Red Hat Bugzilla – Bug 1265785
CVE-2015-7327 Mozilla: Information disclosure via the High Resolution Time API (MFSA 2015-114)
Last modified: 2016-11-08 10:56:16 EST
Security researchers Yossef Oren, Vasileios P. Kemerlis, Simha Sethumadhavan,
Angelos D. Keromytis of Columbia University's Network Security Lab reported a
method of using the High Resolution Time API for side channel attacks. This
the last-level cache over a period of time as a user engages in other browser
activity. This attack takes advantage of the performance.now() API's use of
single nanosecond resolution for timing.
Security researcher Amit Klein independently reported use of the
performance.now() API on Windows systems to extract the Windows counter
frequency as an avenue for side channel attacks.
Both of these flaws allow for the disclosure of private information, user
fingerprinting, and data leakage. They have been addressed by reducing the
resolution of the performance.now()API to 5 microseconds to remove the
precision in resolution available to attackers.
The Windows counter frequency issue does not affect Linux or OS X systems.
Closed by mistake, opening again.
Red Hat would like to thank the Mozilla project for reporting these issues. Upstream acknowledges Yossef Oren, Vasileios P. Kemerlis, Simha Sethumadhavan, and Angelos D. Keromytis of Columbia University's Network Security Lab, and Amit Klein as the original reporters.
This issue was fixed in Firefox version 41.