The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2424-1 advisory.

    Gary Kwong, Randell Jesup, Nils Ohlmeier, Jesse Ruderman, Max Jonas Werner, Christian Holler, Jon     Coppeard, Eric Rahm, Byron Campen, Eric Rescorla, and Xidorn Quan discovered multiple memory safety issues     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 via application crash, or execute arbitrary code     with the privileges of the user invoking Firefox. (CVE-2014-1587, CVE-2014-1588)

    Cody Crews discovered a way to trigger chrome-level XBL bindings from web content in some circumstances.
    If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit     this to bypass security restrictions. (CVE-2014-1589)

    Joe Vennix discovered a crash when using XMLHttpRequest in some circumstances. If a user were tricked in     to opening a specially crafted website, an attacker could potentially exploit this to cause a denial of     service. (CVE-2014-1590)

    Muneaki Nishimura discovered that CSP violation reports did not remove path information in some     circumstances. If a user were tricked in to opening a specially crafted website, an attacker could     potentially exploit this to obtain sensitive information. (CVE-2014-1591)

    Berend-Jan Wever discovered a use-after-free during HTML parsing. If a user were tricked in to opening a     specially crafted website, an attacker could potentially exploit this to cause a denial of service via     application crash or execute arbitrary code with the privileges of the user invoking Firefox.
    (CVE-2014-1592)

    Abhishek Arya discovered a buffer overflow when parsing media content. If a user were tricked in to     opening a specially crafted website, an attacker could potentially exploit this to cause a denial of     service via application crash or execute arbitrary code with the privileges of the user invoking Firefox.
    (CVE-2014-1593)

    Byoungyoung Lee, Chengyu Song, and Taesoo Kim discovered a bad cast in the compositor. If a user were     tricked in to opening a specially crafted website, an attacker could potentially exploit this to cause     undefined behaviour, a denial of service via application crash or execute abitrary code with the     privileges of the user invoking Firefox. (CVE-2014-1594)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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Ubuntu 14.04 LTS : Firefox vulnerabilities (USN-2424-1)

critical Nessus Plugin ID 79688

Version 1.19