CVE-2017-12163

Impact:
Moderate
Public Date:
2017-09-20
CWE:
CWE-200
Bugzilla:
1491206: CVE-2017-12163 Samba: Server memory information leak over SMB1
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.

Find out more about CVE-2017-12163 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

Red Hat Enterprise Linux 5:
This vulnerability has been rated as having a security impact of Moderate. After evaluation and in accordance with the criteria noted in the product support life cycle, there are no plans to address this issue in an upcoming release. Please contact Red Hat Support for further information.

CVSS v3 metrics

CVSS3 Base Score 4.1
CVSS3 Base Metrics CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Attack Vector Adjacent Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity Impact Low
Availability Impact None

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (samba) RHSA-2017:2790 2017-09-21
Red Hat Enterprise Linux 6 (samba4) RHSA-2017:2791 2017-09-21
Red Hat Enterprise Linux 6 (samba) RHSA-2017:2789 2017-09-21
Red Hat Gluster 3.3 Samba on RHEL-6 (samba) RHSA-2017:2858 2017-10-04
Red Hat Gluster 3.3 Samba on RHEL-7 (samba) RHSA-2017:2858 2017-10-04

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 samba Will not fix
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Acknowledgements

Red Hat would like to thank Yihan Lian and Zhibin Hu (Qihoo 360 Gear Team), Stefan Metzmacher (SerNet), and Jeremy Allison (Google) for reporting this issue.

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.

External References

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