OpenSSL Vulnerable to Side Channel Attack

Wednesday, March 2, 2016 @ 03:03 PM gHale


One of the world’s most common security software packages, OpenSSL, could be vulnerable to a specific form of attack, researchers said.

OpenSSL provides encryption protection for a range of applications on most types of computers and is similar to the encryption packages used by the web browsers Google Chrome (BoringSSL) and Firefox (Mozilla’s Network Security Service (NSS)), according to research led by the University of Adelaide.

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OpenSSL is vulnerable to a type of attack known as a “side channel attack,” according to research by Dr. Yuval Yarom, research Associate at the University of Adelaide’s School of Computer Science, and colleagues Daniel Genkin (Tel Aviv University) and Dr. Nadia Heninger (University of Pennsylvania).

A side channel attack enables a hacker to take important information about software by examining the physical workings of a computer system – such as minute changes in power usage, or observing changes in timing when different software is being used.

Yarom found it is possible to “listen in” to the workings of the OpenSSL encryption software. In the team’s case, they measured highly sensitive changes in the computer’s timing – down to less than one nanosecond (one billionth of a second). From these measurements they recovered the private key which OpenSSL uses to identify the user or the computer.

“In the wrong hands, the private key can be used to ‘break’ the encryption and impersonate the user,” Yarom said.

“At this stage we have only found this vulnerability in computers with Intel’s ‘Sandy Bridge’ processors. Computers with other Intel processors may not be affected in the same way.”

Yarom said the likelihood of someone hacking a computer using this method is slim: “We seem to be the first to have done it, and under controlled conditions.

“Servers, particularly Cloud servers, are a more likely target for this side-channel attack.”

Yarom said there have been debates about this form of attack on OpenSSL for more than 10 years now, with some manufacturers claiming it was not possible. “But we have proven the vulnerability exists,” he said.

“With OpenSSL being the most commonly used cryptographic software in the world right now, it’s important for us to stay vigilant against any possible attack, no matter how small its chances might be.

“Once we discovered the vulnerability, we contacted the developers of OpenSSL and have been helping them to develop a fix for the problem,” he said.