Isaac Boukris and Andrew Bartlett discovered that the S4U2Self Kerberos extension used in Samba's Active Directory support was susceptible to man-in-the-middle attacks caused by incomplete checksum validation.

For Debian 8 'Jessie', this problem has been fixed in version 2:4.2.14+dfsg-0+deb8u13.

We recommend that you upgrade your samba 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.

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

  - A flaw was found in samba's Heimdal KDC implementation,     versions 4.8.x up to, excluding 4.8.12, 4.9.x up to,     excluding 4.9.8 and 4.10.x up to, excluding 4.10.3,     when used in AD DC mode. A man in the middle attacker     could use this flaw to intercept the request to the KDC     and replace the user name (principal) in the request     with any desired user name (principal) that exists in     the KDC effectively obtaining a ticket for that     principal.(CVE-2018-16860)

  - All Samba versions 4.x.x before 4.9.17, 4.10.x before     4.10.11 and 4.11.x before 4.11.3 have an issue, where     the (poorly named) dnsserver RPC pipe provides     administrative facilities to modify DNS records and     zones. Samba, when acting as an AD DC, stores DNS     records in LDAP. In AD, the default permissions on the     DNS partition allow creation of new records by     authenticated users. This is used for example to allow     machines to self-register in DNS. If a DNS record was     created that case-insensitively matched the name of the     zone, the ldb_qsort() and dns_name_compare() routines     could be confused into reading memory prior to the list     of DNS entries when responding to DnssrvEnumRecords()     or DnssrvEnumRecords2() and so following invalid memory     as a pointer.(CVE-2019-14861)

  - All Samba versions 4.x.x before 4.9.17, 4.10.x before     4.10.11 and 4.11.x before 4.11.3 have an issue, where     the S4U (MS-SFU) Kerberos delegation model includes a     feature allowing for a subset of clients to be opted     out of constrained delegation in any way, either     S4U2Self or regular Kerberos authentication, by forcing     all tickets for these clients to be non-forwardable. In     AD this is implemented by a user attribute     delegation_not_allowed (aka not-delegated), which     translates to disallow-forwardable. However the Samba     AD DC does not do that for S4U2Self and does set the     forwardable flag even if the impersonated client has     the not-delegated flag set.(CVE-2019-14870)

  - A flaw was found in the samba client, all samba     versions before samba 4.11.2, 4.10.10 and 4.9.15, where     a malicious server can supply a pathname to the client     with separators. This could allow the client to access     files and folders outside of the SMB network pathnames.
    An attacker could use this vulnerability to create     files outside of the current working directory using     the privileges of the client user.(CVE-2019-10218)

  - A flaw was found in the way an LDAP search expression     could crash the shared LDAP server process of a samba     AD DC. An authenticated user, having read permissions     on the LDAP server, could use this flaw to cause denial     of service.(CVE-2019-3824)

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 host is running Mac OS X 10.12.6 or Mac OS X 10.13.6 and is missing a security update. It is, therefore, affected by multiple vulnerabilities :

  - An application may be able to read restricted memory     (CVE-2019-8691, CVE-2019-8692, CVE-2019-8693)

  - Extracting a zip file containing a symbolic link to an     endpoint in an NFS mount that is attacker controlled may     bypass Gatekeeper (CVE-2019-8656)

  - A remote attacker may be able to cause arbitrary code     execution (CVE-2019-8648, CVE-2018-19860, CVE-2019-8661)

  - A remote attacker may be able to leak memory     (CVE-2019-8646, CVE-2019-8663)

  - A remote attacker may be able to cause unexpected     application termination or arbitrary code execution     ( CVE-2019-8641, CVE-2019-8660)

  - An application may be able to execute arbitrary code     with system privileges (CVE-2019-8695, CVE-2019-8697)

  - An issue existed in Samba that may allow attackers to     perform unauthorized actions by intercepting     communications between services (CVE-2018-16860)

  - An application may be able to execute arbitrary code     with kernel privileges (CVE-2019-8694)

  - A remote attacker may be able to view sensitive     information (CVE-2019-13118)

  - An attacker may be able to trigger a use-after-free in     an application deserializing an untrusted NSDictionary     (CVE-2019-8662)

  - Visiting a malicious website may lead to address bar     spoofing (CVE-2019-8670)

  - The encryption status of a Time Machine backup may be     incorrect (CVE-2019-8667)

  - Parsing a maliciously crafted office document may lead     to an unexpected application termination or arbitrary     code execution (CVE-2019-8657)

  - Processing maliciously crafted web content may lead to     universal cross site scripting (CVE-2019-8649,     CVE-2019-8658, CVE-2019-8690)

  - Processing maliciously crafted web content may lead to     arbitrary code execution (CVE-2019-8644, CVE-2019-8666,     CVE-2019-8669, CVE-2019-8671, CVE-2019-8672,     CVE-2019-8673, CVE-2019-8676, CVE-2019-8677,     CVE-2019-8678, CVE-2019-8679, CVE-2019-8680,     CVE-2019-8681, CVE-2019-8683, CVE-2019-8684,     CVE-2019-8685, CVE-2019-8686, CVE-2019-8687,     CVE-2019-8688, CVE-2019-8689)

Note that Nessus has not tested for this issue but has instead relied only on the operating system's self-reported version number.

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5675-1 advisory.

    Isaac Boukris and Andrew Bartlett discovered that Heimdal's KDC was not properly performing checksum     algorithm verifications in the S4U2Self extension module. An attacker could possibly use this issue to     perform a machine-in-the-middle attack and request S4U2Self tickets for any user known by the application.
    This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM and Ubuntu 18.04 LTS. (CVE-2018-16860)

    It was discovered that Heimdal was not properly handling the verification of key exchanges when an     anonymous PKINIT was being used. An attacker could possibly use this issue to perform a machine-in-the-     middle attack and expose sensitive information. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04     ESM and Ubuntu 18.04 LTS. (CVE-2019-12098)

    Joseph Sutton discovered that Heimdal was not properly handling memory management operations when dealing     with TGS-REQ tickets that were missing information. An attacker could possibly use this issue to cause a     denial of service. (CVE-2021-3671)

    Micha Kpie discovered that Heimdal was not properly handling logical conditions that related to     memory management operations. An attacker could possibly use this issue to cause a denial of service.
    (CVE-2022-3116)

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.

USN-3976-1 修正了 Samba 中的弱點。此更新提供 Ubuntu 12.04 ESM 和 Ubuntu 14.04 ESM 的對應更新。

原始公告詳細資料：

Isaac Boukris 和 Andrew Bartlett 發現 Samba 未正確檢查 S4U2Self 封包。在特定環境下，遠端攻擊者可能利用此問題提升權限。

請注意，Tenable Network Security 已直接從 Ubuntu 安全性公告擷取前置描述區塊。Tenable 已嘗試在不造成其他問題的前提下，盡可能完成自動清理並將其格式化。

Isaac Boukris 和 Andrew Bartlett 發現，Samba　的　Active Directory　支援中使用的　S4U2Self Kerberos　延伸模組容易受到不完整的總和檢查碼驗證所導致的攔截式攻擊。針對 Debian 8「Jessie」，此問題已在 2:4.2.14+dfsg-0+deb8u13 版本中修正。建議您升級 samba 套件。注意：Tenable Network Security 已直接從 DLA 安全性公告擷取前置描述區塊。Tenable 已盡量在不造成其他問題的前提下，嘗試自動清理並將其格式化。

遠端主機執行的是 Mac OS X 10.12.6 或 Mac OS X 10.13.6 且缺少安全性更新。因此，會受到多個弱點影響：- 應用程式可能可以讀取受限制的記憶體 (CVE-2019-8691、CVE-2019-8692、CVE-2019-8693) - 將含有符號連結的壓縮檔解壓縮到由攻擊者控制的 NFS 裝載可能會繞過 Gatekeeper (CVE-2019-8656) - 遠端攻擊者可能可以造成任意程式碼執行 (CVE-2019-8648、CVE-2018-19860、CVE-2019-8661) - 遠端攻擊者可能可以洩露記憶體 (CVE-2019-8646、CVE-2019-8663) - 遠端攻擊者可能可以造成非預期的應用程式終止或任意程式碼執行 (CVE-2019-8641、CVE-2019-8660) - 應用程式可能可以用系統權限執行任意程式碼 (CVE-2019-8695、CVE-2019-8697) - Samba 中有一個問題存在，攻擊者可能藉以透過攔截服務之間的通訊，來執行未獲授權的動作 (CVE-2018-16860) - 應用程式可能可以用核心權限執行任意程式碼 (CVE-2019-8694) - 遠端攻擊者可能可以檢視敏感資訊 (CVE-2019-13118) - 攻擊者可能可以在將未受信任的 NSDictionary 還原序列化時，在應用程式中觸發釋放後使用 (CVE-2019-8662) - 造訪惡意的網站可能會導致位址列偽造 (CVE-2019-8670) - Time Machine 備份的加密狀態可能不正確 (CVE-2019-8667) - 剖析惡意特製的 office 文件可能導致應用程式意外終止，或任意程式碼執行 (CVE-2019-8657) - 處理惡意特製的網站內容可能導致全域跨網站指令碼 (CVE-2019-8649、CVE-2019-8658、CVE-2019-8690) - 處理惡意特製的網站內容可能導致任意程式碼執行 (CVE-2019-8644、CVE-2019-8666、CVE-2019-8669、CVE-2019-8671、CVE-2019-8672、CVE-2019-8673、CVE-2019-8676、CVE-2019-8677、CVE-2019-8678、CVE-2019-8679、CVE-2019-8680、CVE-2019-8681、CVE-2019-8683、CVE-2019-8684、CVE-2019-8685、CVE-2019-8686、CVE-2019-8687、CVE-2019-8688、CVE-2019-8689) 請注意，Nessus 並未測試此問題，而是僅依據作業系統自我報告的版本號碼。

遠端 Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS 主機上安裝的多個套件受到 USN-5675-1 公告中提及的多個弱點影響。

  - samba 的 Heimdal KDC 實作在 AD DC 模式下使用時存在問題，此問題影響 4.8.x 至 4.8.12 版 (不含)、4.9.x 至 4.9.8 版 (不含) 和 4.10.x 至 4.10.3 版 (不含)。攔截式攻擊者可利用此問題攔截對 KDC 的要求，並將要求中的使用者名稱 (主體) 替換為 KDC 中存在的任何所需使用者名稱 (主體)，進而有效取得該主體的票證。(CVE-2018-16860)

  - 在 Heimdal 7.6.0 之前版本的用戶端中，因爲無法驗證匿名 PKINIT PA-PKINIT-KX 金鑰交換，所以會引致攔截式攻擊。此問題位於 lib/krb5/init_creds_pw.c 的 krb5_init_creds_step 中。
    (CVE-2019-12098)

  - 在 samba kerberos 伺服器處理 TGS-REQ (工單授予伺服器 - 要求) 中遺漏的 sname 的方式中發現 null 指標解除參照缺陷。經過驗證的使用者可利用此缺陷造成伺服器當機。
    (CVE-2021-3671)

  - Heimdal Software Kerberos 5 實作容易受到 Null 指標解除參照攻擊。攻擊者若能透過網路存取依賴有弱點之程式碼路徑的應用程式，則可造成應用程式損毀。(CVE-2022-3116)

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。

Isaac Boukris 和 Andrew Bartlett 发现，Samba 的 Active Directory 支持中使用的 S4U2Self Kerberos 扩展容易受到不完整的校验和验证造成的中间人攻击。对于 Debian 8“Jessie”，这一问题已在 2:4.2.14+dfsg-0+deb8u13 版本中修复。我们建议您升级 samba 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，尽可能进行自动整理和排版。

USN-3976-1 修复了 Samba 中的漏洞。此更新提供针对 Ubuntu 12.04 ESM 和 Ubuntu 14.04 ESM 的相应更新。

原始公告详细信息：

Isaac Boukris 和 Andrew Bartlett 发现 Samba 未正确检查 S4U2Self 数据包。在特定环境中，远程攻击者可能利用此问题升级权限。

请注意，Tenable Network Security 已直接从 Ubuntu 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了自动清理和排版。

远程主机正在运行 Mac OS X 10.12.6 或 Mac OS X 10.13.6 且缺少安全更新。因而会受到多个漏洞的影响：- 应用程序可以读取受限制的内存 (CVE-2019-8691, CVE-2019-8692, CVE-2019-8693) - 将包含符号链接的 zip 文件解压缩至受攻击者控制的 NFS 挂载端点可能会绕过 Gatekeeper (CVE-2019-8656) - 远程攻击者可能会导致任意代码执行 (CVE-2019-8648, CVE-2018-19860, CVE-2019-8661) - 远程攻击者可能会泄露内存 (CVE-2019-8646, CVE-2019-8663) - 远程攻击者可能会导致应用程序意外终止或任意代码执行 (CVE-2019-8641, CVE-2019-8660) - 应用程序可能以系统权限执行任意代码 (CVE-2019-8695, CVE-2019-8697) - Samba 中的问题可允许攻击者通过拦截服务间的通信，执行未经授权的操作 (CVE-2018-16860) - 应用程序可能以内核权限执行任意代码 (CVE-2019-8694) - 远程攻击者可能会查看敏感信息 (CVE-2019-13118) - 攻击者可能会在反序列化不受信任 NSDictionary 的应用程序中触发释放后使用 (CVE-2019-8662) - 访问恶意网站可能会导致地址栏伪造 (CVE-2019-8670) - Time Machine 备份的加密状态可能不正确 (CVE-2019-8667) - 解析恶意构建的 office 文档可能会导致应用程序意外终止或任意代码执行 (CVE-2019-8657) - 处理恶意构建的 Web 内容可能会导致通用跨站脚本 (CVE-2019-8649, CVE-2019-8658, CVE-2019-8690) - 处理恶意构建的 Web 内容可能会导致任意代码执行 (CVE-2019-8644, CVE-2019-8666, CVE-2019-8669, CVE-2019-8671, CVE-2019-8672, CVE-2019-8673, CVE-2019-8676, CVE-2019-8677, CVE-2019-8678, CVE-2019-8679, CVE-2019-8680, CVE-2019-8681, CVE-2019-8683, CVE-2019-8684, CVE-2019-8685, CVE-2019-8686, CVE-2019-8687, CVE-2019-8688, CVE-2019-8689) 请注意，Nessus 并未测试此问题，而是仅依据操作系统自我报告的版本号码。

远程 Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS 主机上安装的多个程序包受到 USN-5675-1 公告中提及的多个漏洞影响。

  - 在 AD DC 模式下使用时，samba 的 Heimdal KDC 实现版本为低于 4.8.12 的 4.8.x，低于 4.9.8 的 4.9.x 和低于 4.10.3 的 4.10.x。中间人攻击者可利用此缺陷拦截对 KDC 的请求，并将请求中的用户名（主体）替换为 KDC 中存在的任何所需用户名（主体），从而有效地获取该主体的票证。(CVE-2018-16860)

  - 在版本低于 7.6.0 的 Heimdal 客户端中，无法验证匿名 PKINIT PA-PKINIT-KX 密钥交换允许中间人攻击。此问题存在于 lib/krb5/init_creds_pw.c 的 krb5_init_creds_step 中。
    (CVE-2019-12098)

  - 在 samba kerberos 服务器处理 TGS-REQ（工单授予服务器 - 请求）中缺失的 sname 的方式中发现空指针取消引用漏洞。经过身份验证的用户可使用此缺陷导致服务器崩溃。
    (CVE-2021-3671)

  - Heimdal Software Kerberos 5 实现容易受到空指针取消引用的影响。对依赖有漏洞的代码路径的应用程序具有网络访问权限的攻击者可导致应用程序崩溃。(CVE-2022-3116)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

ID	Name	Product	Family	Published	Updated	Severity
125174	Debian DLA-1788-1 : samba security update	Nessus	Debian Local Security Checks	5/16/2019	5/22/2024	high
132625	EulerOS 2.0 SP8 : samba (EulerOS-SA-2020-1032)	Nessus	Huawei Local Security Checks	1/2/2020	5/18/2022	high
127055	macOS Sierra / High Sierra Multiple Vulnerabilities (Security Update 2019-004)	Nessus	MacOS X Local Security Checks	7/26/2019	5/28/2024	critical
166109	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : Heimdal vulnerabilities (USN-5675-1)	Nessus	Ubuntu Local Security Checks	10/14/2022	8/27/2024	high
125135	Ubuntu 14.04 LTS：samba 弱點 (USN-3976-2)	Nessus	Ubuntu Local Security Checks	5/15/2019	5/22/2024	high
125174	Debian DLA-1788-1：samba 安全性更新	Nessus	Debian Local Security Checks	5/16/2019	5/22/2024	high
127055	macOS 和 Mac OS X 多個弱點 (安全性更新 2019-004)	Nessus	MacOS X Local Security Checks	7/26/2019	5/28/2024	critical
166109	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS：Heimdal 弱點 (USN-5675-1)	Nessus	Ubuntu Local Security Checks	10/14/2022	8/27/2024	high
125174	Debian DLA-1788-1：samba - 安全更新	Nessus	Debian Local Security Checks	5/16/2019	5/22/2024	high
125135	Ubuntu 14.04 LTS：samba 漏洞 (USN-3976-2)	Nessus	Ubuntu Local Security Checks	5/15/2019	5/22/2024	high
127055	macOS 和 Mac OS X 多个漏洞（安全更新 2019-004）	Nessus	MacOS X Local Security Checks	7/26/2019	5/28/2024	critical
166109	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS：Heimdal 漏洞 (USN-5675-1)	Nessus	Ubuntu Local Security Checks	10/14/2022	8/27/2024	high

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