Maintainers at the Samba project have released new versions of the popular networking software to fix two critical vulnerabilities.
Maintainers at the Samba project have released new versions of the popular open-source networking software to address two critical vulnerabilities that could be exploited by unprivileged remote attackers to launch DoS attacks against servers and change any users’ passwords, including administrators ‘ones.
Samba has provided secure and fast file and print services for all clients using the SMB/CIFS protocol, it allows non-Windows operating systems, like GNU/Linux or Mac OS X, to share network shared folders, files, and printers with Windows OS.
The maintainers of Samba have addressed the vulnerabilities with the release of the Samba versions 4.7.6, 4.6.14, 4.5.16.
The first DoS vulnerability tracked as CVE-2018-1050 could be exploited “when the RPC spoolss service is configured to be run as an external daemon.”
The vulnerability is caused by the lack of input sanitizations checks on some parameters and affects all versions of Samba from 4.0.0 onwards.
“Missing input sanitization checks on some of the input parameters to spoolss RPC calls could cause the print spooler service to crash. If the RPC spoolss service is left by default as an internal service, all a client can do is crash its own authenticated connection.” reads the security advisory.
A second flaw, tracked CVE-2018-1057, could be exploited by unprivileged authenticated users to change any other users’ passwords, including admin users, over LDAP. Samba doesn’t properly validate permissions of users when they request to modify passwords over LDAP.
The flaw only impacts on the Samba Active Directory DC, all versions of Samba’s AD DC and pre-release versions since Samba 4.0.0alpha13 are affected by this vulnerability.
Administrators need to update vulnerable servers immediately; further details have been published on the “Samba Security Releases” page.
Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines.
Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.