Safari AutoFill Security Issue Rears Its Head Once Again

Back in July, security researcher Jeremiah Grossman revealed a security issue that could allow malicious parties to take advantage of Safari's AutoFill feature to extract personal information from users' Address Book entries. At the time, Grossman reported that his report to Apple had gone essentially unacknowledged for nearly a month, but just six days later Apple released Safari 5.0.1 and 4.1.1 to address the problem.

134256 safari autofill u tab exploit 500
Screenshot of Grossman's proof-of-concept test of new AutoFill exploit

Grossman now reports that he has discovered another similar AutoFill security issue that, while requiring the malicious party to trick users into providing a pair of keystrokes rather than being completely automated as in the previous exploit, offers an even more efficient means for users' personal information to be obtained.

To perform our attack requires tiny bit of end-user trickery. Two button presses to be precise. A malicious website detects (ie: IP address) the country the victim is from. For our purposes here we'll assume the "US." The attacker invisibly (CSS transparency) sets up the aforementioned form and forces the keystroke focus into the country element. Notice how this is done in the video on the right side of the screen, which only visible for demonstration purposes. Next the attacker entices the victim to type "U" (first character of "US") and then press "TAB." And BAM! That's it! Data stolen.

Grossman relates that he notified Apple of the newly-discovered exploit via email on August 10th and again a few days later. One week after that, he received a phone call from an Apple product security engineer with whom he had a "productive chat" about how the original vulnerability report from June had been handled, only to discover at the end of the conversation that the engineer had no idea that Grossman had reported the second issue a week and half prior.

As with the earlier exploit, users can protect themselves by simply turning off the AutoFill option to automatically populate forms with information from their Address Book cards. Grossman notes, however, that he is unsure how Apple plans to address the vulnerability while still maintaining the convenience of the AutoFill feature. While Apple's previous patch allowed Safari to automatically differentiate from the automated JavaScript-simulated keystrokes from real keystrokes, thus thwarting the original exploit, the new exploit relies on tricking the user into actually entering the necessary keystroke, a tactic that could be more difficult to address.

Popular Stories

iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro Coming Soon With These 14 New Features

Friday July 4, 2025 1:05 pm PDT by
Apple's next-generation iPhone 17 Pro and iPhone 17 Pro Max are just over two months away, and there are plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models. Latest Rumors These rumors surfaced in June and July:Apple logo repositioned: Apple's logo may have a lower position on the back of the iPhone 17 Pro models, compared to previous...
iphone 16 pro models 1

Here's How the iPhone 17 Pro Max Will Compare to the iPhone 17 Pro

Saturday July 5, 2025 1:00 pm PDT by
Apple should unveil the iPhone 17 series in September, and there might be one bigger difference between the Pro and Pro Max models this year. As always, the Pro Max model will be larger than the Pro model:iPhone 17 Pro: 6.3-inch display iPhone 17 Pro Max: 6.9-inch displayGiven the Pro Max is physically larger than the Pro, it has more internal space, allowing for a larger battery and...
airpods pro 2

AirPods Pro 3 to Help Maintain Apple's Place in Earbud Market Amid Increasing Low-Cost Competition

Thursday July 3, 2025 7:25 am PDT by
Apple's position as the dominant force in the global true wireless stereo (TWS) earbud market is expected to continue through 2025, according to Counterpoint Research. The forecast outlines a 3% year-over-year increase in global TWS unit shipments for 2025, signaling a transition from rapid growth to a more mature phase for the category. While Apple is set to remain the leading brand by...
iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro Max Battery Capacity Leaked

Thursday July 3, 2025 5:40 am PDT by
The iPhone 17 Pro Max will feature the biggest ever battery in an iPhone, according to the Weibo leaker known as "Instant Digital." In a new post, the leaker listed the battery capacities of the iPhone 11 Pro Max through to the iPhone 16 Pro Max, and added that the iPhone 17 Pro Max will feature a battery capacity of 5,000mAh: iPhone 11 Pro Max: 3,969mAh iPhone 12 Pro Max: 3,687mAh...
Apple Watch Ultra Night Mode Screen

Apple Watch Ultra 3 Launching Later This Year With Two Key Upgrades

Wednesday July 2, 2025 1:13 pm PDT by
The long wait for an Apple Watch Ultra 3 appears to be nearly over, and it is rumored to feature both satellite connectivity and 5G support. Apple Watch Ultra's existing Night Mode In his latest Power On newsletter, Bloomberg's Mark Gurman said that the Apple Watch Ultra 3 is on track to launch this year with "significant" new features, including satellite connectivity, which would let you...
apple silicon mac lineup 2024 feature purple m5

Apple's Upcoming Macs Listed in New Report

Thursday July 3, 2025 9:09 am PDT by
AppleInsider's Marko Zivkovic today shared a list of alleged identifiers for future Mac models, which should roll out over the next year or so. The report does not reveal anything too surprising, but it does serve as further evidence that Apple is seemingly working on new models of every Mac, including the MacBook Air, MacBook Pro, iMac, Mac mini, Mac Studio, and Mac Pro. Apple is...
Future M5 Chip Devices

M5 Chip Rumored to Debut in These Five Apple Products Later This Year

Friday July 4, 2025 9:14 am PDT by
Apple's next-generation M5 chip is expected to debut in five new products later this year, including the iPad Pro, Vision Pro, MacBook Pro, Mac mini, and iMac. M5 chips will reportedly be manufactured with TSMC's latest third-generation 3nm process, which should result in slight performance and power efficiency improvements over M4 chips fabricated with its second-generation 3nm process. ...