Bug 1491206 (CVE-2017-12163) - CVE-2017-12163 Samba: Server memory information leak over SMB1
Summary: CVE-2017-12163 Samba: Server memory information leak over SMB1
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-12163
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1491209 1491210 1491211 1491212 1491213 1491214 1491769 1493441
Blocks: 1488198
TreeView+ depends on / blocked
 
Reported: 2017-09-13 10:28 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-02-17 01:30 UTC (History)
15 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An information leak flaw was found in the way SMB1 protocol was implemented by Samba. A malicious client could use this flaw to dump server memory contents to a file on the samba share or to a shared printer, though the exact area of server memory cannot be controlled by the attacker.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:25:07 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2789 0 normal SHIPPED_LIVE Moderate: samba security update 2017-09-21 18:18:01 UTC
Red Hat Product Errata RHSA-2017:2790 0 normal SHIPPED_LIVE Moderate: samba security update 2017-09-21 18:06:48 UTC
Red Hat Product Errata RHSA-2017:2791 0 normal SHIPPED_LIVE Moderate: samba4 security update 2017-09-21 15:51:02 UTC
Red Hat Product Errata RHSA-2017:2858 0 normal SHIPPED_LIVE Moderate: samba security update 2017-10-04 09:12:56 UTC

Description Huzaifa S. Sidhpurwala 2017-09-13 10:28:51 UTC 
All versions of Samba are vulnerable to a server memory information leak bug over SMB1 if a client can write data to a share. Some SMB1 write requests were not correctly range checked to ensure the client had sent enough data to fulfill the write, allowing server memory contents to be written into the file (or printer) instead of client supplied data. The client cannot control the area of the server memory that is written to the file (or printer).
Comment 1 Huzaifa S. Sidhpurwala 2017-09-13 10:29:00 UTC 
Mitigation:

As this is an SMB1-only vulnerability, it can be avoided by setting the server to only use SMB2 via adding:

server min protocol = SMB2_02

to the [global] section of your smb.conf and restarting smbd.
Comment 2 Huzaifa S. Sidhpurwala 2017-09-13 10:29:06 UTC 
Acknowledgments:

Name: Yihan Lian and Zhibin Hu (Qihoo 360 Gear Team), Stefan Metzmacher (SerNet), Jeremy Allison (Google)
Comment 5 Huzaifa S. Sidhpurwala 2017-09-20 08:19:08 UTC 
External References:

https://www.samba.org/samba/security/CVE-2017-12163.html
Comment 6 Huzaifa S. Sidhpurwala 2017-09-20 08:21:25 UTC 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1493441]
Comment 7 errata-xmlrpc 2017-09-21 11:51:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:2791 https://access.redhat.com/errata/RHSA-2017:2791
Comment 8 errata-xmlrpc 2017-09-21 14:07:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2790 https://access.redhat.com/errata/RHSA-2017:2790
Comment 9 errata-xmlrpc 2017-09-21 14:19:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:2789 https://access.redhat.com/errata/RHSA-2017:2789
Comment 10 errata-xmlrpc 2017-10-04 05:14:00 UTC 
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-2017:2858 https://access.redhat.com/errata/RHSA-2017:2858
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