Example analysis of Samba security vulnerabilities

Today Samba reported another major vulnerability. The vulnerability is currently numbered CVE-2015-0240. An uninitialized pointer in the Samba daemon smbd can be exploited remotely. She can allow a malicious Samba client to send a specific netlogon. The packet thus obtains the permission to run smbd, and the default permission of smbd is still the root super administrator. This vulnerability affects Samba 3.5 and higher versions. Most current GNU/Linux distributions will be affected. Vulnerability analysis by Red Hat Security Team The report has been released.

The current solution to temporarily reduce the risk: add:

rpc_server:netlogon=disabled

in /etc/samba/smb.conf

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