Outdated Git version in OS X puts developers at risk

The Git version shipped with Apple's command line developer tools is vulnerable to remote code execution attacks

The OS X command line developer tools include an old version of the Git source code management system that exposes Mac users to remote code execution attacks.

The Git client allows developers to interact with source code repositories. It is not installed by default on Mac OS X, but it is included in the Command Line Tools package for Xcode, Apple's integrated development environment (IDE).

Software developers who create applications for OS X or iOS are likely to use Xcode and to have Apple's Command Line Tools package installed on their Macs. The latest version of this package includes Git version 2.6.4, released in December.

The problem is that Git 2.6.4 has two serious vulnerabilities that were publicly disclosed last month. The flaws, tracked as CVE-2016-2315 and CVE-2016-2324, affect both client and server deployments on Git. On the client side, they could lead to remote code execution when cloning a repository with a large filename or a large number of nested trees.

The vulnerabilities were fixed in Git 2.7.4, released on March 17, but one month later Apple still hasn't released an update to its Command Line Tools package.

Even worse, since the Git binary is installed as a system-level program, on OS X El Capitan (10.11) users can't easily replace or update it themselves, according to systems administration expert Rachel Kroll. That's because Apple's latest OS X version includes System Integrity Protection (SIP), a mechanism that prevents modifying programs in certain protected directories like /usr and /bin, even with root privileges.

"Maybe you want to be clever and protect your users by disabling it until you can figure something else out," Kroll said in a blog post. "Well, sorry. You also can't 'chmod -x' to at least keep it from being used. It will also fail."

Fortunately, there is a workaround, because /usr/bin/git is just a clever link to /Applications/Xcode.app/Contents/Developer/usr/bin, which can be modified. Running "chmod -x" on the latter binary will remove its execution privileges and ensure that no users or programs accidentally run it.

Then you have to wait until Apple releases a patched version as part of a future Command Line Tools package. However, Git is important for development tools and preventing its use could affect workflows.

Apple did not immediately respond to an inquiry about its plans of patching the Git binary that the company distributes.

"If you rely on machines like this, I am truly sorry," Kroll said. "I feel for you."

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.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Lucian Constantin

IDG News Service
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?