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.

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.

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 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.

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)

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.

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.

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.

ID	名稱	產品	系列	已發布	已更新	嚴重性
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
99065	Oracle Linux 6 : tigervnc (ELSA-2017-0630)	Nessus	Oracle Linux Local Security Checks	2017/3/30	2025/12/29	critical
97115	openSUSE Security Update : tigervnc (openSUSE-2017-243)	Nessus	SuSE Local Security Checks	2017/2/13	2026/1/1	high
102293	Oracle Linux 7 : tigervnc / and / fltk (ELSA-2017-2000)	Nessus	Oracle Linux Local Security Checks	2017/8/9	2025/12/2	critical
102658	Scientific Linux Security Update : tigervnc and fltk on SL7.x x86_64 (20170801)	Nessus	Scientific Linux Local Security Checks	2017/8/22	2025/11/26	critical
105757	GLSA-201801-13 : TigerVNC: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2018/1/12	2025/11/6	high
99227	Scientific Linux Security Update : tigervnc on SL6.x i386/x86_64 (20170321)	Nessus	Scientific Linux Local Security Checks	2017/4/6	2025/12/26	critical
97953	CentOS 6 : tigervnc (CESA-2017:0630)	Nessus	CentOS Local Security Checks	2017/3/27	2025/12/29	critical
97598	SUSE SLED12 / SLES12 Security Update : tigervnc (SUSE-SU-2017:0622-1)	Nessus	SuSE Local Security Checks	2017/3/8	2025/12/30	critical

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