Samba 3.5.x < 4.4 / 4.4.x < 4.4.14 / 4.5.x < 4.5.10 / 4.6.x < 4.6.4 Shared Library RCE
critical Nessus Plugin ID 100388
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Synopsis
The remote Samba server is affected by a remote code execution vulnerability.Description
The version of Samba running on the remote host is 3.5.x prior to 4.4.x, or it is 4.4.x prior to 4.4.14, 4.5.x prior to 4.5.10, or 4.6.x prior to 4.6.4. It is, therefore, affected by an unspecified remote code execution vulnerability. An authenticated, remote attacker can exploit this, via a specially crafted shared library uploaded to a writable share, to cause the server to load and execute arbitrary code with root privileges.Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Samba version 4.4.14 / 4.5.10 / 4.6.4 or later.Alternatively, add the parameter 'nt pipe support = no' to the [global] section of the smb.conf and restart smbd. This prevents clients from accessing any named pipe endpoints. Note that this workaround can disable some expected functionality for Windows clients.
See Also
https://www.samba.org/samba/security/CVE-2017-7494.html
https://www.samba.org/samba/history/samba-4.4.14.html
Plugin Details
Severity: Critical
ID: 100388
File Name: samba_4_6_4.nasl
Version: 1.14
Type: remote
Family: Misc.
Published: 5/24/2017
Updated: 11/13/2019
Dependencies: smb_nativelanman.nasl
Configuration: Enable paranoid mode
Risk Information
CVSS Score Source: CVE-2017-7494
VPR
Risk Factor: Critical
Score: 9.6
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 8.3
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal Vector: E:F/RL:OF/RC:C
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 9.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: E:F/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:samba:samba
Required KB Items: SMB/NativeLanManager, SMB/samba, Settings/ParanoidReport
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 5/24/2017
Vulnerability Publication Date: 5/24/2017
Exploitable With
CANVAS (CANVAS)
Core Impact
Metasploit (Samba is_known_pipename() Arbitrary Module Load)
Reference Information
CVE: CVE-2017-7494
BID: 98636