远程 Ubuntu 16.04 LTS 主机上安装的程序包受到 USN-4587-1 公告中提及的多个漏洞的影响。

  - LibVNCServer 0.9.9 及其之前版本中，vncviewer.c 的 MallocFrameBuffer 函数中存在整数溢出，远程 VNC 服务器可借此通过大屏幕尺寸的公告造成拒绝服务（崩溃）并可能执行任意代码，从而触发基于堆的缓冲区溢出。(CVE-2014-6051)

  - LibVNCServer 0.9.9 及其之前版本中，libvncclient/rfbproto.c 中的 HandleRFBServerMessage 函数未检查某些 malloc 返回值，远程 VNC 服务器可借此通过指定 (1) FramebufferUpdate，(2) ResizeFrameBuffer 或 (3) PalmVNCReSizeFrameBuffer 消息中的大屏幕尺寸以造成拒绝服务（应用程序崩溃）或可能执行任意代码。(CVE-2014-6052)

  - LibVNCServer 0.9.9 及其之前版本中，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)

  - 远程攻击者可利用 LibVNCServer 0.9.9 及其之前版本的 libvncserver/rfbserver.c 中的 rfbProcessClientNormalMessage 函数，通过 (1) PalmVNCSetScaleFactor 或 (2) SetScale 消息中缩放因子的零值造成拒绝服务（除零错误和服务器崩溃）。(CVE-2014-6054)

  - LibVNCServer 0.9.9 及其之前版本的 rfbserver.c 的文件传输功能中存在多个基于堆栈的缓冲区溢出，经过身份验证的远程用户可利用此问题，通过 rfbFileTransferOffer 消息中的 (1) 长文件或 (2) 目录名称或 (3) FileTime 属性造成拒绝服务（崩溃）并可能执行任意代码。(CVE-2014-6055)

  - LibVNCServer 0.9.11 之前版本的 LibVNCClient 的 rfbproto.c 中存在基于堆的缓冲区溢出，远程服务器可利用此问题，通过构建的 FramebufferUpdate 消息（包含在客户端绘制区域之外的子矩形）造成拒绝服务（应用程序崩溃）或可能执行任意代码。(CVE-2016-9941)

  - LibVNCServer 0.9.11 之前版本的 LibVNCClient 的 ultra.c 中存在基于堆的缓冲区溢出，远程服务器可利用此问题，通过具有 Ultra 类型平铺的构建 FramebufferUpdate 消息，造成拒绝服务（应用程序崩溃）或可能执行任意代码，从而导致 LZO 有效负载解压缩长度超过平铺尺寸指定的长度。(CVE-2016-9942)。

  - 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来判断。

Several vulnerabilities have been identified in the VNC code of vino, a desktop sharing utility for the GNOME desktop environment.

The vulnerabilities referenced below are issues that have originally been reported against Debian source package libvncserver. The vino source package in Debian ships a custom-patched and stripped down variant of libvncserver, thus some of libvncserver's security fixes required porting over.

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-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-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 3.14.0-2+deb8u1.

We recommend that you upgrade your vino 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.

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.

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.

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.

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 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.

ID	名稱	產品	系列	已發布	已更新	嚴重性
141545	Ubuntu 16.04 LTS：iTALC 漏洞 (USN-4587-1)	Nessus	Ubuntu Local Security Checks	2020/10/20	2023/10/20	critical
131432	Debian DLA-2014-1 : vino security update	Nessus	Debian Local Security Checks	2019/12/3	2024/4/9	critical
130408	Debian DLA-1979-1 : italc security update	Nessus	Debian Local Security Checks	2019/10/31	2024/4/16	critical
141545	Ubuntu 16.04 LTS : iTALC vulnerabilities (USN-4587-1)	Nessus	Ubuntu Local Security Checks	2020/10/20	2023/10/20	critical
145203	EulerOS 2.0 SP3 : vino (EulerOS-SA-2021-1129)	Nessus	Huawei Local Security Checks	2021/1/20	2024/1/29	high
146731	EulerOS 2.0 SP2 : libvncserver (EulerOS-SA-2021-1321)	Nessus	Huawei Local Security Checks	2021/2/22	2024/1/19	critical
150539	SUSE SLES11 Security Update : LibVNCServer (SUSE-SU-2020:14355-1)	Nessus	SuSE Local Security Checks	2021/6/10	2023/12/26	critical
199441	RHEL 8 : vino (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	2024/6/3	2024/6/3	high

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