Amazon Linux AMI : samba (ALAS-2017-909)
Medium Nessus Plugin ID 103822
SynopsisThe remote Amazon Linux AMI host is missing a security update.
DescriptionServer 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. (CVE-2017-12163)
SMB2 connections don't keep encryption across DFS redirects
A flaw was found in the way samba client used encryption with the max protocol set as SMB3. The connection could lose the requirement for signing and encrypting to any DFS redirects, allowing an attacker to read or alter the contents of the connection via a man-in-the-middle attack. (CVE-2017-12151)
Some code path don't enforce smb signing, when they should
It was found that samba did not enforce 'SMB signing' when certain configuration options were enabled. A remote attacker could launch a man-in-the-middle attack and retrieve information in plain-text.
SolutionRun 'yum update samba' to update your system.