Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : firefox regression (USN-3435-2)

Ubuntu Security Notice (C) 2017 Canonical, Inc. / NASL script (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

USN-3435-1 fixed vulnerabilities in Firefox. The update caused the
Flash plugin to crash in some circumstances. This update fixes the
problem.

We apologize for the inconvenience.

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 read uninitialized memory, obtain
sensitive information, bypass phishing and malware protection, spoof
the origin in modal dialogs, conduct cross-site scripting (XSS)
attacks, cause a denial of service via application crash, or execute
arbitrary code. (CVE-2017-7793, CVE-2017-7810, CVE-2017-7811,
CVE-2017-7812, CVE-2017-7813, CVE-2017-7814, CVE-2017-7815,
CVE-2017-7818, CVE-2017-7819, CVE-2017-7820, CVE-2017-7822,
CVE-2017-7823, CVE-2017-7824)

Martin Thomson discovered that NSS incorrectly generated
handshake hashes. A remote attacker could potentially
exploit this to cause a denial of service via application
crash, or execute arbitrary code. (CVE-2017-7805)

Multiple security issues were discovered in WebExtensions.
If a user were tricked in to installing a specially crafted
extension, an attacker could potentially exploit these to
download and open non-executable files without interaction,
or obtain elevated privileges. (CVE-2017-7816,
CVE-2017-7821).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected firefox package.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.9
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

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