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Bug 1511899 - (CVE-2017-14746) CVE-2017-14746 samba: Use-after-free in processing SMB1 requests
CVE-2017-14746 samba: Use-after-free in processing SMB1 requests
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=20171121,repo...
: Security
Depends On: 1512817 1514313 1514314 1514315 1514316 1515692 1531098
Blocks: 1512469
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Reported: 2017-11-10 06:53 EST by Huzaifa S. Sidhpurwala
Modified: 2018-02-12 04:04 EST (History)
16 users (show)

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Doc Text:
A use-after-free flaw was found in the way samba servers handled certain SMB1 requests. An unauthenticated attacker could send specially-crafted SMB1 requests to cause the server to crash or execute arbitrary code.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Samba Project 13041 None None None 2017-11-14 05:47 EST
Red Hat Product Errata RHSA-2017:3260 normal SHIPPED_LIVE Important: samba security update 2017-11-27 04:39:33 EST
Red Hat Product Errata RHSA-2017:3261 normal SHIPPED_LIVE Important: samba security update 2017-11-27 04:13:12 EST
Red Hat Product Errata RHSA-2017:3278 normal SHIPPED_LIVE Important: samba4 security update 2017-11-29 08:03:46 EST

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Description Huzaifa S. Sidhpurwala 2017-11-10 06:53:16 EST 
As per upstream advisory:

All versions of Samba from 4.0.0 onwards are vulnerable to a use after free vulnerability, where a malicious SMB1 request can be used to control the contents of heap memory via a deallocated heap pointer. It is possible this may be used to compromise the SMB server.
Comment 1 Huzaifa S. Sidhpurwala 2017-11-10 06:53:33 EST 
Mitigation:

Prevent SMB1 access to the server by setting the parameter:

"server min protocol = SMB2"

to the [global] section of your smb.conf and restart smbd. This prevents and SMB1 access to the server. Note this could cause older clients to be unable to connect to the server.
Comment 3 Huzaifa S. Sidhpurwala 2017-11-16 22:50:07 EST 
Acknowledgements:

Name: the Samba project
Upstream: Yihan Lian (Qihoo 360 Gear Team), Zhibin Hu (Qihoo 360 Gear Team)
Comment 5 Huzaifa S. Sidhpurwala 2017-11-21 03:59:23 EST 
External References:

https://www.samba.org/samba/security/CVE-2017-14746.html
Comment 6 Huzaifa S. Sidhpurwala 2017-11-21 04:01:27 EST 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1515692]
Comment 8 errata-xmlrpc 2017-11-26 23:13:36 EST 
This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.3 for RHEL 6
  Red Hat Gluster Storage 3.3 for RHEL 7

Via RHSA-2017:3261 https://access.redhat.com/errata/RHSA-2017:3261
Comment 9 errata-xmlrpc 2017-11-26 23:39:55 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:3260 https://access.redhat.com/errata/RHSA-2017:3260
Comment 10 errata-xmlrpc 2017-11-29 03:04:11 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:3278 https://access.redhat.com/errata/RHSA-2017:3278
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