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.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libvncserver: Multiple heap out-of-bound writes in VNC client code (Incomplete fix for CVE-2018-20019)     (CVE-2018-20748)

  - Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote     servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted     FramebufferUpdate message containing a subrectangle outside of the client drawing area. (CVE-2016-9941)

  - Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers     to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted     FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds     what is specified by the tile dimensions. (CVE-2016-9942)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

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

  - 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 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 remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:1811 advisory.

  - 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 this issue but has instead relied only on the application's self-reported version number.

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

    - Fix CVE-2020-25708       Resolves: #1898078
    - Fix CVE-2019-20839       Resolves: #1851032
    - Fix CVE-2018-21247       Resolves: #1852516
    - Fix CVE-2020-14405       Resolves: #1860527

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 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.

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.

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.

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

  - LibVNCServer makes writing a VNC server (or more     correctly, a program exporting a frame-buffer via the     Remote Frame Buffer protocol) easy. It hides the     programmer from the tedious task of managing clients     and compression schemata.Security Fix(es):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. NOTE: there is reportedly 'no     trust boundary crossed.'(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. NOTE: Third parties do not     consider this to be a vulnerability as there is no     known path of exploitation or cross of a trust     boundary.(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)libvncclient/cursor.c in     LibVNCServer through 0.9.12 has a HandleCursorShape     integer overflow and heap-based buffer overflow via a     large height or width value. (CVE-2019-20788)

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.

According to the versions of the libvncserve packages 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.

This update for LibVNCServer fixes the following issues :

security update fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak fix CVE-2019-20839 [bsc#1173875], buffer overflow in ConnectClientToUnixSock() fix CVE-2019-20840 [bsc#1173876], unaligned accesses in hybiReadAndDecode can lead to denial of service fix CVE-2020-14398 [bsc#1173880], improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c fix CVE-2020-14397 [bsc#1173700], NULL pointer dereference in libvncserver/rfbregion.c fix CVE-2020-14399 [bsc#1173743], Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c. fix CVE-2020-14400 [bsc#1173691], Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c. fix CVE-2020-14401 [bsc#1173694], potential integer overflows in libvncserver/scale.c fix CVE-2020-14402 [bsc#1173701], out-of-bounds access via encodings. fix CVE-2020-14403 [bsc#1173701], out-of-bounds access via encodings. fix CVE-2020-14404 [bsc#1173701], out-of-bounds access via encodings. 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.

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.

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.

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.

New upstream bugfix/security release.

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

New upstream bugfix and security release.

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

ID	Name	Product	Family	Severity
199929	RHEL 7 : libvncserver (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
196314	RHEL 7 : libvncserver (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
184742	Rocky Linux 8 : libvncserver (RLSA-2021:1811)	Nessus	Rocky Linux Local Security Checks	high
160737	NewStart CGSL MAIN 6.02 : libvncserver Multiple Vulnerabilities (NS-SA-2022-0048)	Nessus	NewStart CGSL Local Security Checks	high
157648	AlmaLinux 8 : libvncserver (ALSA-2021:1811)	Nessus	Alma Linux Local Security Checks	high
149968	Oracle Linux 8 : libvncserver (ELSA-2021-1811)	Nessus	Oracle Linux Local Security Checks	high
149728	CentOS 8 : libvncserver (CESA-2021:1811)	Nessus	CentOS Local Security Checks	high
149663	RHEL 8 : libvncserver (RHSA-2021:1811)	Nessus	Red Hat Local Security Checks	high
142357	EulerOS 2.0 SP2 : libvncserver (EulerOS-SA-2020-2362)	Nessus	Huawei Local Security Checks	high
140883	EulerOS 2.0 SP3 : libvncserver (EulerOS-SA-2020-2116)	Nessus	Huawei Local Security Checks	critical
140161	EulerOS 2.0 SP5 : libvncserve (EulerOS-SA-2020-1940)	Nessus	Huawei Local Security Checks	high
139453	SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2020:2167-1)	Nessus	SuSE Local Security Checks	critical
139141	EulerOS 2.0 SP8 : libvncserver (EulerOS-SA-2020-1811)	Nessus	Huawei Local Security Checks	high
138984	openSUSE Security Update : LibVNCServer (openSUSE-2020-1056)	Nessus	SuSE Local Security Checks	critical
138828	openSUSE Security Update : LibVNCServer (openSUSE-2020-1025)	Nessus	SuSE Local Security Checks	critical
138751	openSUSE Security Update : LibVNCServer (openSUSE-2020-988)	Nessus	SuSE Local Security Checks	critical
138548	SUSE SLED15 / SLES15 Security Update : LibVNCServer (SUSE-SU-2020:1922-1)	Nessus	SuSE Local Security Checks	critical
138530	Fedora 32 : libvncserver (2020-1a4b1c8271)	Nessus	Fedora Local Security Checks	critical
138476	Fedora 31 : libvncserver (2020-37112ac660)	Nessus	Fedora Local Security Checks	critical

Detections

Analytics

CVE-2018-21247

high

Tenable Plugins

critical

critical

high

high

high

high

high

high

high

critical

high

critical

high

critical

critical

critical

critical

critical

critical