Oracle Linux 7 : fltk / tigervnc (ELSA-2017-2000)

2017-08-09T00:00:00
ID ORACLELINUX_ELSA-2017-2000.NASL
Type nessus
Reporter Tenable
Modified 2018-07-25T00:00:00

Description

From Red Hat Security Advisory 2017:2000 :

An update for tigervnc and fltk is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2017:2000 and 
# Oracle Linux Security Advisory ELSA-2017-2000 respectively.
#

if (NASL_LEVEL < 3000) exit(0);

include("compat.inc");

if (description)
{
  script_id(102293);
  script_version("3.3");
  script_cvs_date("Date: 2018/07/25 14:27:30");

  script_cve_id("CVE-2016-10207", "CVE-2017-5581", "CVE-2017-7392", "CVE-2017-7393", "CVE-2017-7394", "CVE-2017-7395", "CVE-2017-7396");
  script_xref(name:"RHSA", value:"2017:2000");

  script_name(english:"Oracle Linux 7 : fltk / tigervnc (ELSA-2017-2000)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Oracle Linux host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"From Red Hat Security Advisory 2017:2000 :

An update for tigervnc and fltk is now available for Red Hat
Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://oss.oracle.com/pipermail/el-errata/2017-August/007086.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected fltk and / or tigervnc packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:fltk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:fltk-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:fltk-fluid");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:fltk-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc-icons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc-server-applet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc-server-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tigervnc-server-module");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/09");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Oracle Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/OracleLinux")) audit(AUDIT_OS_NOT, "Oracle Linux");
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !eregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, "Oracle Linux");
os_ver = eregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Oracle Linux");
os_ver = os_ver[1];
if (! ereg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Oracle Linux 7", "Oracle Linux " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Oracle Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"fltk-1.3.4-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"fltk-devel-1.3.4-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"fltk-fluid-1.3.4-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"fltk-static-1.3.4-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-1.8.0-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-icons-1.8.0-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-license-1.8.0-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-server-1.8.0-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-server-applet-1.8.0-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-server-minimal-1.8.0-1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"tigervnc-server-module-1.8.0-1.el7")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fltk / fltk-devel / fltk-fluid / fltk-static / tigervnc / etc");
}