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

  - An issue was discovered in LibVNCServer before 0.9.13.
    There is an information leak (of uninitialized memory     contents) in the libvncclient/rfbproto.c     ConnectToRFBRepeater function.(CVE-2018-21247)

  - libvncclient/sockets.c in LibVNCServer before 0.9.13     has a buffer overflow via a long socket     filename.(CVE-2019-20839)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/rfbregion.c has a NULL pointer     dereference.(CVE-2020-14397)

  - An issue was discovered in LibVNCServer before 0.9.13.
    An improperly closed TCP connection causes an infinite     loop in libvncclient/sockets.c.(CVE-2020-14398)

  - An issue was discovered in LibVNCServer before 0.9.13.
    Byte-aligned data is accessed through uint32_t pointers     in libvncclient/rfbproto.c.(CVE-2020-14399)

  - An issue was discovered in LibVNCServer before 0.9.13.
    Byte-aligned data is accessed through uint16_t pointers     in libvncserver/translate.c.(CVE-2020-14400)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/scale.c has a pixel_value integer     overflow.(CVE-2020-14401)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/corre.c allows out-of-bounds access via     encodings.(CVE-2020-14402)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/hextile.c allows out-of-bounds access via     encodings.(CVE-2020-14403)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/rre.c allows out-of-bounds access via     encodings.(CVE-2020-14404)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncclient/rfbproto.c does not limit TextChat     size.(CVE-2020-14405)

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 Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4573-1 advisory.

    Nicolas Ruff discovered that Vino incorrectly handled large ClientCutText messages. A remote attacker     could use this issue to cause the server to crash, resulting in a denial of service. (CVE-2014-6053)

    It was discovered that Vino incorrectly handled certain packet lengths. A remote attacker could possibly     use this issue to obtain sensitive information, cause a denial of service, or execute arbitrary code.
    (CVE-2018-7225)

    Pavel Cheremushkin discovered that an information disclosure vulnerability existed in Vino when sending a     ServerCutText message. An attacker could possibly use this issue to expose sensitive information.
    (CVE-2019-15681)

    It was discovered that Vino incorrectly handled region clipping. A remote attacker could possibly use this     issue to cause Vino to crash, resulting in a denial of service. (CVE-2020-14397)

    It was discovered that Vino incorrectly handled encodings. A remote attacker could use this issue to cause     Vino to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402,     CVE-2020-14403, CVE-2020-14404)

Tenable has extracted the preceding description block directly from the Ubuntu 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 MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2021-2098:01 advisory.

    * libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
      * libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
      * libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
      * libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
      * libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1811 advisory.

    LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.

    Security Fix(es):

    * libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)

    * libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)

    * libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)

    * libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)

    * libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 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.

This update for LibVNCServer fixes the following issues :

  - security update

  - added patches fix CVE-2018-21247 [bsc#1173874],     uninitialized memory contents are vulnerable to     Information leak

  + LibVNCServer-CVE-2018-21247.patch fix CVE-2019-20839     [bsc#1173875], buffer overflow in     ConnectClientToUnixSock()

  + LibVNCServer-CVE-2019-20839.patch fix CVE-2019-20840     [bsc#1173876], unaligned accesses in hybiReadAndDecode     can lead to denial of service

  + LibVNCServer-CVE-2019-20840.patch fix CVE-2020-14398     [bsc#1173880], improperly closed TCP connection causes     an infinite loop in libvncclient/sockets.c

  + LibVNCServer-CVE-2020-14398.patch fix CVE-2020-14397     [bsc#1173700], NULL pointer dereference in     libvncserver/rfbregion.c

  + LibVNCServer-CVE-2020-14397.patch fix CVE-2020-14399     [bsc#1173743], Byte-aligned data is accessed through     uint32_t pointers in libvncclient/rfbproto.c.

  + LibVNCServer-CVE-2020-14399.patch fix CVE-2020-14400     [bsc#1173691], Byte-aligned data is accessed through     uint16_t pointers in libvncserver/translate.c.

  + LibVNCServer-CVE-2020-14400.patch fix CVE-2020-14401     [bsc#1173694], potential integer overflows in     libvncserver/scale.c

  + LibVNCServer-CVE-2020-14401.patch fix CVE-2020-14402     [bsc#1173701], out-of-bounds access via encodings.

  + LibVNCServer-CVE-2020-14402,14403,14404.patch fix     CVE-2017-18922 [bsc#1173477], preauth buffer overwrite

This update was imported from the SUSE:SLE-15:Update update project.

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

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/hextile.c allows out-of-bounds access via     encodings.(CVE-2020-14403)

  - An issue was discovered in LibVNCServer before 0.9.13.
    An improperly closed TCP connection causes an infinite     loop in libvncclient/sockets.c.(CVE-2020-14398)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/scale.c has a pixel_value integer     overflow.(CVE-2020-14401)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/corre.c allows out-of-bounds access via     encodings.(CVE-2020-14402)

  - An issue was discovered in LibVNCServer before 0.9.13.
    Byte-aligned data is accessed through uint16_t pointers     in libvncserver/translate.c.(CVE-2020-14400)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/rre.c allows out-of-bounds access via     encodings.(CVE-2020-14404)

  - An issue was discovered in LibVNCServer before 0.9.13.
    There is an information leak (of uninitialized memory     contents) in the libvncclient/rfbproto.c     ConnectToRFBRepeater function.(CVE-2018-21247)

  - libvncclient/sockets.c in LibVNCServer before 0.9.13     has a buffer overflow via a long socket     filename.(CVE-2019-20839)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncclient/rfbproto.c does not limit TextChat     size.(CVE-2020-14405)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/rfbregion.c has a NULL pointer     dereference.(CVE-2020-14397)

  - An issue was discovered in LibVNCServer before 0.9.13.
    Byte-aligned data is accessed through uint32_t pointers     in libvncclient/rfbproto.c.(CVE-2020-14399)

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.

Several minor vulnerabilities have been discovered in libvncserver, a server and client implementation of the VNC protocol.

CVE-2019-20839

libvncclient/sockets.c in LibVNCServer had a buffer overflow via a long socket filename.

CVE-2020-14397

libvncserver/rfbregion.c has a NULL pointer dereference.

CVE-2020-14399

Byte-aligned data was accessed through uint32_t pointers in libvncclient/rfbproto.c.

NOTE: This issue has been disputed by third parties; there is reportedly 'no trust boundary crossed'.

CVE-2020-14400

Byte-aligned data was accessed through uint16_t pointers in libvncserver/translate.c.

NOTE: This issue has been disputed by third parties. There is no known path of exploitation or cross of a trust boundary.

CVE-2020-14401

libvncserver/scale.c had a pixel_value integer overflow.

CVE-2020-14402

libvncserver/corre.c allowed out-of-bounds access via encodings.

CVE-2020-14403

libvncserver/hextile.c allowed out-of-bounds access via encodings.

CVE-2020-14404

libvncserver/rre.c allowed out-of-bounds access via encodings.

CVE-2020-14405

libvncclient/rfbproto.c did not limit TextChat size.

For Debian 9 stretch, these problems have been fixed in version 0.9.11+dfsg-1.3~deb9u5.

We recommend that you upgrade your libvncserver packages.

For the detailed security status of libvncserver please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libvncserver

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

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1811 advisory.

  - libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)

  - libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)

  - libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)

  - libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)

  - libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

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

This update for LibVNCServer fixes the following issues :

security update

added patches fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak

  + LibVNCServer-CVE-2018-21247.patch fix CVE-2019-20839     [bsc#1173875], buffer overflow in     ConnectClientToUnixSock()

  + LibVNCServer-CVE-2019-20839.patch fix CVE-2019-20840     [bsc#1173876], unaligned accesses in hybiReadAndDecode     can lead to denial of service

  + LibVNCServer-CVE-2019-20840.patch fix CVE-2020-14398     [bsc#1173880], improperly closed TCP connection causes     an infinite loop in libvncclient/sockets.c

  + LibVNCServer-CVE-2020-14398.patch fix CVE-2020-14397     [bsc#1173700], NULL pointer dereference in     libvncserver/rfbregion.c

  + LibVNCServer-CVE-2020-14397.patch fix CVE-2020-14399     [bsc#1173743], Byte-aligned data is accessed through     uint32_t pointers in libvncclient/rfbproto.c.

  + LibVNCServer-CVE-2020-14399.patch fix CVE-2020-14400     [bsc#1173691], Byte-aligned data is accessed through     uint16_t pointers in libvncserver/translate.c.

  + LibVNCServer-CVE-2020-14400.patch fix CVE-2020-14401     [bsc#1173694], potential integer overflows in     libvncserver/scale.c

  + LibVNCServer-CVE-2020-14401.patch fix CVE-2020-14402     [bsc#1173701], out-of-bounds access via encodings.

  + LibVNCServer-CVE-2020-14402,14403,14404.patch fix     CVE-2017-18922 [bsc#1173477], preauth buffer overwrite

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.

The remote NewStart CGSL host, running version MAIN 6.02, has libvncserver packages installed that are affected by multiple vulnerabilities:

  - An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized     memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function. (CVE-2018-21247)

  - libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.
    (CVE-2019-20839)

  - An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer     dereference. (CVE-2020-14397)

  - An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat     size. (CVE-2020-14405)

  - A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw     to send a specially crafted message that, when processed by the VNC server, would lead to a floating point     exception, resulting in a denial of service. (CVE-2020-25708)

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer     dereference. (CVE-2020-14397)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0108 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2018-20337:
    There is a stack-based buffer overflow in the parse_makernote function of dcraw_common.cpp in LibRaw     0.19.1. Crafted input will lead to a denial of service or possibly unspecified other impact.

    CVE-2019-3825:
    A vulnerability was discovered in gdm before 3.31.4. When timed login is enabled in configuration, an     attacker could bypass the lock screen by selecting the timed login user and waiting for the timer to     expire, at which time they would gain access to the logged-in user's session.

    CVE-2019-3827:
    An incorrect permission check in the admin backend in gvfs before version 1.39.4 was found that allows     reading and modify arbitrary files by privileged users without asking for password when no authentication     agent is running. This vulnerability can be exploited by malicious programs running under privileges of     users belonging to the wheel group to further escalate its privileges by modifying system files without     user's knowledge. Successful exploitation requires uncommon system configuration.

    CVE-2019-12447:
    An issue was discovered in GNOME gvfs 1.29.4 through 1.41.2. daemon/gvfsbackendadmin.c mishandles file     ownership because setfsuid is not used.

    CVE-2019-12448:
    An issue was discovered in GNOME gvfs 1.29.4 through 1.41.2. daemon/gvfsbackendadmin.c has race conditions     because the admin backend doesn't implement query_info_on_read/write.

    CVE-2019-12449:
    An issue was discovered in GNOME gvfs 1.29.4 through 1.41.2. daemon/gvfsbackendadmin.c mishandles a file's     user and group ownership during move (and copy with G_FILE_COPY_ALL_METADATA) operations from admin:// to     file:// URIs, because root privileges are unavailable.

    CVE-2019-12795:
    daemon/gvfsdaemon.c in gvfsd from GNOME gvfs before 1.38.3, 1.40.x before 1.40.2, and 1.41.x before 1.41.3     opened a private D-Bus server socket without configuring an authorization rule. A local attacker could     connect to this server socket and issue D-Bus method calls.(Note that the server socket only accepts a     single connection, so the attacker would have to discover the server and connect to the socket before its     owner does.)

    CVE-2019-15690:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

    CVE-2019-20839:
    libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.

    CVE-2020-14397:
    An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer     dereference.

    CVE-2020-14405:
    An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat     size.

    CVE-2020-15503:
    LibRaw before 0.20-RC1 lacks a thumbnail size range check. This affects decoders/unpack_thumb.cpp,     postprocessing/mem_image.cpp, and utils/thumb_utils.cpp. For example,     malloc(sizeof(libraw_processed_image_t)+T.tlength) occurs without validating T.tlength.

    CVE-2020-25708:
    A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw     to send a specially crafted message that, when processed by the VNC server, would lead to a floating point     exception, resulting in a denial of service.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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 version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0108 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2018-20337:
    There is a stack-based buffer overflow in the parse_makernote function of dcraw_common.cpp in LibRaw     0.19.1. Crafted input will lead to a denial of service or possibly unspecified other impact.

    CVE-2019-3825:
    A vulnerability was discovered in gdm before 3.31.4. When timed login is enabled in configuration, an     attacker could bypass the lock screen by selecting the timed login user and waiting for the timer to     expire, at which time they would gain access to the logged-in user's session.

    CVE-2019-3827:
    An incorrect permission check in the admin backend in gvfs before version 1.39.4 was found that allows     reading and modify arbitrary files by privileged users without asking for password when no authentication     agent is running. This vulnerability can be exploited by malicious programs running under privileges of     users belonging to the wheel group to further escalate its privileges by modifying system files without     user's knowledge. Successful exploitation requires uncommon system configuration.

    CVE-2019-12447:
    An issue was discovered in GNOME gvfs 1.29.4 through 1.41.2. daemon/gvfsbackendadmin.c mishandles file     ownership because setfsuid is not used.

    CVE-2019-12448:
    An issue was discovered in GNOME gvfs 1.29.4 through 1.41.2. daemon/gvfsbackendadmin.c has race conditions     because the admin backend doesn't implement query_info_on_read/write.

    CVE-2019-12449:
    An issue was discovered in GNOME gvfs 1.29.4 through 1.41.2. daemon/gvfsbackendadmin.c mishandles a file's     user and group ownership during move (and copy with G_FILE_COPY_ALL_METADATA) operations from admin:// to     file:// URIs, because root privileges are unavailable.

    CVE-2019-12795:
    daemon/gvfsdaemon.c in gvfsd from GNOME gvfs before 1.38.3, 1.40.x before 1.40.2, and 1.41.x before 1.41.3     opened a private D-Bus server socket without configuring an authorization rule. A local attacker could     connect to this server socket and issue D-Bus method calls.(Note that the server socket only accepts a     single connection, so the attacker would have to discover the server and connect to the socket before its     owner does.)

    CVE-2019-15690:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

    CVE-2019-20839:
    libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.

    CVE-2020-14397:
    An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer     dereference.

    CVE-2020-14405:
    An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat     size.

    CVE-2020-15503:
    LibRaw before 0.20-RC1 lacks a thumbnail size range check. This affects decoders/unpack_thumb.cpp,     postprocessing/mem_image.cpp, and utils/thumb_utils.cpp. For example,     malloc(sizeof(libraw_processed_image_t)+T.tlength) occurs without validating T.tlength.

    CVE-2020-25708:
    A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw     to send a specially crafted message that, when processed by the VNC server, would lead to a floating point     exception, resulting in a denial of service.

Tenable has extracted the preceding description block directly from the Tencent 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
142357	EulerOS 2.0 SP2 : libvncserver (EulerOS-SA-2020-2362)	Nessus	Huawei Local Security Checks	2020/11/3	2022/5/11	high
141301	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Vino vulnerabilities (USN-4573-1)	Nessus	Ubuntu Local Security Checks	2020/10/8	2024/8/27	critical
294004	MiracleLinux 8 : libvncserver-0.9.11-17.el8 (AXSA:2021-2098:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
149663	RHEL 8 : libvncserver (RHSA-2021:1811)	Nessus	Red Hat Local Security Checks	2021/5/19	2024/11/7	high
138751	openSUSE Security Update : LibVNCServer (openSUSE-2020-988)	Nessus	SuSE Local Security Checks	2020/7/20	2024/2/29	critical
138828	openSUSE Security Update : LibVNCServer (openSUSE-2020-1025)	Nessus	SuSE Local Security Checks	2020/7/22	2024/2/29	critical
138984	openSUSE Security Update : LibVNCServer (openSUSE-2020-1056)	Nessus	SuSE Local Security Checks	2020/7/27	2024/2/28	critical
139141	EulerOS 2.0 SP8 : libvncserver (EulerOS-SA-2020-1811)	Nessus	Huawei Local Security Checks	2020/7/30	2022/5/12	high
140046	Debian DLA-2347-1 : libvncserver security update	Nessus	Debian Local Security Checks	2020/8/31	2020/9/2	medium
149728	CentOS 8 : libvncserver (CESA-2021:1811)	Nessus	CentOS Local Security Checks	2021/5/19	2024/1/1	high
138548	SUSE SLED15 / SLES15 Security Update : LibVNCServer (SUSE-SU-2020:1922-1)	Nessus	SuSE Local Security Checks	2020/7/16	2024/3/1	critical
160737	NewStart CGSL MAIN 6.02 : libvncserver Multiple Vulnerabilities (NS-SA-2022-0048)	Nessus	NewStart CGSL Local Security Checks	2022/5/9	2023/10/30	high
223261	Linux Distros Unpatched Vulnerability : CVE-2020-14397	Nessus	Misc.	2025/3/4	2026/5/30	high
236504	Alibaba Cloud Linux 3 : 0108: GNOME (ALINUX3-SA-2022:0108)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high
239637	TencentOS Server 3: GNOME (TSSA-2022:0108)	Nessus	Tencent Local Security Checks	2025/6/16	2025/12/5	high

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