Gentoo Linux Security Advisory 202006-7 - Multiple vulnerabilities have been found in Mozilla Firefox, the worst of which could result in the arbitrary execution of code. Versions less than 68.9.0 are affected.
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Ubuntu Security Notice 4383-1 - Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the addressbar, or execute arbitrary code. It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could potentially exploit this to obtain private keys using a timing attack. Various other issues were also addressed.
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