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Test ID:1.3.6.1.4.1.25623.1.0.871851
Category:Red Hat Local Security Checks
Title:RedHat Update for tigervnc and fltk RHSA-2017:2000-01
Summary:The remote host is missing an update for the 'tigervnc and fltk'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'tigervnc and fltk'
package(s) announced via the referenced advisory.

Vulnerability Insight:
Virtual Network Computing (VNC) is a remote
display system which allows users to view a computing desktop environment not
only on the machine where it is running, but from anywhere on the Internet and
from a wide variety of machine architectures. TigerVNC is a suite of VNC servers
and clients which allows users to connect to other desktops running a VNC
server. FLTK (pronounced 'fulltick') is a cross-platform C++ GUI toolkit. It
provides modern GUI functionality without the bloat, and supports 3D graphics
via OpenGL and its built-in GLUT emulation. The following packages have been
upgraded to a later upstream version: tigervnc (1.8.0), fltk (1.3.4).
(BZ#1388620, BZ#1413598) Security Fix(es): * A denial of service flaw was found
in the TigerVNC's Xvnc server. A remote unauthenticated attacker could use this
flaw to make Xvnc crash by terminating the TLS handshake process early.
(CVE-2016-10207) * A double free flaw was found in the way TigerVNC handled
ClientFence messages. A remote, authenticated attacker could use this flaw to
make Xvnc crash by sending specially crafted ClientFence messages, resulting in
denial of service. (CVE-2017-7393) * A missing input sanitization flaw was found
in the way TigerVNC handled credentials. A remote unauthenticated attacker could
use this flaw to make Xvnc crash by sending specially crafted usernames,
resulting in denial of service. (CVE-2017-7394) * An integer overflow flaw was
found in the way TigerVNC handled ClientCutText messages. A remote,
authenticated attacker could use this flaw to make Xvnc crash by sending
specially crafted ClientCutText messages, resulting in denial of service.
(CVE-2017-7395) * A buffer overflow flaw, leading to memory corruption, was
found in TigerVNC viewer. A remote malicious VNC server could use this flaw to
crash the client vncviewer process resulting in denial of service.
(CVE-2017-5581) * A memory leak flaw was found in the way TigerVNC handled
termination of VeNCrypt connections. A remote unauthenticated attacker could
repeatedly send connection requests to the Xvnc server, causing it to consume
large amounts of memory resources over time, and ultimately leading to a denial
of service due to memory exhaustion. (CVE-2017-7392) * A memory leak flaw was
found in the way TigerVNC handled client connections. A remote unauthenticated
attacker could repeatedly send connection requests to the Xvnc server, causing
it to consume large amounts of memory resources over time, and ultimately
leading to a denial of service due to memory exhaustion. (CVE-2017-7396)
Additional Changes: For detailed information on changes in this release, see the
Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

Affected Software/OS:
tigervnc and fltk on Red Hat Enterprise Linux Server (v. 7)

Solution:
Please Install the Updated Packages.

CVSS Score:
6.8

CVSS Vector:
AV:N/AC:M/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2017-5581
BugTraq ID: 95789
http://www.securityfocus.com/bid/95789
https://security.gentoo.org/glsa/201702-19
http://www.openwall.com/lists/oss-security/2017/01/22/1
http://www.openwall.com/lists/oss-security/2017/01/25/6
RedHat Security Advisories: RHSA-2017:0630
http://rhn.redhat.com/errata/RHSA-2017-0630.html
RedHat Security Advisories: RHSA-2017:2000
https://access.redhat.com/errata/RHSA-2017:2000
Common Vulnerability Exposure (CVE) ID: CVE-2017-7392
BugTraq ID: 97305
http://www.securityfocus.com/bid/97305
https://security.gentoo.org/glsa/201801-13
Common Vulnerability Exposure (CVE) ID: CVE-2017-7393
Common Vulnerability Exposure (CVE) ID: CVE-2017-7394
Common Vulnerability Exposure (CVE) ID: CVE-2017-7395
Common Vulnerability Exposure (CVE) ID: CVE-2017-7396
CopyrightCopyright (C) 2017 Greenbone Networks GmbH

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