Security Experts:

cURL Security Audit Reveals Several Vulnerabilities

The latest version of cURL patches nearly a dozen vulnerabilities, more than half of which were discovered as a result of an audit conducted recently by security experts.

cURL is an open source command line tool and library designed for transferring data. cURL is used by thousands of software applications, including networking devices, printers, media equipment, phones, tablets, TVs and even cars.

Daniel Stenberg, lead developer of cURL and Mozilla employee, requested a security audit of cURL from the Mozilla Secure Open Source (SOS) program. The audit was conducted over a 20-day period in August and September by five testers at Germany-based security services provider Cure53.

The audit revealed a total of 23 issues, including nine security flaws. An analysis of the findings by cURL developers led to two of the vulnerabilities being merged and one being classified as a “plain bug” since it involved a very complicated attack scenario.

Of the nine security holes detailed in Cure53’s report, four have been rated “high severity” and four are considered “medium severity.” The high severity issues, which could lead to remote code execution, are tracked as CVE-2016-8617, CVE-2016-8619, CVE-2016-8622 and CVE-2016-8623.

Despite the significant number of flaws, Cure53 concluded that “the overall impression of the state of security and robustness of the cURL library was positive.”

The latest version of cURL, version 7.51.0, patches a total of 11 vulnerabilities. In addition to the seven issues found by Cure53, flaws were also reported by Luật Nguyễn, Christian Heimes and Fernando Muñoz. Stenberg pointed out that before this security audit, the highest number of vulnerabilities fixed in a single release was four.

“I applied for the security audit because I feel that we’ve had some security related issues lately and I’ve had the feeling that we might be missing something so it would be really good to get some experts’ eyes on the code,” Stenberg said in a blog post. “Also, as curl is one of the most used software components in the world a serious problem in curl could have a serious impact on tools, devices and applications everywhere. We don’t want that to happen.”

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Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.