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We identify class of covert channels in browsers that are not mitigated bycurrent defenses, which we call "pool-party" attacks. Pool-party attacks allowsites to create covert channels by manipulating limited-but-unpartitionedresource pools. These class of attacks have been known, but in this work weshow that they are both more prevalent, more practical for exploitation, andallow exploitation in more ways, than previously identified. These covertchannels have sufficient bandwidth to pass cookies and identifiers across siteboundaries under practical and real-world conditions. We identify pool-partyattacks in all popular browsers, and show they are practical cross-sitetracking techniques (i.e., attacks take 0.6s in Chrome and Edge, and 7s inFirefox and Tor Browser).  In this paper we make the following contributions: first, we describepool-party covert channel attacks that exploit limits in application-layerresource pools in browsers. Second, we demonstrate that pool-party attacks arepractical, and can be used to track users in all popular browsers; we alsoshare open source implementations of the attack and evaluate them through arepresentative web crawl. Third, we show that in Gecko based-browsers(including the Tor Browser) pool-party attacks can also be used forcross-profile tracking (e.g., linking user behavior across normal and privatebrowsing sessions). Finally, we discuss possible mitigation strategies anddefenses

Pool-Party: Exploiting Browser Resource Pools as Side-Channels for Web Tracking