This update for vino fixes the following issues :

CVE-2019-15681: Fixed a memory leak which could have allowed to a remote attacker to read stack memory (bsc#1155419).

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 Ubuntu 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4547-1 advisory.

    It was discovered that an information disclosure vulnerability existed in the LibVNCServer vendored in     iTALC when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive     information. (CVE-2019-15681)

    It was discovered that the LibVNCServer and LibVNCClient vendored in iTALC 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-2018-15127 CVE-2018-20019, CVE-2018-20020,     CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749,     CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)

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.

According to the version of the vino package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - LibVNC commit before     d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a contains a     memory leak (CWE-655) in VNC server code, which allow     an attacker to read stack memory and can be abused for     information disclosure. Combined with another     vulnerability, it can be used to leak stack memory and     bypass ASLR. This attack appear to be exploitable via     network connectivity. These vulnerabilities have been     fixed in commit     d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a.(CVE-2019-1568     1)

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.

LibVNC contained a memory leak (CWE-655) in VNC server code, which allowed an attacker to read stack memory and could be abused for information disclosure.

For Debian 8 'Jessie', this problem has been fixed in version 0.9.9+dfsg2-6.1+deb8u6.

We recommend that you upgrade your libvncserver packages.

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.

Several vulnerabilities have been identified in the VNC code of iTALC, a classroom management software. All vulnerabilities referenced below are issues that have originally been reported against Debian source package libvncserver. The italc source package in Debian ships a custom-patched version of libvncserver, thus libvncserver's security fixes required porting over.

CVE-2014-6051

Integer overflow in the MallocFrameBuffer function in vncviewer.c in LibVNCServer allowed remote VNC servers to cause a denial of service (crash) and possibly executed arbitrary code via an advertisement for a large screen size, which triggered a heap-based buffer overflow.

CVE-2014-6052

The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer did not check certain malloc return values, which allowed remote VNC servers to cause a denial of service (application crash) or possibly execute arbitrary code by specifying a large screen size in a (1) FramebufferUpdate, (2) ResizeFrameBuffer, or (3) PalmVNCReSizeFrameBuffer message.

CVE-2014-6053

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer did not properly handle attempts to send a large amount of ClientCutText data, which allowed remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that was processed by using a single unchecked malloc.

CVE-2014-6054

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer allowed remote attackers to cause a denial of service (divide-by-zero error and server crash) via a zero value in the scaling factor in a (1) PalmVNCSetScaleFactor or (2) SetScale message.

CVE-2014-6055

Multiple stack-based buffer overflows in the File Transfer feature in rfbserver.c in LibVNCServer allowed remote authenticated users to cause a denial of service (crash) and possibly execute arbitrary code via a (1) long file or (2) directory name or the (3) FileTime attribute in a rfbFileTransferOffer message.

CVE-2016-9941

Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer allowed 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-2016-9942

Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer allowed 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 exceeded what is specified by the tile dimensions.

CVE-2018-6307

LibVNC contained heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

CVE-2018-7225

An issue was discovered in LibVNCServer.
rfbProcessClientNormalMessage() in rfbserver.c did not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.

CVE-2018-15126

LibVNC contained heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

CVE-2018-15127

LibVNC contained heap out-of-bound write vulnerability in server code of file transfer extension that can result remote code execution

CVE-2018-20749

LibVNC contained a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

CVE-2018-20750

LibVNC contained a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

CVE-2018-20019

LibVNC contained multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution

CVE-2018-20748

LibVNC contained multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.

CVE-2018-20020

LibVNC contained heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution

CVE-2018-20021

LibVNC contained a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM

CVE-2018-20022

LibVNC contained multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allowed attackers to read stack memory and could be abused for information disclosure. Combined with another vulnerability, it could be used to leak stack memory layout and in bypassing ASLR.

CVE-2018-20023

LibVNC contained CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allowed attacker to read stack memory and could be abused for information disclosure. Combined with another vulnerability, it could be used to leak stack memory layout and in bypassing ASLR.

CVE-2018-20024

LibVNC contained NULL pointer dereference in VNC client code that could result DoS.

CVE-2019-15681

LibVNC contained a memory leak (CWE-655) in VNC server code, which allowed an attacker to read stack memory and could be abused for information disclosure. Combined with another vulnerability, it could be used to leak stack memory and bypass ASLR. This attack appeared to be exploitable via network connectivity.

For Debian 8 'Jessie', these problems have been fixed in version 1:2.0.2+dfsg1-2+deb8u1.

We recommend that you upgrade your italc packages.

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.

This update for LibVNCServer fixes the following issues :

  - CVE-2019-15690: Fixed a heap buffer overflow     (bsc#1160471).

  - CVE-2019-15681: Fixed a memory leak which could have     allowed to a remote attacker to read stack memory     (bsc#1155419).

  - CVE-2019-20788: Fixed a integer overflow and heap-based     buffer overflow via a large height or width value     (bsc#1170441).

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

This update for vino fixes the following issues :

  - CVE-2019-15681: Fixed a memory leak which could have     allowed to a remote attacker to read stack memory     (bsc#1155419).

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

The remote SUSE Linux SLES11 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2020:14355-1 advisory.

  - LibVNC commit before d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a contains a memory leak (CWE-655) in VNC     server code, which allow an attacker to read stack memory and can be abused for information disclosure.
    Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack     appear to be exploitable via network connectivity. These vulnerabilities have been fixed in commit     d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a. (CVE-2019-15681)

  - libvncserver: HandleCursorShape() integer overflow resulting in heap-based buffer overflow     (CVE-2019-15690)

  - 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. NOTE: this may overlap CVE-2019-15690.
    (CVE-2019-20788)

Note that Nessus has not tested for this issue 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.

  - LibVNC commit before d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a contains a memory leak (CWE-655) in VNC     server code, which allow an attacker to read stack memory and can be abused for information disclosure.
    Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack     appear to be exploitable via network connectivity. These vulnerabilities have been fixed in commit     d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a. (CVE-2019-15681)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
135388	SUSE SLES12 Security Update : vino (SUSE-SU-2020:0955-1)	Nessus	SuSE Local Security Checks	2020/4/10	2020/8/21	high
140920	Ubuntu 18.04 LTS : iTALC vulnerabilities (USN-4547-1)	Nessus	Ubuntu Local Security Checks	2020/9/28	2024/8/27	critical
144222	EulerOS 2.0 SP5 : vino (EulerOS-SA-2020-2569)	Nessus	Huawei Local Security Checks	2020/12/15	2024/2/2	high
145203	EulerOS 2.0 SP3 : vino (EulerOS-SA-2021-1129)	Nessus	Huawei Local Security Checks	2021/1/20	2024/1/29	high
130406	Debian DLA-1977-1 : libvncserver security update	Nessus	Debian Local Security Checks	2019/10/31	2021/1/11	high
130408	Debian DLA-1979-1 : italc security update	Nessus	Debian Local Security Checks	2019/10/31	2024/4/16	critical
136453	openSUSE Security Update : LibVNCServer (openSUSE-2020-624)	Nessus	SuSE Local Security Checks	2020/5/11	2024/3/13	critical
138989	openSUSE Security Update : vino (openSUSE-2020-1071)	Nessus	SuSE Local Security Checks	2020/7/27	2020/8/21	high
150539	SUSE SLES11 Security Update : LibVNCServer (SUSE-SU-2020:14355-1)	Nessus	SuSE Local Security Checks	2021/6/10	2023/12/26	critical
222415	Linux Distros Unpatched Vulnerability : CVE-2019-15681	Nessus	Misc.	2025/3/4	2026/4/28	high

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