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.

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.

According to the versions of the tigervnc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

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

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2017-1376:01 advisory.

    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.
    Security issues fixed with this release:
    CVE-2016-10207     The Xvnc server in TigerVNC allows remote attackers to cause a denial     of service (invalid memory access and crash) by terminating a TLS     handshake early.
    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.
    Additional Changes:

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.

This update for tigervnc fixes the following issues :

This security issue was fixed :

  - CVE-2016-10207: Prevent crash caused by failed TLS     connection (bnc#1023012)

This non-security issue was fixed :

  - Fix random client disconnections (boo#1022432)

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-0630 advisory.

    [1.1.0-24]
    - Proper global init/deinit of GnuTLS       Resolves: bz#1418946

    [1.1.0-23]
    - Fix buffer overflow in FullFramePixelBuffer::fillRect       Resolves: bz#1416289

    [1.1.0-22]
    - Fix buffer overflow in FullFramePixelBuffer::fillRect       Resolves: bz#1416289

    [1.1.0-21]
    - Enable DRI2 and DRI3       Resolves: bz#1323065

    [1.1.0-20]
    - Rebuild against fixed xorg-x11-server to avoid automatical disconnects       when initiazed from xinetd       Resolves: bz#1390458

    [1.1.0-19]
    - Restore default behaviour to listen on TCP       Resolves: bz#1378922

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
102109	RHEL 7 : tigervnc and fltk (RHSA-2017:2000)	Nessus	Red Hat Local Security Checks	2017/8/2	2025/12/4	critical
127339	NewStart CGSL MAIN 4.05 : tigervnc Multiple Vulnerabilities (NS-SA-2019-0106)	Nessus	NewStart CGSL Local Security Checks	2019/8/12	2024/5/7	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	2026/1/16	2026/1/16	critical
97876	RHEL 6 : tigervnc (RHSA-2017:0630)	Nessus	Red Hat Local Security Checks	2017/3/22	2025/12/29	critical
103085	EulerOS 2.0 SP1 : tigervnc (EulerOS-SA-2017-1227)	Nessus	Huawei Local Security Checks	2017/9/11	2025/11/24	critical
103086	EulerOS 2.0 SP2 : tigervnc (EulerOS-SA-2017-1228)	Nessus	Huawei Local Security Checks	2017/9/11	2025/11/24	critical
289024	MiracleLinux 4 : tigervnc-1.1.0-24.AXS4 (AXSA:2017-1376:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
97115	openSUSE Security Update : tigervnc (openSUSE-2017-243)	Nessus	SuSE Local Security Checks	2017/2/13	2026/1/1	high
99065	Oracle Linux 6 : tigervnc (ELSA-2017-0630)	Nessus	Oracle Linux Local Security Checks	2017/3/30	2025/12/29	critical

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