Ubuntu 12.04 LTS : firefox vulnerabilities (USN-2656-2) (Logjam)

Ubuntu Security Notice (C) 2015-2016 Canonical, Inc. / NASL script (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

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

Description :

USN-2656-1 fixed vulnerabilities in Firefox for Ubuntu 14.04 LTS and
later releases.

This update provides the corresponding update for Ubuntu 12.04 LTS.

Karthikeyan Bhargavan discovered that NSS incorrectly handled state
transitions for the TLS state machine. If a remote attacker were able
to perform a man-in-the-middle attack, this flaw could be exploited to
skip the ServerKeyExchange message and remove the forward-secrecy
property. (CVE-2015-2721)

Looben Yan discovered 2 use-after-free issues when using
XMLHttpRequest in some circumstances. 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-2015-2722,
CVE-2015-2733)

Bob Clary, Christian Holler, Bobby Holley, Andrew McCreight,
Terrence Cole, Steve Fink, Mats Palmgren, Wes Kocher,
Andreas Pehrson, Tooru Fujisawa, Andrew Sutherland, and Gary
Kwong 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-2015-2724, CVE-2015-2725, CVE-2015-2726)

Armin Razmdjou discovered that opening hyperlinks with
specific mouse and key combinations could allow a Chrome
privileged URL to be opened without context restrictions
being preserved. If a user were tricked in to opening a
specially crafted website, an attacker could potentially
exploit this to bypass security restrictions.
(CVE-2015-2727)

Paul Bandha discovered a type confusion bug in the Indexed
DB Manager. 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 priviliges of the user
invoking Firefox. (CVE-2015-2728)

Holger Fuhrmannek discovered an out-of-bounds read in Web
Audio. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this
to obtain sensitive information. (CVE-2015-2729)

Watson Ladd discovered that NSS incorrectly handled
Elliptical Curve Cryptography (ECC) multiplication. A remote
attacker could possibly use this issue to spoof ECDSA
signatures. (CVE-2015-2730)

A use-after-free was discovered when a Content Policy
modifies the DOM to remove a DOM object. 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 priviliges of the user invoking Firefox. (CVE-2015-2731)

Ronald Crane discovered multiple security vulnerabilities.
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-2015-2734, CVE-2015-2735, CVE-2015-2736,
CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740)

David Keeler discovered that key pinning checks can be
skipped when an overridable certificate error occurs. This
allows a user to manually override an error for a fake
certificate, but cannot be exploited on its own.
(CVE-2015-2741)

Jonas Jenwald discovered that some internal workers were
incorrectly executed with a high privilege. If a user were
tricked in to opening a specially crafted website, an
attacker could potentially exploit this in combination with
another security vulnerability, to execute arbitrary code in
a privileged scope. (CVE-2015-2743)

Matthew Green discovered a DHE key processing issue in NSS
where a MITM could force a server to downgrade TLS
connections to 512-bit export-grade cryptography. An
attacker could potentially exploit this to impersonate the
server. (CVE-2015-4000).

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 :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

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