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You have always been warned not to share remote access to your computer with untrusted people for any reason—it’s a basic cybersecurity advice, and common sense, right?

But what if, I tell you should not even trust anyone who invites or offer you full remote access to their computers.

A critical vulnerability has been discovered in Microsoft’s Windows Remote Assistance (Quick Assist) feature that affects all versions of Windows to date, including Windows 10, 8.1, RT 8.1, and 7, and allows remote attackers to steal sensitive files on the targeted machine.

Windows Remote Assistance is a built-in tool that allows someone you trust to take over your PC (or you to take remote control of others) so they can help you fix a problem from anywhere around the world.

 

The feature relies on the Remote Desktop Protocol (RDP) to establish a secure connection with the person in need. However, Nabeel Ahmed of Trend Micro Zero Day Initiative discovered and reported an information disclosure vulnerability (CVE-2018-0878) in Windows Remote Assistance that could allow attackers to obtain information to further compromise the victim’s system.

 

The vulnerability, which has been fixed by the company in this month’s Patch Tuesday, resides in the way Windows Remote Assistance processes XML External Entities (XXE). The vulnerability affects Microsoft Windows Server 2016, Windows Server 2012 and R2, Windows Server 2008 SP2 and R2 SP1, Windows 10 (both 32- and 64-bit), Windows 8.1 (both 32- and 64-bit) and RT 8.1, and Windows 7 (both 32- and 64-bit).

 

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Samba maintainers have just released new versions of their networking software to patch two critical vulnerabilities that could allow unprivileged remote attackers to launch DoS attacks against servers and change any other users’ passwords, including admin’s.

Samba is open-source software (re-implementation of SMB networking protocol) that runs on the majority of operating systems available today, including Windows, Linux, UNIX, IBM System 390, and OpenVMS.

Samba allows non-Windows operating systems, like GNU/Linux or Mac OS X, to share network shared folders, files, and printers with Windows operating system.The denial of service vulnerability, assigned CVE-2018-1050, affects all versions of Samba from 4.0.0 onwards and could be exploited “when the RPC spoolss service is configured to be run as an external daemon.”

“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.” Samba advisory says.

The second vulnerability, assigned CVE-2018-1057, allows unprivileged authenticated users to change any other users’ passwords, including admin users, over LDAP.

Password reset flaw exists on all versions of Samba from 4.0.0 onwards, but works only in Samba Active Directory DC implementation, as it doesn’t properly validate permissions of users when they request to modify passwords over LDAP.

A large number of servers might potentially be at risk, because Samba ships with a wide range of Linux distributions.The maintainers of Samba have addressed both vulnerabilities with the release of new Samba versions 4.7.6, 4.6.14, 4.5.16 and have advised administrators to update vulnerable servers immediately.

If you are running an older version of Samba, check for available patches here.

 

The information contained in this website is for general information purposes only. The information is gathered from The Hacker News while we endeavour to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.
Through this website, you are able to link to other websites which are not under the control of CSIRT-CY. We have no control over the nature, content and availability of those sites. The inclusion of any links does not necessarily imply a recommendation or endorse the views expressed within them.
Every effort is made to keep the website up and running smoothly. However, CSIRT-CY takes no responsibility for, and will not be liable for, the website being temporarily unavailable due to technical issues beyond our control.