Hyundai Blue Link Application Software Potentially Expose Sensitive Information

Discoverer at Rapid7 have told that they have discovered a serious problem in the application Blue Link, Hyundai is the company develops for its cars since 2012.

Due to a reliance on cleartext communications and the use of a hard-coded decryption password, two outdated versions of Hyundai Blue Link application software, 3.9.4 and 3.9.5 potentially expose sensitive information about registered users and their vehicles, including application usernames, passwords, and PINs via a log transmission feature. This feature was introduced in version 3.9.4 on December 8, 2016, and removed by Hyundai on March 6, 2017 with the release of version 3.9.6.


Affected versions of Hyundai Blue Link mobile application upload application logs to a static IP address over HTTP on port 8080. The log is encrypted using a symmetrical key, "1986l12Ov09e", which is defined in the Blue Link application (specifically, C1951e.java), and cannot be modified by the user.

This vulnerability was discovered by Will Hatzer and Arjun Kumar, and this advisory was prepared in accordance with Rapid7's

Hyundai Motor America (HMA) was made aware of a vulnerability in the Hyundai Blue Link mobile application by researchers at Rapid7. Upon learning of this vulnerability, HMA launched an investigation to validate the research and took immediate steps to further secure the application. HMA is not aware of any customers being impacted by this potential vulnerability.