The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-2000 advisory.

    - Delete underlying ssecurity in SSecurityVeNCrypt [CCVE-2017-7392]       Resolves: bz#1439127       Prevent double free by crafted fences [CVE-2017-7393]       Resolves: bz#1439134
    - Be more restrictive with shared memory mode bits       Resolves: bz#1152552       Limit max username/password size in SSecurityPlain [CVE-2017-7394]       Resolves: bz#1438737       Fix crash from integer overflow in SMsgReader::readClientCutText [CVE-2017-7395]       Resolves: bz#1438742

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-201801-13 (TigerVNC: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in TigerVNC. Please review       the referenced CVE Identifiers for details.
  Impact :

    An attacker could execute arbitrary code or cause a Denial of Service       condition.
  Workaround :

    There is no known workaround at this time.

This update for tigervnc provides the following fixes :

  - Prevent malicious server from crashing a server via a     buffer overflow, a similar flaw as the LibVNCServer     issues CVE-2016-9941 and CVE-2016-9942. (bsc#1019274)

  - CVE-2016-10207: Prevent potential crash due to     insufficient clean-up after failure to establish TLS     connection. (bsc#1023012)

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

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 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)

An update for tigervnc is now available for Red Hat Enterprise Linux 6.

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. The tigervnc packages contain a client which allows users to connect to other desktops running a VNC server.

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 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)

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:2000 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 4.05, has tigervnc packages installed that are affected by multiple vulnerabilities:

  - 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 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)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2017-2026:01 advisory.

    fltk     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.
    tigervnc     Virtual Network Computing (VNC) is a remote display system which     allows you 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.  This package contains a     client which will allow you to connect to other desktops running a VNC     server.
    CVE-2016-10207     Adobe Flash Player before 18.0.0.343 and 19.x through 21.x before     21.0.0.213 on Windows and OS X and before 11.2.202.616 on Linux allows     attackers to execute arbitrary code or cause a denial of service     (memory corruption) via unspecified vectors, a different vulnerability     than CVE-2016-1012, CVE-2016-1021, CVE-2016-1022, CVE-2016-1023,     CVE-2016-1024, CVE-2016-1025, CVE-2016-1026, CVE-2016-1027,     CVE-2016-1028, CVE-2016-1029, CVE-2016-1032, and CVE-2016-1033.
    CVE-2017-5581     Buffer overflow in the ModifiablePixelBuffer::fillRect function in     TigerVNC before 1.7.1 allows remote servers to execute arbitrary code     via an RRE message with subrectangle outside framebuffer boundaries.
    CVE-2017-7392     In TigerVNC 1.7.1 (SSecurityVeNCrypt.cxx     SSecurityVeNCrypt::SSecurityVeNCrypt), an unauthenticated client can     cause a small memory leak in the server.
    CVE-2017-7393     In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an     authenticated client can cause a double free, leading to denial of     service or potentially code execution.
    CVE-2017-7394     In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg),     unauthenticated users can crash the server by sending long usernames.
    CVE-2017-7395     In TigerVNC 1.7.1 (SMsgReader.cxx SMsgReader::readClientCutText), by     causing an integer overflow, an authenticated client can crash the     server.
    CVE-2017-7396     In TigerVNC 1.7.1 (CConnection.cxx CConnection::CConnection), an     unauthenticated client can cause a small memory leak in the server.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
102293	Oracle Linux 7 : tigervnc / and / fltk (ELSA-2017-2000)	Nessus	Oracle Linux Local Security Checks	8/9/2017	12/2/2025	critical
105757	GLSA-201801-13 : TigerVNC: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	1/12/2018	11/6/2025	high
97598	SUSE SLED12 / SLES12 Security Update : tigervnc (SUSE-SU-2017:0622-1)	Nessus	SuSE Local Security Checks	3/8/2017	12/30/2025	critical
99227	Scientific Linux Security Update : tigervnc on SL6.x i386/x86_64 (20170321)	Nessus	Scientific Linux Local Security Checks	4/6/2017	12/26/2025	critical
97953	CentOS 6 : tigervnc (CESA-2017:0630)	Nessus	CentOS Local Security Checks	3/27/2017	12/29/2025	critical
102109	RHEL 7 : tigervnc and fltk (RHSA-2017:2000)	Nessus	Red Hat Local Security Checks	8/2/2017	12/4/2025	critical
127339	NewStart CGSL MAIN 4.05 : tigervnc Multiple Vulnerabilities (NS-SA-2019-0106)	Nessus	NewStart CGSL Local Security Checks	8/12/2019	5/7/2024	critical
288894	MiracleLinux 7 : fltk-1.3.4-1.el7, tigervnc-1.8.0-1.el7 (AXSA:2017-2026:01)	Nessus	Miracle Linux Local Security Checks	1/16/2026	1/16/2026	critical
97876	RHEL 6 : tigervnc (RHSA-2017:0630)	Nessus	Red Hat Local Security Checks	3/22/2017	12/29/2025	critical

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