Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.
First Last Prev Next    This bug is not in your last search results.
Bug 1427984 - (CVE-2017-6347) CVE-2017-6347 kernel: ipv4: Incorrect IP_CHECKSUM handling
CVE-2017-6347 kernel: ipv4: Incorrect IP_CHECKSUM handling
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20170221,repor...
: Security
Depends On: 1442927 1442944
Blocks: 1427985
  Show dependency tree / graph
 
Reported: 2017-03-01 11:14 EST by Andrej Nemec
Modified: 2018-08-28 18:13 EDT (History)
33 users (show)

See Also:
Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
The skbs processed by ip_cmsg_recv() are not guaranteed to be linear (e.g. when sending UDP packets over loopback with MSGMORE). Using csum_partial() on potentially the whole skb len is dangerous; instead be on the safe side and use skb_checksum(). This may lead to an infoleak as the kernel memory may be checksummed and sent as part of the packet.
Story Points: ---
Clone Of:
Environment:
Last Closed:
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

  None (edit)
Description Andrej Nemec 2017-03-01 11:14:44 EST 
The skbs processed by ip_cmsg_recv() are not guaranteed to be linear e.g. when sending UDP packets over loopback with MSGMORE. Using csum_partial() on [potentially] the whole skb len is dangerous; instead be on the safe side and use skb_checksum().

Upstream patch:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32

References:

http://seclists.org/oss-sec/2017/q1/525
Comment 1 Fedora Update System 2017-03-02 22:50:18 EST 
kernel-4.9.13-100.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 2 Wade Mealing 2017-03-27 01:27:07 EDT 
Statement:

This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4,5,6,7 and MRG-2.
Comment 5 Wade Mealing 2017-04-18 02:07:05 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1442927]
Comment 7 Justin M. Forbes 2017-04-18 08:40:53 EDT 
This was fixed upstream in 4.10.1.  The fix was pushed to Fedora 25 with the 4.10.5 rebase on 3-27 and in Fedora 24 with the 4.10.6 rebase on 4-01.
Note You need to log in before you can comment on or make changes to this bug.
First Last Prev Next    This bug is not in your last search results.