安全性修正：

  - ntp：使用高度可預測之傳輸時間戳記的 ntpd 可導致時間變更或 DoS (CVE-2020-13817)

  - ntp：使用伺服器模式封包的用戶端 ntpd 上存在 DoS (CVE-2020-11868)

遠端 Redhat Enterprise Linux 7 主機上安裝的套件受到 RHSA-2020: 2663 公告中提及的多個弱點影響。

  - ntp：使用伺服器模式封包的用戶端 ntpd 上存在 DoS (CVE-2020-11868)

  - ntp：使用高度可預測之傳輸時間戳記的 ntpd 可導致時間變更或 DoS (CVE-2020-13817)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

在網路時間通訊協定 (NTP) 4.2.8p14 之前版本以及 4.3.x 版的 4.3.100 之前版本中，ntpd 允許遠端攻擊者預測用於偽造封包的傳輸時間戳記，進而造成拒絕服務 (程序結束或系統時間變更)。受害者必須仰賴未經驗證的 IPv4 時間來源。必須要有路徑外攻擊者能夠從受害者的 ntpd 執行個體中查詢時間。(CVE-2020-13817)

影響

攻擊者若能以偽造的上游伺服器的 IPv4 位址傳送大量封包，則可利用此瑕疵，以有限的數量修改受害者的時鐘，或造成 ntpd 結束。

BIG-IP

只有當您將 BIG-IP 系統設定為 NTP 伺服器，並且 BIG-IP 系統的時間來源為不可靠且未經驗證的上游 NTP 伺服器時，您的 BIG-IP 系統才會受到影響。

BIG-IQ

BIG-IQ 系統不會直接受到此弱點影響，但會從 BIG-IP 系統繼承該弱點。

遠端主機上安裝的 AOS 版本低於 5.17.1.5。因此，它受到 NXSA-AOS-5.17.1.5 公告中所提及的多個弱點影響。

  - 在 4.14.11 版之前的 Linux 核心中發現一個問題。kernel/trace/trace.c 檔案中的 allocate_trace_buffer 函式可能導致雙重釋放。(CVE-2017-18595)

  - 在 Linux 核心 5.4.0-rc2 中，kernel/trace/blktrace.c 中的  __blk_add_trace 函式存在釋放後使用 (讀取) 問題 (此函式用於填充 blk_io_trace 結構，置於 per-cpu sub-buffer 中)。(CVE-2019-19768)

  - 在 Linux 核心 5.7 版本之前的 SELinux 子系統中發現 NULL 指標解除參照缺陷。
    此缺陷會在透過「ebitmap_netlbl_import」常式將商業 IP 安全性選項 (CIPSO) 通訊協定的類別點陣圖匯入 SELinux 可延伸點陣圖時發生。在處理「cipso_v4_parsetag_rbm」常式中的 CIPSO 受限點陣圖標籤時，其會設定安全性屬性以指示類別點陣圖存在，即使尚未配置也是如此。將相同類別的點陣圖匯入 SELinux 時，此問題會導致 NULL 指標解除參照問題。遠端網路使用者可利用此缺陷損毀系統核心，進而導致拒絕服務。(CVE-2020-10711)

  在 dbus 1.3.0 至 1.12.18 (不含) 中發現一個問題。用於 dbus-daemon 的 libdbus 中，DBusServer 會在訊息超過每條訊息的檔案描述符號限制時，洩漏檔案描述符號。本機攻擊者具有 D-Bus 系統匯流排或其他系統服務私人 AF_UNIX 通訊端存取權，則可利用此弱點使系統服務達到其檔案描述符號限制，進而拒絕向後續 D-Bus 用戶端提供服務。(CVE-2020-12049)

  - Oracle Java SE 的 Java SE、Java SE Embedded 產品中的弱點 (元件：Libraries)。受影響的支援版本是 Java SE：8u251、11.0.7 和 14.0.1；Java SE Embedded：8u251。攻擊此弱點具有難度，能夠透過多個通訊協定存取網路的未經驗證攻擊者可利用此弱點入侵 Java SE、Java SE Embedded。若成功攻擊此弱點，未經授權即可更新、插入或刪除某些 Java SE、Java SE Embedded 可存取資料，以及未經授權讀取 Java SE、Java SE Embedded 可存取資料的子集。注意：適用於 Java 的用戶端和伺服器部署。可以透過沙箱化 Java Web Start 應用程式和沙箱化 Java applet 利用此弱點。也可以透過提供資料給指定元件的 API 來利用此弱點，而不使用沙箱環境中的 Java Web Start 應用程式或是沙箱環境中的 Java Applet (例如透過 Web 服務) 。(CVE-2020-14556)

  - Oracle Java SE 的 Java SE、Java SE Embedded 產品中的弱點 (元件：JSSE)。受影響的支援版本是 Java SE：7u261、8u251、 11.0.7 和 14.0.1； Java SE Embedded：8u251。
    難以惡意利用的弱點允許具有網路存取權的未經驗證攻擊者透過 TLS 來危害 Java SE、Java SE Embedded。若成功攻擊此弱點，未經授權即可讀取 Java SE、Java SE Embedded 可存取資料的子集。注意：適用於 Java 的用戶端和伺服器部署。可以透過沙箱化 Java Web Start 應用程式和沙箱化 Java applet 利用此弱點。也可以透過提供資料給指定元件的 API 來利用此弱點，而不使用沙箱環境中的 Java Web Start 應用程式或是沙箱環境中的 Java Applet (例如透過 Web 服務) 。(CVE-2020-14577)

  - Oracle Java SE 的 Java SE、Java SE Embedded 產品中的弱點 (元件：Libraries)。受影響的支援版本是 Java SE：7u261 和 8u251；Java SE Embedded：8u251。攻擊此弱點具有難度，能夠透過多個通訊協定存取網路的未經驗證攻擊者可利用此弱點入侵 Java SE、Java SE Embedded。若成功攻擊此弱點，未經授權即可造成 Java SE、Java SE Embedded 部分拒絕服務 (部分 DOS)。注意：適用於 Java 的用戶端和伺服器部署。可以透過沙箱化 Java Web Start 應用程式和沙箱化 Java applet 利用此弱點。也可以透過提供資料給指定元件的 API 來利用此弱點，而不使用沙箱環境中的 Java Web Start 應用程式或是沙箱環境中的 Java Applet (例如透過 Web 服務) 。(CVE-2020-14578、CVE-2020-14579)

  - Oracle Java SE 的 Java SE、Java SE Embedded 產品中的弱點 (元件：Libraries)。受影響的支援版本是 Java SE：7u261、8u251、 11.0.7 和 14.0.1； Java SE Embedded：8u251。
    攻擊此弱點具有難度，能夠透過多個通訊協定存取網路的未經驗證攻擊者可利用此弱點入侵 Java SE、Java SE Embedded。若要成功攻擊，必須有攻擊者以外之他人的互動，且雖然弱點位於 Java SE、Java SE Embedded 中，但攻擊可能對其他產品造成重大影響。成功攻擊此弱點可導致接管 Java SE、Java SE Embedded。注意：此弱點適用於 Java 部署，通常是在執行沙箱 Java Web Start 應用程式或沙箱 Java Applet 的用戶端中，這種部署會載入並執行不受信任的程式碼 (例如，來自網際網路的程式碼)，並依賴 Java 沙箱獲得安全性。此弱點不適用於僅載入並執行受信任程式碼 (例如，系統管理員安裝的程式碼) 的 Java 部署，此部署通常在伺服器中。(CVE-2020-14583)

  - Oracle Java SE 的 Java SE、Java SE Embedded 產品中的弱點 (元件：2D)。受影響的支援版本是 Java SE：7u261、8u251、 11.0.7 和 14.0.1； Java SE Embedded：8u251。此弱點較易攻擊，能夠透過多個通訊協定存取網路的未經驗證攻擊者可藉此入侵 Java SE、Java SE Embedded。若要成功攻擊，必須有攻擊者以外之他人的互動，且雖然弱點位於 Java SE、Java SE Embedded 中，但攻擊可能對其他產品造成重大影響。成功攻擊此弱點可導致未經授權地建立、刪除或修改重要資料或所有可供存取之 Java SE、Java SE Embedded 資料的存取權。注意：
    此弱點適用於 Java 部署，通常是在執行沙箱 Java Web Start 應用程式或沙箱 Java Applet 的用戶端中，這種部署會載入並執行不受信任的程式碼 (例如，來自網際網路的程式碼)，並依賴 Java 沙箱獲得安全性。此弱點不適用於僅載入並執行受信任程式碼 (例如，系統管理員安裝的程式碼) 的 Java 部署，此部署通常在伺服器中。(CVE-2020-14593)

  - Oracle Java SE 的 Java SE、Java SE Embedded 產品中的弱點 (元件：JAXP)。受影響的支援版本是 Java SE：7u261、8u251、 11.0.7 和 14.0.1； Java SE Embedded：8u251。此弱點較易攻擊，能夠透過多個通訊協定存取網路的未經驗證攻擊者可藉此入侵 Java SE、Java SE Embedded。若成功攻擊此弱點，未經授權即可更新、插入或刪除部分 Java SE、Java SE Embedded 可存取資料。注意：此弱點僅可透過以下方式遭到惡意利用：提供資料給指定元件中的 API，而不使用未受信任的 Java Web Start 應用程式或是未受信任的 Java Applet，如透過 Web 服務。
    (CVE-2020-14621)

  - 在 ntp 4.2.8p14 之前版本和 4.3.100 之前的 4.3.x 版中，off-path 攻擊者可利用 ntpd，透過具有偽造來源 IP 位址的伺服器模式封包封鎖未經驗證的同步，這是即使封包缺少有效的原始時間戳記，傳輸還是會重新排程所致。(CVE-2020-11868)

  - 在 ntp 4.2.8p14 之前版本和 4.3.100 的 4.3.x 之前版本中，ntpd 允許遠端攻擊者預測用於偽造封包的傳輸時間戳記，進而造成拒絕服務 (程序結束或系統時間變更)。受害者必須仰賴未經驗證的 IPv4 時間來源。必須要有路徑外攻擊者能夠從受害者的 ntpd 執行個體中查詢時間。(CVE-2020-13817)

  - 在 5.6.13 之前的 Linux 核心中，VFIO PCI 驅動程式未正確處理存取已停用記憶體空間的嘗試。(CVE-2020-12888)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

According to the versions of the ntp packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100     allows remote attackers to cause a denial of service     (daemon exit or system time change) by predicting     transmit timestamps for use in spoofed packets. The     victim must be relying on unauthenticated IPv4 time     sources. There must be an off-path attacker who can     query time from the victim's ntpd     instance.(CVE-2020-13817)

  - ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100     allows an off-path attacker to block unauthenticated     synchronization via a server mode packet with a spoofed     source IP address, because transmissions are     rescheduled even when a packet lacks a valid origin     timestamp.(CVE-2020-11868)

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.

Security Fix(es) :

  - ntp: ntpd using highly predictable transmit timestamps     could result in time change or DoS (CVE-2020-13817)

  - ntp: DoS on client ntpd using server mode packet     (CVE-2020-11868)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:2663 advisory.

  - ntp: DoS on client ntpd using server mode packet (CVE-2020-11868)

  - ntp: ntpd using highly predictable transmit timestamps could result in time change or DoS (CVE-2020-13817)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for ntp fixes the following issues :

ntp was updated to 4.2.8p15

CVE-2020-11868: Fixed an issue which a server mode packet with spoofed source address frequently send to the client ntpd could have caused denial of service (bsc#1169740).

CVE-2018-8956: Fixed an issue which could have allowed remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via spoofed mode 3 and mode 5 packets (bsc#1171355).

CVE-2020-13817: Fixed an issue which an off-path attacker with the ability to query time from victim's ntpd instance could have modified the victim's clock by a limited amount (bsc#1172651).

CVE-2020-15025: Fixed an issue which remote attacker could have caused denial of service by consuming the memory when a CMAC key was used andassociated with a CMAC algorithm in the ntp.keys (bsc#1173334).

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 ntpd in the network time protocol (NTP) before 4.2.8p14, and in 4.3.x before 4.3.100, allows remote attackers to cause a denial-of-service (DoS), either daemon exit or system time change, by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance.(CVE-2020-13817)

Impact

An attacker who can send a large number of packets with the spoofed IPv4 address of the upstream server can use this flaw to modify the victim's clock by a limited amount or cause ntpd to exit.

BIG-IP

Your BIG-IP system is affected only when you configure it as an NTP server, and sources for the BIG-IP system's time are unreliable, unauthenticated, upstream NTP servers.

BIG-IQ

The BIG-IQ system is not directly affected by this vulnerability, but it inherits the vulnerability from the BIG-IP system.

The version of AOS installed on the remote host is prior to 5.17.1.5. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AOS-5.17.1.5 advisory.

  - An issue was discovered in the Linux kernel before 4.14.11. A double free may be caused by the function     allocate_trace_buffer in the file kernel/trace/trace.c. (CVE-2017-18595)

  - In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the __blk_add_trace function in     kernel/trace/blktrace.c (which is used to fill out a blk_io_trace structure and place it in a per-cpu sub-     buffer). (CVE-2019-19768)

  - A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7.
    This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into     the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO     restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate     that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer     dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network     user to crash the system kernel, resulting in a denial of service. (CVE-2020-10711)

  - An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-     daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local     attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use     this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus     clients. (CVE-2020-12049)

  - Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Libraries). Supported     versions that are affected are Java SE: 8u251, 11.0.7 and 14.0.1; Java SE Embedded: 8u251. Difficult to     exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to     compromise Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in unauthorized     update, insert or delete access to some of Java SE, Java SE Embedded accessible data as well as     unauthorized read access to a subset of Java SE, Java SE Embedded accessible data. Note: Applies to client     and server deployment of Java. This vulnerability can be exploited through sandboxed Java Web Start     applications and sandboxed Java applets. It can also be exploited by supplying data to APIs in the     specified Component without using sandboxed Java Web Start applications or sandboxed Java applets, such as     through a web service. (CVE-2020-14556)

  - Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: JSSE). Supported     versions that are affected are Java SE: 7u261, 8u251, 11.0.7 and 14.0.1; Java SE Embedded: 8u251.
    Difficult to exploit vulnerability allows unauthenticated attacker with network access via TLS to     compromise Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in unauthorized     read access to a subset of Java SE, Java SE Embedded accessible data. Note: Applies to client and server     deployment of Java. This vulnerability can be exploited through sandboxed Java Web Start applications and     sandboxed Java applets. It can also be exploited by supplying data to APIs in the specified Component     without using sandboxed Java Web Start applications or sandboxed Java applets, such as through a web     service. (CVE-2020-14577)

  - Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Libraries). Supported     versions that are affected are Java SE: 7u261 and 8u251; Java SE Embedded: 8u251. Difficult to exploit     vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise     Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in unauthorized ability to     cause a partial denial of service (partial DOS) of Java SE, Java SE Embedded. Note: Applies to client and     server deployment of Java. This vulnerability can be exploited through sandboxed Java Web Start     applications and sandboxed Java applets. It can also be exploited by supplying data to APIs in the     specified Component without using sandboxed Java Web Start applications or sandboxed Java applets, such as     through a web service. (CVE-2020-14578, CVE-2020-14579)

  - Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Libraries). Supported     versions that are affected are Java SE: 7u261, 8u251, 11.0.7 and 14.0.1; Java SE Embedded: 8u251.
    Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple     protocols to compromise Java SE, Java SE Embedded. Successful attacks require human interaction from a     person other than the attacker and while the vulnerability is in Java SE, Java SE Embedded, attacks may     significantly impact additional products. Successful attacks of this vulnerability can result in takeover     of Java SE, Java SE Embedded. Note: This vulnerability applies to Java deployments, typically in clients     running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code     (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability     does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code     installed by an administrator). (CVE-2020-14583)

  - Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: 2D). Supported     versions that are affected are Java SE: 7u261, 8u251, 11.0.7 and 14.0.1; Java SE Embedded: 8u251. Easily     exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to     compromise Java SE, Java SE Embedded. Successful attacks require human interaction from a person other     than the attacker and while the vulnerability is in Java SE, Java SE Embedded, attacks may significantly     impact additional products. Successful attacks of this vulnerability can result in unauthorized creation,     deletion or modification access to critical data or all Java SE, Java SE Embedded accessible data. Note:
    This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start     applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the     internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java     deployments, typically in servers, that load and run only trusted code (e.g., code installed by an     administrator). (CVE-2020-14593)

  - Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: JAXP). Supported     versions that are affected are Java SE: 7u261, 8u251, 11.0.7 and 14.0.1; Java SE Embedded: 8u251. Easily     exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to     compromise Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in unauthorized     update, insert or delete access to some of Java SE, Java SE Embedded accessible data. Note: This     vulnerability can only be exploited by supplying data to APIs in the specified Component without using     Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service.
    (CVE-2020-14621)

  - ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated     synchronization via a server mode packet with a spoofed source IP address, because transmissions are     rescheduled even when a packet lacks a valid origin timestamp. (CVE-2020-11868)

  - ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service     (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The     victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can     query time from the victim's ntpd instance. (CVE-2020-13817)

  - The VFIO PCI driver in the Linux kernel through 5.6.13 mishandles attempts to access disabled memory     space. (CVE-2020-12888)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
137773	Scientific Linux 安全性更新：SL7.x x86_64 上的 ntp (20200623)	Nessus	Scientific Linux Local Security Checks	6/24/2020	6/29/2020	high
137828	RHEL 7：ntp (RHSA-2020: 2663)	Nessus	Red Hat Local Security Checks	6/25/2020	5/25/2023	high
145255	F5 Networks BIG-IP：NTP 弱點 (K55376430)	Nessus	F5 Networks Local Security Checks	1/22/2021	11/2/2023	high
164579	Nutanix AOS：多個弱點 (NXSA-AOS-5.17.1.5)	Nessus	Misc.	9/1/2022	1/11/2024	high
164595	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.18)	Nessus	Misc.	9/1/2022	3/13/2024	critical
164596	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.15.3)	Nessus	Misc.	9/1/2022	6/21/2024	critical
139996	EulerOS Virtualization for ARM 64 3.0.6.0 : ntp (EulerOS-SA-2020-1893)	Nessus	Huawei Local Security Checks	8/28/2020	2/22/2024	high
137773	Scientific Linux Security Update : ntp on SL7.x x86_64 (20200623)	Nessus	Scientific Linux Local Security Checks	6/24/2020	6/29/2020	high
137828	RHEL 7 : ntp (RHSA-2020:2663)	Nessus	Red Hat Local Security Checks	6/25/2020	5/25/2023	high
138311	SUSE SLES12 Security Update : ntp (SUSE-SU-2020:1805-1)	Nessus	SuSE Local Security Checks	7/9/2020	1/13/2021	high
145255	F5 Networks BIG-IP : NTP vulnerabilities (K55376430)	Nessus	F5 Networks Local Security Checks	1/22/2021	11/2/2023	high
164579	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.17.1.5)	Nessus	Misc.	9/1/2022	1/11/2024	high

Detections

Analytics

Plugins Search

high

high

high

high

critical

critical

high

high

high

high

high

high