Scientific Linux Security Update : tigervnc and fltk on SL7.x x86_64

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

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).

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)

See also :

http://www.nessus.org/u?a7ec1ab5

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 102658 ()

Bugtraq ID:

CVE ID: CVE-2016-10207
CVE-2017-5581
CVE-2017-7392
CVE-2017-7393
CVE-2017-7394
CVE-2017-7395
CVE-2017-7396

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