Bug 1491206 – CVE-2017-12163 Samba: Server memory information leak over SMB1

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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

Status:	NEW

Aliases:	CVE-2017-12163

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20170920,repor...
Keywords:	Security

Depends On:	1491209 1491210 1491211 1491212 1491213 1491214 1491769 1493441
Blocks:	1488198
	Show dependency tree / graph

Reported:	2017-09-13 06:28 EDT by Huzaifa S. Sidhpurwala
Modified:	2018-01-24 07:29 EST (History)
CC List:	16 users (show)

See Also:
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.
Story Points:	---
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Environment:
Last Closed:
Type:	---
Regression:	---
Mount Type:	---
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CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:2789	normal	SHIPPED_LIVE	Moderate: samba security update	2017-09-21 14:18:01 EDT
Red Hat Product Errata	RHSA-2017:2790	normal	SHIPPED_LIVE	Moderate: samba security update	2017-09-21 14:06:48 EDT
Red Hat Product Errata	RHSA-2017:2791	normal	SHIPPED_LIVE	Moderate: samba4 security update	2017-09-21 11:51:02 EDT
Red Hat Product Errata	RHSA-2017:2858	normal	SHIPPED_LIVE	Moderate: samba security update	2017-10-04 05:12:56 EDT

Groups: None (edit)

Description Huzaifa S. Sidhpurwala 2017-09-13 06:28:51 EDT

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 06:29:00 EDT

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 06:29:06 EDT

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 04:19:08 EDT

External References:

https://www.samba.org/samba/security/CVE-2017-12163.html

Comment 6 Huzaifa S. Sidhpurwala 2017-09-20 04:21:25 EDT

Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1493441]

Comment 7 errata-xmlrpc 2017-09-21 07:51:53 EDT

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 10:07:59 EDT

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 10:19:37 EDT

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 01:14:00 EDT

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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