Menu
RubyGems DNS flaw now patched after second try

RubyGems DNS flaw now patched after second try

Those using the distribution client are advised to patch immediately to version 2.4.8 or higher

RubyGem has released a second fix for a flaw that could be used to substitute a legitimate Ruby program with malware during downloading.

RubyGem has released a second fix for a flaw that could be used to substitute a legitimate Ruby program with malware during downloading.

A revised patch has been released for a flaw in the distribution platform for Ruby applications, RubyGems, which could be used to deliver malware to someone trying to download a program.

RubyGems lets people search for a "gem," which is a packaging format for Ruby applications and code libraries. Ruby developers publish a gem when an application is ready.

Security researchers from Trustwave found a problem with the platform. When people search for a gem, RubyGems uses a DNS (Domain Name System) SRV record request to find a server hosting a particular gem.

The request, however, "does not require that DNS replies come from the same security domain as the original gem source," according to a writeup, which Trustwave plans to release on its blog on Tuesday.

An attacker using the flaw could redirect a RubyGems client to download a gem from a different server and instead supply a malicious program, Trustwave wrote. It then bypasses any SSL/TLS check.

"We wrote a fully functional gem trojaning service that demonstrates how an attacker could simply trojan Ruby gems transparently over the wire while the user was installing them," Trustwave wrote.

Most gems aren't digitally signed, either, so there's no second check to ensure a program is what it purports to be. Some 1.2 million gems are installed a day, so there's a large potential group of victims, according to Trustwave, which also collaborated with OpenDNS to get insight on the number of DNS SRV requests for gems.

RubyGems issued a patch for the flaw in mid-May, but it was incomplete, wrote Jonathan Claudius, lead security researcher at Trustwave, in an email. The organization released a second patch on June 8. The fix validates the SRV record under the original domain, according to a RubyGems blog post.

Trustwave decided to hold off publishing information on the flaw until now to give people time to patch, Claudius said. "Users are slow to fix it," he wrote.

The flaw is CVE-2015-3900, and users should be running version 2.4.8 or greater of RubyGems. Versions between 2.0 and 2.4.6 are vulnerable.

Send news tips and comments to jeremy_kirk@idg.com. Follow me on Twitter: @jeremy_kirk


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags trustwaveExploits / vulnerabilities

Events

Featured

Slideshows

Meet the Reseller News 30 Under 30 Tech Awards 2020 winners

Meet the Reseller News 30 Under 30 Tech Awards 2020 winners

This year’s Reseller News 30 Under 30 Tech Awards were held as an integral part of the first entirely virtual Emerging Leaders​ forum, an annual event dedicated to identifying, educating and showcasing the New Zealand technology market’s rising stars. The 30 Under 30 Tech Awards 2020 recognised the outstanding achievements and business excellence of 30 talented individuals​, across both young leaders and those just starting out. In this slideshow, Reseller News honours this year's winners and captures their thoughts about how their ideas of leadership have changed over time.​

Meet the Reseller News 30 Under 30 Tech Awards 2020 winners
Reseller News Exchange Auckland: Beyond the myths — how partners can master cloud security

Reseller News Exchange Auckland: Beyond the myths — how partners can master cloud security

This exclusive Reseller News Exchange event in Auckland explored the challenges facing the partner community on the cloud security frontier, as well as market trends, customer priorities and how the channel can capitalise on the opportunities available. In association with Arrow, Bitdefender, Exclusive Networks, Fortinet and Palo Alto Networks. Photos by Gino Demeer.

Reseller News Exchange Auckland: Beyond the myths — how partners can master cloud security
Reseller News welcomes industry figures at 2020 Hall of Fame lunch

Reseller News welcomes industry figures at 2020 Hall of Fame lunch

Reseller News welcomed 2019 inductees - Leanne Buer, Ross Jenkins and Terry Dunn - to the fourth running of the Reseller News Hall of Fame lunch, held at the French Cafe in Auckland. The inductees discussed the changing face of the IT channel ecosystem in New Zealand and what it means to be a Reseller News Hall of Fame inductee. Photos by Gino Demeer.

Reseller News welcomes industry figures at 2020 Hall of Fame lunch
Show Comments