Open Source Code Hacking

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The open source software that the vast majority of organizations include in their critical applications is vulnerable to exploitation from threat actors taking part in its creation. That’s the message from security professionals who point to the nature of open source projects and the ubiquity of the code as a real threat to enterprises.

Once insinuated into an open source project, criminals have a wide range of options, but within a narrow window: “Whether it’s a backdoor keylogger, or Trojan of some sort, it needs to net them something valuable quickly, or they need to do it in a really slick way so they don’t get found out for a while,” says Brad Causey, owner of Zero Day Consulting.

The combination of flexibility and availability makes open source project hacking an opportunity that criminals are willing to sieze. “It’s a pretty well-known attack vector. And I would expect that it’s probably happening more than we’re aware of,” says Chris Eng, chief research officer at Veracode.

Other experts agree. “It’s not only heard of, it’s happening all the time around us. We know of such actions from history and there’s no reason to believe that it’s not still going on,” says Erez Yalon, head of security research for Checkmarx. 

Hackers can ‘poison’ open-source code on the internet

By Adam Conner-Simons |

 August 13, 2021FacebookTwitterEmailShare

Cornell Tech researchers have discovered a new type of online attack that can manipulate natural-language modeling systems and evade any known defense – with possible consequences ranging from modifying movie reviews to manipulating investment banks’ machine-learning models to ignore negative news coverage that would affect a specific company’s stock.

In a new paper, researchers found the implications of these types of hacks – which they call “code poisoning” – to be wide-reaching for everything from algorithmic trading to fake news and propaganda.

“With many companies and programmers using models and codes from open-source sites on the internet, this research shows how important it is to review and verify these materials before integrating them into your current system,” said Eugene Bagdasaryan, a doctoral candidate at Cornell Tech and lead author of “Blind Backdoors in Deep Learning Models,” which was presented Aug. 12 at the virtual USENIX Security ’21 conference. The co-author is Vitaly Shmatikov, professor of computer science at Cornell and Cornell Tech.

“If hackers are able to implement code poisoning,” Bagdasaryan said, “they could manipulate models that automate supply chains and propaganda, as well as resume-screening and toxic comment deletion.”

Without any access to the original code or model, these backdoor attacks can upload malicious code to open-source sites frequently used by many companies and programmers. 

As opposed to adversarial attacks, which require knowledge of the code and model to make modifications, backdoor attacks allow the hacker to have a large impact, without actually having to directly modify the code and models.

“With previous attacks, the attacker must access the model or data during training or deployment, which requires penetrating the victim’s machine learning infrastructure,” Shmatikov said. “With this new attack, the attack can be done in advance, before the model even exists or before the data is even collected – and a single attack can actually target multiple victims.”

The new paper investigates the method for injecting backdoors into machine-learning models, based on compromising the loss-value computation in the model-training code. The team used a sentiment analysis model for the particular task of always classifying as positive all reviews of the infamously bad movies directed by Ed Wood.

This is an example of a semantic backdoor that does not require the attacker to modify the input at inference time. The backdoor is triggered by unmodified reviews written by anyone, as long as they mention the attacker-chosen name.

How can the “poisoners” be stopped? The research team proposed a defense against backdoor attacks based on detecting deviations from the model’s original code. But even then, the defense can still be evaded.

Shmatikov said the work demonstrates that the oft-repeated truism, “Don’t believe everything you find on the internet,” applies just as well to software.

“Because of how popular AI and machine-learning technologies have become, many nonexpert users are building their models using code they barely understand,” he said. “We’ve shown that this can have devastating security consequences.”

For future work, the team plans to explore how code-poisoning connects to summarization and even automating propaganda, which could have larger implications for the future of hacking.

Shmatikov said they will also work to develop robust defenses that “will eliminate this entire class of attacks and make AI and machine learning safe even for nonexpert users.”

This research was supported in part by National Science Foundation grants, the Schmidt Futures program and a Google Faculty Research Award.

Adam Conner-Simons is communications director at Cornell Tech.

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