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Bug 1443615 - (CVE-2017-7645) CVE-2017-7645 kernel: nfsd: Incorrect handling of long RPC replies
CVE-2017-7645 kernel: nfsd: Incorrect handling of long RPC replies
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20170414,repo...
: Security
Depends On: 1447647 1442407 1443617 1447168 1447640 1447641 1447642 1447643 1447644 1447645 1447646
Blocks: 1443616
  Show dependency treegraph
 
Reported: 2017-04-19 10:45 EDT by Andrej Nemec
Modified: 2018-08-28 23:03 EDT (History)
36 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The NFS2/3 RPC client could send long arguments to the NFS server. These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program could use this flaw to crash the kernel, resulting in denial of service.
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1615 normal SHIPPED_LIVE Important: kernel security and bug fix update 2017-06-29 12:41:56 EDT
Red Hat Product Errata RHSA-2017:1616 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-06-28 16:57:58 EDT
Red Hat Product Errata RHSA-2017:1647 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-06-28 16:34:27 EDT
Red Hat Product Errata RHSA-2018:1319 None None None 2018-05-08 14:59 EDT

  None (edit)
Description Andrej Nemec 2017-04-19 10:45:10 EDT
The Linux kernel built with the NFS Server Support(CONFIG_NFSD) is vulnerable to an out-of-bounds memory access issue. It could occur while processing arbitrarily long arguments sent by the NFSv2/NFSv3 PRC clients.

A remote RPC user/program could use this flaw to crash the krenel, resulting in DoS.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/e6838a29ecb484c97e4efef9429643b9851fba6e

References:
-----------
  -> https://marc.info/?l=linux-nfs&m=149218228327497&w=2
  -> http://seclists.org/oss-sec/2017/q2/195
Comment 1 Andrej Nemec 2017-04-19 10:46:12 EDT
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1443617]
Comment 2 Prasad J Pandit 2017-05-03 07:36:54 EDT
Statement:

This issue affects the versions of the Linux kernel as shipped with
Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future kernel
updates for Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 may
address this issue.
Comment 10 errata-xmlrpc 2017-06-28 12:36:21 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:1647 https://access.redhat.com/errata/RHSA-2017:1647
Comment 11 errata-xmlrpc 2017-06-28 13:05:11 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1615 https://access.redhat.com/errata/RHSA-2017:1615
Comment 12 errata-xmlrpc 2017-06-28 13:08:31 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1616 https://access.redhat.com/errata/RHSA-2017:1616
Comment 13 errata-xmlrpc 2018-05-08 14:59:08 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:1319 https://access.redhat.com/errata/RHSA-2018:1319

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