New Telnet hole affects some Unix-based servers

A security hole discovered in a Unix-based operating system can allow remote hackers to gain complete access to or crash the Web server. It is unclear if all Unix mainstream operating systems are affected.

According to an advisory issued earlier this week by FreeBSD.org, the vulnerability in the Telnetd program was shipped with all versions -- except the forthcoming 4.4 release -- of FreeBSD's open-source operating systems built on code developed by Berkeley Software Design Inc. Telnetd is the server for the telnet remote virtual terminal protocol.

Other Unix operating systems built on code from Berkeley Software Design, such as BSDI and NetBSD, are also affected.

According to FreeBSD, the Telnet daemon is enabled by default on all FreeBSD installations and is being actively exploited "in the wild." Telnet is an Internet protocol that allows users to log on to a computer terminal from a remote location.

The vulnerability was discovered by the security group TESO, according to the CERT Coordination Center at Pittsburgh-based Carnegie Mellon University's Software Engineering Institute. In an advisory on its Web site yesterday, CERT said Cisco Systems Inc.'s Internetworking Operating System doesn't appear to be vulnerable. CERT said it's unclear if Hewlett Packard's operating system is affected. In addition, CERT said Sun Microsystems Inc. is investigating and has confirmed that a hacker "can make the in.telnetd daemon dump core, but Sun has not yet determined if this issue can be exploited on Solaris."

Join the PC World newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Linda Rosencrance

Computerworld
Show Comments

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Matthew Stivala

HP OfficeJet 250 Mobile Printer

The HP OfficeJet 250 Mobile Printer is a great device that fits perfectly into my fast paced and mobile lifestyle. My first impression of the printer itself was how incredibly compact and sleek the device was.

Armand Abogado

HP OfficeJet 250 Mobile Printer

Wireless printing from my iPhone was also a handy feature, the whole experience was quick and seamless with no setup requirements - accessed through the default iOS printing menu options.

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?