執行 CORE 5.05 / MAIN 5.05 版的遠端 NewStart CGSL 主機上安裝的 libvncserver 套件受到多個弱點影響：

  -LibVNCServer 0.9.12 之前版本中的 libvncclient/cursor.c 透過大的高度或寬度值，會造成 HandleCursorShape 整數溢位和堆積型緩衝區溢位問題。注意：這可能與 CVE-2019-15690 重疊。
    (CVE-2019-20788)

請注意，Nessus 並未測試此問題，而是僅依據應用程式自我報告的版本號碼。

安全性修正：

  - libvncserver：HandleCursorShape() 整數溢位，導致堆積型緩衝區溢位 (CVE-2019-15690)

變更描述：

[0.9.11-9.2]
- 啟用閘道 (錯誤 #1681199)

[0.9.11-9.1]
- 修正 CVE-2019-15690 (用戶端中 HandleCursorShape() 的整數溢位問題) (錯誤 #1814342)

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - LibVNCServer 0.9.12 和更舊版本的 libvncclient/cursor.c 的 HandleCursorShape() 函式內有堆積緩衝區溢位弱點。攻擊者傳送具有特製尺寸的游標形狀這可導致遠端程式碼執行。 (CVE-2019-15690)

請注意，Nessus 依賴供應商報告的套件存在。

In libvncserver, through libvncclient/cursor.c, there is a possibility of a heap overflow, as reported by Pavel Cheremushkin.

For Debian 8 'Jessie', this problem has been fixed in version 0.9.9+dfsg2-6.1+deb8u7.

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.

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).

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.

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:0920 advisory.

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

    Security Fix(es):

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

    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.

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.

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.

Pavel Cheremushkin氏の報告によれば、libvncserverのlibvncclient/cursor.cを通じて、ヒープオーバーフローの可能性があります。

Debian 8「Jessie」では、この問題はバージョン0.9.9+dfsg2-6.1+deb8u7で修正されました。

libvncserver パッケージをアップグレードすることを推奨します。

注: Tenable Network Securityは、前述の記述ブロックを DLA セキュリティアドバイザリから直接抽出しています。Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

LibVNCServer用のこの更新プログラムでは、以下の問題が修正されています：

CVE-2019-15690：ヒープバッファオーバーフローを修正しました（bsc#1160471）。

CVE-2019-15681：リモート攻撃者がスタックメモリを読み取る可能性のあるメモリリークを修正しました（bsc#1155419）。

CVE-2019-20788：大きな高さまたは幅の値を介した整数オーバーフローとヒープベースのバッファオーバーフローを修正しました（bsc#1170441）。

注意：Tenable Network Securityは、前述の記述ブロックをSUSEセキュリティアドバイザリから直接抽出しています。Tenableでは、そこに新しい問題を追加することはせずに、できる限り自動的に整理と書式設定をするようにしています。

このLibVNCServerの更新では、次の問題を修正します：

  - CVE-2019-15690：ヒープバッファオーバーフローを修正しました（bsc#1160471）。

  - CVE-2019-15681：リモート攻撃者がスタックメモリを読み取る可能性のあるメモリリークを修正しました（bsc#1155419）。

  - CVE-2019-20788：大きな高さまたは幅の値を介した整数オーバーフローとヒープベースのバッファオーバーフローを修正しました（bsc#1170441）。

この更新はSUSEからインポートされました：SLE-15：更新プロジェクトを更新します。

リモートの Redhat Enterprise Linux 8 ホストにインストールされているパッケージは、RHSA-2020: 0920アドバイザリに記載されている複数の脆弱性の影響を受けます。

  - libvncserver: ヒープベースのバッファオーバーフローを引き起こすHandleCursorShape()の整数オーバーフロー（CVE-2019-15690）

  - libvncserver: HandleCursorShape関数のlibvncclient/cursor.cの整数オーバーフローとヒープベースのバッファオーバーフロー（CVE-2019-20788）

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
143980	NewStart CGSL CORE 5.05 / MAIN 5.05：libvncserver 多個弱點 (NS-SA-2020-0087)	Nessus	NewStart CGSL Local Security Checks	2020/12/9	2024/2/5	critical
134847	Scientific Linux 安全性更新：SL7.x x86_64 上的 libvncserver (20200323)	Nessus	Scientific Linux Local Security Checks	2020/3/24	2025/1/27	high
134887	Oracle Linux 8：libvncserver (ELSA-2020-0920)	Nessus	Oracle Linux Local Security Checks	2020/3/25	2025/1/27	high
250522	Linux Distros 未修補的弱點：CVE-2019-15690	Nessus	Misc.	2025/8/18	2025/8/18	high
134633	Debian DLA-2146-1 : libvncserver security update	Nessus	Debian Local Security Checks	2020/3/18	2025/1/27	high
136396	SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2020:1165-1)	Nessus	SuSE Local Security Checks	2020/5/7	2024/3/13	critical
136453	openSUSE Security Update : LibVNCServer (openSUSE-2020-624)	Nessus	SuSE Local Security Checks	2020/5/11	2024/3/13	critical
138259	SUSE SLED15 / SLES15 Security Update : LibVNCServer (SUSE-SU-2020:1164-2)	Nessus	SuSE Local Security Checks	2020/7/9	2024/3/1	critical
143006	RHEL 8 : libvncserver (RHSA-2020:0920)	Nessus	Red Hat Local Security Checks	2020/11/18	2024/11/8	critical
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
134633	Debian DLA-2146-1 : libvncserver セキュリティ更新	Nessus	Debian Local Security Checks	2020/3/18	2025/1/27	high
136396	SUSE SLES12セキュリティ更新プログラム：LibVNCServer（SUSE-SU-2020:1165-1）	Nessus	SuSE Local Security Checks	2020/5/7	2024/3/13	critical
136453	openSUSEセキュリティ更新プログラム：LibVNCServer（openSUSE-2020-624）	Nessus	SuSE Local Security Checks	2020/5/11	2024/3/13	critical
138259	SUSE SLED15 / SLES15セキュリティ更新プログラム：LibVNCServer（SUSE-SU-2020:1164-2）	Nessus	SuSE Local Security Checks	2020/7/9	2024/3/1	critical
143006	RHEL 8: libvncserver（RHSA-2020: 0920)	Nessus	Red Hat Local Security Checks	2020/11/18	2024/11/8	critical

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