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

  - 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)

  - It was discovered that websockets.c in LibVNCServer     prior to 0.9.12 did not properly decode certain     WebSocket frames. A malicious attacker could exploit     this by sending specially crafted WebSocket frames to a     server, causing a heap-based buffer     overflow.(CVE-2017-18922)

  - 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)

  - 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 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 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.

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 remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4587-1 advisory.

  - Integer overflow in the MallocFrameBuffer function in vncviewer.c in LibVNCServer 0.9.9 and earlier allows     remote VNC servers to cause a denial of service (crash) and possibly execute arbitrary code via an     advertisement for a large screen size, which triggers a heap-based buffer overflow. (CVE-2014-6051)

  - The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer 0.9.9 and earlier does not     check certain malloc return values, which allows 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-2014-6052)

  - The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier     does not properly handle attempts to send a large amount of ClientCutText data, which allows remote     attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is     processed by using a single unchecked malloc. (CVE-2014-6053)

  - The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier     allows 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-2014-6054)

  - Multiple stack-based buffer overflows in the File Transfer feature in rfbserver.c in LibVNCServer 0.9.9     and earlier allow 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-2014-6055)

  - 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)

  - An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c     does 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-2018-7225)

  - LibVNC before commit 502821828ed00b4a2c4bef90683d0fd88ce495de contains heap out-of-bound write     vulnerability in server code of file transfer extension that can result remote code execution     (CVE-2018-15127)

  - LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write     vulnerabilities in VNC client code that can result remote code execution (CVE-2018-20019)

  - LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write     vulnerability inside structure in VNC client code that can result remote code execution (CVE-2018-20020)

  - LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop     vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources     like CPU and RAM (CVE-2018-20021)

  - LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper     Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse     for information disclosure. Combined with another vulnerability, it can be used to leak stack memory     layout and in bypassing ASLR (CVE-2018-20022)

  - LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization     vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for     information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout     and in bypassing ASLR (CVE-2018-20023)

  - LibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC     client code that can result DoS. (CVE-2018-20024)

  - LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in     libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete. (CVE-2018-20748)

  - LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The     fix for CVE-2018-15127 was incomplete. (CVE-2018-20749)

  - LibVNC through 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The     fix for CVE-2018-15127 was incomplete. (CVE-2018-20750)

  - 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 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 one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libvncserver: information disclosure and ASLR bypass (CVE-2019-15681)

  - libvncserver: libvncserver/rre.c allows out-of-bounds access via encodings (CVE-2020-14404)

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

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

最近，在适用于 Windows 和 Unix 的基于 X11 的 VNC 服务器/查看器应用程序 TightVNC 1.x 中发现多个漏洞。

CVE-2014-6053

TightVNC 服务器的 rfbserver.c 中的 rfbProcessClientNormalMessage 函数未正确处理发送大量 ClientCutText 数据的尝试，这使得远程攻击者能够通过以未经检查的 malloc 处理过的特制消息，造成拒绝服务（内存消耗或后台程序崩溃）。

CVE-2018-7225

rfbserver.c 中的 rfbProcessClientNormalMessage() 未审查 msg.cct.length，导致可通过特别构建的 VNC 数据包，访问未初始化且可能敏感的数据，或者可能造成其他不明影响（例如整数溢出）。

CVE-2019-8287

TightVNC 代码的 HandleCoRREBBP 宏函数中包含全局缓冲区溢出漏洞，这可能会导致代码执行。此攻击似乎可通过网络连接加以利用。

（亦称 CVE-2018-20020/libvncserver）

CVE-2018-20021

vncviewer/rfbproto.c 的 TightVNC 中包含 CWE-835：无限循环漏洞。该漏洞让攻击者可以过度消耗 CPU 和 RAM 等资源。

CVE-2018-20022

TightVNC 的 vncviewer 包含多个漏洞 CWE-665：VNC 客户端代码中存在未正确初始化漏洞，这使得攻击者能够读取堆栈内存，并可能会遭到滥用，导致信息泄露。
此漏洞与其他漏洞结合还可用于泄露堆栈内存布局并绕过 ASLR。

CVE-2019-15678

TightVNC 代码版本的 rfbServerCutText 处理程序中包含堆缓冲区溢出漏洞，这可能导致代码执行。此攻击似乎可通过网络连接加以利用。

（部分亦称 CVE-2018-20748/libvnvserver）

CVE-2019-15679

TightVNC vncviewer 代码的 InitialiseRFBConnection 函数中包含堆缓冲区溢出漏洞，这可能导致代码执行。此攻击似乎可通过网络连接加以利用。

（部分亦称 CVE-2018-20748/libvnvserver）

CVE-2019-15680

TightVNC vncviewer 代码的 HandleZlibBPP 函数中包含空指针取消引用漏洞，该漏洞可能会导致拒绝系统 (DoS)。此攻击似乎可通过网络连接加以利用。

CVE-2019-15681

TightVNC 的 VNC 服务器代码中包含内存泄露 (CWE-655)，该漏洞让攻击者可以读取堆栈内存，并且可能会遭到滥用，导致信息泄露。此漏洞与其他漏洞结合还可用于泄露堆栈内存并绕过 ASLR。此攻击似乎可通过网络连接加以利用。

对于 Debian 8“Jessie”，已在版本 1.3.9-6.5+deb8u1 中修复这些问题。

我们建议您升级 tightvnc 程序包。

注意：Tenable Network Security 已直接从 DLA 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行自动清理和排版。

远程 Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS 主机上安装的程序包受到 USN-4573-1 公告中提及的多个漏洞的影响。

  - LibVNCServer 0.9.9 及其之前版本的 libvncserver/rfbserver.c 中的 rfbProcessClientNormalMessage 函数未正确处理发送大量 ClientCutText 数据的尝试，远程攻击者可利用此问题，通过由使用单个未经检查的 malloc 所处理的构建消息，造成拒绝服务（内存消耗或后台程序崩溃）。(CVE-2014-6053)

  - 在 LibVNCServer 0.9.11 及之前版本中发现一个问题。rfbserver.c 中的 rfbProcessClientNormalMessage() 未审查 msg.cct.length，导致攻击者可通过特别构建的 VNC 数据包，访问未初始化且可能敏感的数据，或者可能造成其他不明影响（例如整数溢出）。
    (CVE-2018-7225)

  - 在 commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a 之前的 LibVNC 内，VNC 服务器代码中存在内存泄露 (CWE-655)，攻击者可利用此漏洞读取堆栈内存，并且可能滥用此漏洞泄露信息。
    攻击者可同时利用此漏洞及其他漏洞，泄露堆栈内存并绕过 ASLR。此攻击似乎可通过网络连接加以利用。这些漏洞已在 commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a 中修复。(CVE-2019-15681)

  - 在 LibVNCServer 0.9.13 之前版本中发现一个问题。libvncserver/rfbregion.c 中存在空指针取消引用。(CVE-2020-14397)

  - 在 LibVNCServer 0.9.13 之前版本中发现一个问题。libvncserver/corre.c 允许通过编码进行越界访问。(CVE-2020-14402)

  - 在 LibVNCServer 0.9.13 之前版本中发现一个问题。libvncserver/hextile.c 允许通过编码进行越界访问。(CVE-2020-14403)

  - 在 LibVNCServer 0.9.13 之前版本中发现一个问题。libvncserver/rre.c 允许通过编码进行越界访问。(CVE-2020-14404)

请注意，Nessus 尚未测试此问题，而是只依靠应用程序自我报告的版本号来判断。

远程 Ubuntu 18.04 LTS 主机上安装的程序包受到 USN-4547-1 公告中提及的多个漏洞的影响。

  - 在 LibVNCServer 0.9.11 及之前版本中发现一个问题。rfbserver.c 中的 rfbProcessClientNormalMessage() 未审查 msg.cct.length，导致攻击者可通过特别构建的 VNC 数据包，访问未初始化且可能敏感的数据，或者可能造成其他不明影响（例如整数溢出）。
    (CVE-2018-7225)

  - 在 commit 502821828ed00b4a2c4bef90683d0fd88ce495de 之前的 LibVNC 内，文件传输扩展的服务器代码中存在堆栈越界写入漏洞，可导致远程代码执行 (CVE-2018-15127)

  - 在 commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f 之前的 LibVNC 内，VNC 客户端代码中存在多个堆越界写入漏洞，可导致远程代码执行 (CVE-2018-20019)

  - 在 commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d 之前的 LibVNC 中，VNC 客户端代码的内部结构中存在堆越界写入漏洞，可导致远程代码执行 (CVE-2018-20020)

  - commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c 之前的 LibVNC 中存在 CWE-835：VNC 客户端代码中的无限循环漏洞。攻击者可利用此漏洞过度消耗 CPU 和 RAM 等资源 (CVE-2018-20021)

  - 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 之前的 LibVNC 中存在多个漏洞 CWE-665：使用者可利用 VNC 客户端代码中的初始化不当漏洞读取堆栈内存，并可能滥用该漏洞泄露信息。攻击者可同时利用此漏洞及其他漏洞，泄露堆栈内存布局并绕过 ASLR (CVE-2018-20022)

  - 8b06f835e259652b0ff026898014fc7297ade858 之前的 LibVNC 中存在 CWE-665：使用者可利用 VNC Repeater 客户端代码中的初始化不当漏洞读取堆栈内存，并可能滥用该漏洞泄露信息。攻击者可同时利用此漏洞及其他漏洞，泄露堆栈内存布局并绕过 ASLR (CVE-2018-20023)

  - 在 commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 之前的 LibVNC 内，VNC 客户端代码中存在空指针取消引用，可导致 DoS。(CVE-2018-20024)

  - 在 0.9.12 之前的 LibVNC 内，libvncclient/rfbproto.c 中存在多个堆越界写入漏洞。针对 CVE-2018-20019 的修复不完整。(CVE-2018-20748)

  - 在 0.9.12 之前的 LibVNC 内，libvncserver/rfbserver.c 中存在堆越界写入漏洞。针对 CVE-2018-15127 的修复不完整。(CVE-2018-20749)

  - 在 LibVNC 0.9.12 及之前版本内，libvncserver/rfbserver.c 中存在堆越界写入漏洞。针对 CVE-2018-15127 的修复不完整。(CVE-2018-20750)

  - 在 commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a 之前的 LibVNC 内，VNC 服务器代码中存在内存泄露 (CWE-655)，攻击者可利用此漏洞读取堆栈内存，并且可能滥用此漏洞泄露信息。
    攻击者可同时利用此漏洞及其他漏洞，泄露堆栈内存并绕过 ASLR。此攻击似乎可通过网络连接加以利用。这些漏洞已在 commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a 中修复。(CVE-2019-15681)

请注意，Nessus 尚未测试此问题，而是只依靠应用程序自我报告的版本号。

ID	名稱	產品	系列	已發布	已更新	嚴重性
146731	EulerOS 2.0 SP2 : libvncserver (EulerOS-SA-2021-1321)	Nessus	Huawei Local Security Checks	2021/2/22	2024/1/19	critical
145203	EulerOS 2.0 SP3 : vino (EulerOS-SA-2021-1129)	Nessus	Huawei Local Security Checks	2021/1/20	2024/1/29	high
150539	SUSE SLES11 Security Update : LibVNCServer (SUSE-SU-2020:14355-1)	Nessus	SuSE Local Security Checks	2021/6/10	2023/12/26	critical
141545	Ubuntu 16.04 LTS : iTALC vulnerabilities (USN-4587-1)	Nessus	Ubuntu Local Security Checks	2020/10/20	2023/10/20	critical
199441	RHEL 8 : vino (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	2024/6/3	2024/6/3	high
132345	Debian DLA-2045-1：tightvnc 安全更新	Nessus	Debian Local Security Checks	2019/12/23	2024/4/2	critical
141301	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS：Vino 漏洞 (USN-4573-1)	Nessus	Ubuntu Local Security Checks	2020/10/8	2023/10/20	critical
140920	Ubuntu 18.04 LTS：iTALC 漏洞 (USN-4547-1)	Nessus	Ubuntu Local Security Checks	2020/9/28	2023/10/20	critical

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