2016/q1/658

Comment 3 Vladis Dronov 2016-03-22 09:46:53 UTC
Acknowledgments:

Name: Justin Yackoski (Cryptonite)

Comment 4 Vladis Dronov 2016-03-22 09:59:52 UTC
Statement:

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

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 6 as the suspected driver does not advertise that it has scatter-gather feature, which presence is essential for the flaw.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2, namely the [atl2] Ethernet driver which is the only driver affected. Future Linux kernel updates for the respective releases might address this issue.

Comment 11 errata-xmlrpc 2016-11-03 15:45:13 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html

Comment 12 errata-xmlrpc 2016-11-03 19:42:52 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html

Comment 13 errata-xmlrpc 2016-11-03 21:33:06 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html

Comment 14 errata-xmlrpc 2016-11-03 21:48:14 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html


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