CVE-2017-14746

Impact:
Important
Public Date:
2017-11-21
Bugzilla:
1511899: CVE-2017-14746 samba: Use-after-free in processing SMB1 requests
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.

Find out more about CVE-2017-14746 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v3 metrics

CVSS3 Base Score 6.3
CVSS3 Base Metrics CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector Adjacent Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Impact Low
Availability Impact Low

Red Hat Security Errata

Platform Errata Release Date
Red Hat Gluster 3.3 Samba on RHEL-7 (samba) RHSA-2017:3261 2017-11-27
Red Hat Enterprise Linux 6 (samba4) RHSA-2017:3278 2017-11-29
Red Hat Gluster 3.3 Samba on RHEL-6 (samba) RHSA-2017:3261 2017-11-27
Red Hat Enterprise Linux 7 (samba) RHSA-2017:3260 2017-11-27

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 samba Not affected
Red Hat Enterprise Linux 5 samba Not affected

Acknowledgements

Red Hat would like to thank the Samba project for reporting this issue. Upstream acknowledges Yihan Lian (Qihoo 360 Gear Team) and Zhibin Hu (Qihoo 360 Gear Team) as the original reporters.

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.

External References

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