Risk
4/12/2012
09:59 AM
50%
50%

Samba Patch: Linux Users Should Apply Immediately

Dangerous vulnerability in a pervasive tool for running Linux systems in a Windows environment opens door for an attacker to access systems without requiring any authentication.

A dangerous vulnerability in a pervasive tool for running Linux systems in a Windows environment leaves the door open for an attacker to access these systems without requiring any authentication.

The open-source Samba group this week released an update to the Samba program to fix a bug that could allow an attacker to remotely acquire root access to the targeted server. The bug in Samba versions 3.6.3 and previous versions is a buffer overflow flaw in Samba's remote procedure call code. "As this does not require an authenticated connection, it is the most serious vulnerability possible in a program, and users and vendors are encouraged to patch their Samba installations immediately," according to a newly issued advisory from Samba on the new CVE-2012-1182 vulnerability, which includes links to patches for the software.

Nicholas Percoco, senior VP and head of Trustwave SpiderLabs, says the flaw affects anyone who has embedded Linux-based appliances that use Samba for file sharing, such as network-attached storage (NAS), print servers, and printers. While these devices tend to run in an intranet rather than over the big Internet, the main risk would be from a sophisticated targeted attack or a malicious insider, he says.

"This is a very critical patch you should be applying ... if an attacker gets root access, it's game over from a security perspective," Percoco says. "You should not be running Samba [systems] on the Internet. That being said, it doesn't mean people aren't."

A proof-of-concept is circulating, and Percoco says the vulnerability is prime for abuse as a network worm, as well as for a targeted attack. "It can also be the perfect storm for a Unix-based worm. This is something like the Nimda For Linux/Unix," he says.

But most at risk here is the compromise of Linux-embedded systems that use Samba, and many of these device vendors are notorious for not regularly patching these systems. "Some have firmware that you can have updated. So contact the vendor to see if they have updated firmware for this," Percoco says. "If not, you have to weigh the risk. If you're risk-averse, you may have to unplug or replace these devices."

Many devices won't ever be fixed, Percoco and other security experts say.

Read the rest of this article on Dark Reading.

Most external hacks of databases occur because of flaws in Web applications that link to those databases. In this report, Protecting Databases From Web Applications, we'll discuss how security teams, database administrators, and application developers can work together to improve the defenses of both front-end Web applications and back-end databases to prevent these attacks from succeeding. (Free registration required.)

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: just wondering...Thanx
Current Issue
Security Operations and IT Operations: Finding the Path to Collaboration
A wide gulf has emerged between SOC and NOC teams that's keeping both of them from assuring the confidentiality, integrity, and availability of IT systems. Here's how experts think it should be bridged.
Flash Poll
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2017-0290
Published: 2017-05-09
NScript in mpengine in Microsoft Malware Protection Engine with Engine Version before 1.1.13704.0, as used in Windows Defender and other products, allows remote attackers to execute arbitrary code or cause a denial of service (type confusion and application crash) via crafted JavaScript code within ...

CVE-2016-10369
Published: 2017-05-08
unixsocket.c in lxterminal through 0.3.0 insecurely uses /tmp for a socket file, allowing a local user to cause a denial of service (preventing terminal launch), or possibly have other impact (bypassing terminal access control).

CVE-2016-8202
Published: 2017-05-08
A privilege escalation vulnerability in Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) releases earlier than v7.4.1d and v8.0.1b could allow an authenticated attacker to elevate the privileges of user accounts accessing the system via command line interface. With affected version...

CVE-2016-8209
Published: 2017-05-08
Improper checks for unusual or exceptional conditions in Brocade NetIron 05.8.00 and later releases up to and including 06.1.00, when the Management Module is continuously scanned on port 22, may allow attackers to cause a denial of service (crash and reload) of the management module.

CVE-2017-0890
Published: 2017-05-08
Nextcloud Server before 11.0.3 is vulnerable to an inadequate escaping leading to a XSS vulnerability in the search module. To be exploitable a user has to write or paste malicious content into the search dialogue.

Dark Reading Radio
Archived Dark Reading Radio
In past years, security researchers have discovered ways to hack cars, medical devices, automated teller machines, and many other targets. Dark Reading Executive Editor Kelly Jackson Higgins hosts researcher Samy Kamkar and Levi Gundert, vice president of threat intelligence at Recorded Future, to discuss some of 2016's most unusual and creative hacks by white hats, and what these new vulnerabilities might mean for the coming year.