在 Samba 的 DCE/RPC 协议实现中发现多种缺陷。
经认证的远程攻击者可利用这些缺陷，对 Samba 服务器造成拒绝服务 (高 CPU 负载或崩溃)，或可能以运行 Samba 的用户的权限（根权限）执行任意代码。中间人攻击者也可利用此缺陷，通过控制 Active Directory (AD) 对象并危及 Samba Active Directory 域控制器 (DC) 的安全，将安全 DCE/RPC 连接降级。
(CVE-2015-5370)

在 Security Account Manager Remote 协议 (MS-SAMR) 和本地安全机构（域策略）远程协议 (MS-LSAD) 中发现一个通称为 Badlock 的协议缺陷。中间人攻击者可利用客户端针对服务器初始化的任何经认证的 DCE/RPC 连接，针对服务器上的 SAMR 或 LSA 服务冒充经认证的用户。
因此，攻击者能够获得 Security Account Manager 数据库的读/写权限，并利用此问题泄露该数据库中的所有密码或其他任何潜在的敏感信息。(CVE-2016-2118)

在 Samba 的 NTLMSSP 认证实现中发现多个缺陷。未经认证的中间人攻击者可利用此缺陷，清除连接的加密和完整性标记，进而造成以纯文本传输数据。即使针对该连接明确要求加密，攻击者也可强制客户端或服务器以纯文本发送数据。
(CVE-2016-2110)

已发现配置为域控制器的 Samba 会使用伪造的计算机名称，建立与设备的安全通信通道。能够观察网络流量的远程攻击者可利用此缺陷，取得关于伪造机器的会话相关信息。(CVE-2016-2111)

已发现 Samba 的 LDAP 实现未针对 LDAP 连接强制执行完整性保护。中间人攻击者可利用此缺陷，将 LDAP 连接降级为不使用完整性保护，进而允许其劫持此类连接。
(CVE-2016-2112)

已发现在某些连接中，Samba 不会验证 SSL/TLS 证书。中间人攻击者可利用此缺陷，使用特别构建的 SSL/TLS 证书欺骗 Samba 服务器。
(CVE-2016-2113)

已发现 Samba 不会强制服务器消息块 (SMB) 使用 SMB1 协议登录客户端。中间人攻击者可利用此缺陷修改客户端与服务器之间的流量。(CVE-2016-2114)

已发现 Samba 默认未针对 IPC 流量启用完整性保护。中间人攻击者可利用此缺陷，查看并修改在 Samba 服务器和客户端之间发送的数据。
(CVE-2016-2115)

在 Samba（适用于 Unix 的 SMB/CIFS 文件、打印及登录服务器）中发现多个漏洞。通用漏洞和暴露计划识别以下问题：

- CVE-2015-5370 Synopsys 的 Jouni Knuutinen 在 Samba DCE-RPC 代码中发现缺陷，其可导致拒绝服务（崩溃与高 CPU 消耗）和中间人攻击。

- CVE-2016-2110 SerNet 的 Stefan Metzmacher 和 Samba 团队发现 NTLMSSP 的功能协商无法对降级攻击提供保护。

- CVE-2016-2111 当 Samba 被配置为域控制器时，会允许远程攻击者伪造安全信道端点的计算机名称，并获取敏感会话信息。此缺陷对应于 Windows 的 CVE-2015-0005 相同漏洞，由 Core Security 的 Alberto Solino 发现。

- CVE-2016-2112 SerNet 的 Stefan Metzmacher 和 Samba 团队发现中间人攻击者可以降级 LDAP 连接，以避免完整性保护。

- CVE-2016-2113 SerNet 的 Stefan Metzmacher 和 Samba 团队发现可能会因为客户端触发的 LDAP 连接和 ncacn_http 连接造成中间人攻击。

- CVE-2016-2114 SerNet 的 Stefan Metzmacher 和 Samba 团队发现 Samba 不会强制执行的请求 smb 签名，即使已明确配置。

- CVE-2016-2115 SerNet 的 Stefan Metzmacher 和 Samba 团队发现 IPC 流量的 SMB 连接未受到完整性保护。

- CVE-2016-2118 SerNet 的 Stefan Metzmacher 和 Samba 团队发现中间人攻击者可以拦截客户端和服务器之间的任何 DCERPC 流量，藉以模拟客户端并取得与经认证的用户帐户相同的权限。

samba 更新现可用于 RHEL 6 的 Red Hat Gluster Storage 3.1 与 RHEL 7 的 Red Hat Gluster Storage 3.1。

Red Hat 产品安全团队已将此更新评级为具有重要安全影响。可从“参考”部分中的 CVE 链接获取通用漏洞评分系统 (CVSS) 基本分数，其针对每个漏洞给出了详细的严重性等级。

Samba 是服务器消息块 (SMB) 协议与相关通用 Internet 文件系统 (CIFS) 协议的开源实现，允许兼容 PC 的计算机共享文件、打印机和多种信息。

以下程序包已升级到更新的上游版本：
Samba (4.2.10)。有关完整的变更列表，请参阅“参考”部分中列出的发行说明。

安全补丁：

* 在 Samba 的 DCE/RPC 协议实现中发现多种缺陷。经认证的远程攻击者可利用这些缺陷，对 Samba 服务器造成拒绝服务 (高 CPU 负载或崩溃)，或可能以运行 Samba 的用户的权限（根权限）执行任意代码。中间人攻击者也可利用此缺陷，通过控制 Active Directory (AD) 对象并危及 Samba Active Directory 域控制器 (DC) 的安全，将安全 DCE/RPC 连接降级。
(CVE-2015-5370)

注意：虽然 Red Hat Gluster Storage 随附的 Samba 程序包不支持以 AD DC 运行 Samba，但此缺陷仍影响所有角色 Samba 实现。

* 在 Security Account Manager Remote 协议 (MS-SAMR) 和本地安全机构（域策略）远程协议 (MS-LSAD) 中发现一个协议缺陷，公开称为 Badlock。中间人攻击者可利用客户端针对服务器初始化的任何经认证的 DCE/RPC 连接，针对服务器上的 SAMR 或 LSA 服务冒充经认证的用户。
因此，攻击者能够获得 Security Account Manager 数据库的读/写权限，并利用此问题泄露该数据库中的所有密码或其他任何潜在的敏感信息。(CVE-2016-2118)

* 在 Samba 的 NTLMSSP 认证实现中发现多个缺陷。未经认证的中间人攻击者可利用此缺陷，清除连接的加密和完整性标记，进而造成以纯文本传输数据。即使针对该连接明确要求加密，攻击者也可强制客户端或服务器以纯文本发送数据。
(CVE-2016-2110)

* 发现配置为域控制器的 Samba 会使用伪造的计算机名称，建立与机器的安全通信通道。能够观察网络流量的远程攻击者可利用此缺陷，取得关于伪造机器的会话相关信息。(CVE-2016-2111)

* 发现 Samba 的 LDAP 实现未针对 LDAP 连接强制执行完整性保护。中间人攻击者可利用此缺陷，将 LDAP 连接降级为不使用完整性保护，进而允许其劫持此类连接。
(CVE-2016-2112)

* 已发现在某些连接中，Samba 不会验证 SSL/TLS 证书。中间人攻击者可利用此缺陷，使用特别构建的 SSL/TLS 证书欺骗 Samba 服务器。
(CVE-2016-2113)

* 已发现 Samba 不会强制服务器消息块 (SMB) 使用 SMB1 协议登录客户端。中间人攻击者可利用此缺陷修改客户端与服务器之间的流量。(CVE-2016-2114)

* 发现 Samba 默认未针对 IPC 流量启用完整性保护。中间人攻击者可利用此缺陷，查看并修改在 Samba 服务器和客户端之间发送的数据。
(CVE-2016-2115)

Red Hat 在此感谢 Samba 项目报告这些问题。上游感谢 CVE-2015-5370 的原始报告者 Jouni Knuutinen (Synopsis)，以及 CVE-2016-2118、CVE-2016-2110、CVE-2016-2112、CVE-2016-2113、CVE-2016-2114 和 CVE-2016-2115 的原始报告者 Stefan Metzmacher (SerNet)。

此更新修复了以下安全漏洞：

- CVE-2015-5370：DCERPC 服务器和客户端容易遭受 DOS 和 MITM 攻击 (bsc#936862)。

- CVE-2016-2110：中间人可将 NTLMSSP 认证降级 (bsc#973031)。

- CVE-2016-2111：域控制器 netlogon 成员计算机可能遭到欺骗 (bsc#973032)。

- CVE-2016-2112：LDAP 连接容易遭受降级和 MITM 攻击 (bsc#973033)。

- CVE-2016-2113：TLS 证书验证缺失 (bsc#973034)。

- CVE-2016-2114：未强制执行“server signing = mandatory”(bsc#973035)。

- CVE-2016-2115：命名管道 IPC 容易遭受 MITM 攻击 (bsc#973036)。

- CVE-2016-2118：可能会发生经认证帐户的“Badlock”DCERPC 假冒 (bsc#971965)。

由于上游不再支持 4.1.x 版本，因此 openSUSE 13.1 更新也升级到 samba 4.2.4。副作用是 libpdb0 程序包会被 libsamba-passdb0 替换。

The version of Samba on the remote host is 4.3.x prior to 4.3.7 and is affected by the following vulnerabilities :

 - A flaw exists in the DCE-RPC client when handling specially crafted DCE-RPC packets. A man-in-the-middle (MitM) attacker can exploit this to downgrade the connection security, cause a denial of service through resource exhaustion, or potentially execute arbitrary code. (CVE-2015-5370)
 - A flaw exists in the implementation of NTLMSSP authentication. A MitM attacker can exploit this to clear the NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL settings, take over the connections, cause traffic to be sent unencrypted, or have other unspecified impact. (CVE-2016-2110)
 - A flaw exists in NETLOGON due to a failure to properly establish a secure channel connection. A MitM attacker can exploit this to spoof the computer names of a secure channel's endpoints, potentially gaining session information. (CVE-2016-2111)
 - A flaw exists in the integrity protection mechanisms that allows a MitM attacker to downgrade a secure LDAP connection to an insecure version. (CVE-2016-2112)
 - A flaw exists due to improper validation of TLS certificates for the LDAP and HTTP protocols. A MitM attacker can exploit this, via a crafted certificate, to spoof a server, resulting in the disclosure or manipulation of the transmitted traffic. (CVE-2016-2113)
 - A flaw exists due to a failure to enforce the 'server signing = mandatory' option in smb.conf for clients using the SMB1 protocol. A MitM attacker can exploit this to conduct spoofing attacks. (CVE-2016-2114)
 - A flaw exists due to a failure to perform integrity checking for SMB client connections. A MitM attacker can exploit this to conduct spoofing attacks since the protection mechanisms for DCERPC communication sessions are inherited from the underlying SMB connection. (CVE-2016-2115)
  - A flaw, known as Badlock, exists in the Security Account Manager (SAM) and Local Security Authority (Domain Policy) (LSAD) protocols due to improper authentication level negotiation over Remote Procedure Call (RPC) channels. A MitM attacker who is able to able to intercept the traffic between a client and a server hosting a SAM database can exploit this flaw to force a downgrade of the authentication level, which allows the execution of arbitrary Samba network calls in the context of the intercepted user, such as viewing or modifying sensitive security data in the Active Directory (AD) database or disabling critical services. (CVE-2016-2118)

According to its banner, the version of Samba running on the remote host is 4.2.x prior to 4.2.11, 4.3.x prior to 4.3.8, or 4.4.x prior to 4.4.2. Therefore, it is affected by the following vulnerabilities :

 - A flaw exists in the DCE-RPC client that is triggered during the handling of specially crafted DCE-RPC packets. This may allow a remote attacker to conduct a MitM attack, downgrade a secure connection to an insecure one, cause a consumption of CPU resources, or potentially execute arbitrary code. (CVE-2015-5370)
 - A flaw exists in the implementation of NTLMSSP authentication that may allow a MitM attacker to conduct multiple attacks. This may allow the attacker to clear 'NTLMSSP_NEGOTIATE_SIGN' and 'NTLMSSP_NEGOTIATE_SEAL', take over connections, cause traffic to be sent without encryption, or potentially have other impacts. (CVE-2016-2110)
 - A flaw exists in NETLOGON that is due to the program failing to properly establish a secure channel connection. This may allow a remote MitM attacker to spoof a secure channel's endpoints' computer name and potentially obtain session information. (CVE-2016-2111)
 - A flaw exists that is due to a lack of integrity protection mechanisms. This may allow a remote MitM attacker to downgrade a secure LDAP connection to an insecure version of the connection. (CVE-2016-2112)
 - A flaw exists as TLS certificates are not properly validated for the LDAP and HTTP protocols. By spoofing the server via a certificate that appears valid, an attacker with the ability to intercept network traffic (e.g. MitM, DNS cache poisoning) can disclose and optionally manipulate transmitted data. (CVE-2016-2113)
 - A flaw exists that is due to the program failing to enforce the 'server signing = mandatory' option in 'smb.conf' for clients using the SMB1 protocol. This may result in SMB signing not being properly required, potentially allowing a MitM attacker to conduct spoofing attacks. (CVE-2016-2114)
 - A flaw exists that is due to the program failing to perform integrity checks for SMB client connections. As the protection mechanisms for DCERPC communication sessions are inherited from the underlying SMB connection, this may allow a MitM attacker to conduct spoofing attacks. (CVE-2016-2115)

The version of Samba on the remote host is 4.2.x prior to 4.2.10 and is affected by the following vulnerabilities :

 - A flaw exists in the DCE-RPC client when handling specially crafted DCE-RPC packets. A man-in-the-middle (MitM) attacker can exploit this to downgrade the connection security, cause a denial of service through resource exhaustion, or potentially execute arbitrary code. (CVE-2015-5370)
 - A flaw exists in the implementation of NTLMSSP authentication. A MitM attacker can exploit this to clear the NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL settings, take over the connections, cause traffic to be sent unencrypted, or have other unspecified impact. (CVE-2016-2110)
 - A flaw exists in NETLOGON due to a failure to properly establish a secure channel connection. A MitM attacker can exploit this to spoof the computer names of a secure channel's endpoints, potentially gaining session information. (CVE-2016-2111)
 - A flaw exists in the integrity protection mechanisms that allows a MitM attacker to downgrade a secure LDAP connection to an insecure version. (CVE-2016-2112)
 - A flaw exists due to improper validation of TLS certificates for the LDAP and HTTP protocols. A MitM attacker can exploit this, via a crafted certificate, to spoof a server, resulting in the disclosure or manipulation of the transmitted traffic. (CVE-2016-2113)
 - A flaw exists due to a failure to enforce the 'server signing = mandatory' option in smb.conf for clients using the SMB1 protocol. A MitM attacker can exploit this to conduct spoofing attacks. (CVE-2016-2114)
 - A flaw exists due to a failure to perform integrity checking for SMB client connections. A MitM attacker can exploit this to conduct spoofing attacks since the protection mechanisms for DCERPC communication sessions are inherited from the underlying SMB connection. (CVE-2016-2115)
  - A flaw, known as Badlock, exists in the Security Account Manager (SAM) and Local Security Authority (Domain Policy) (LSAD) protocols due to improper authentication level negotiation over Remote Procedure Call (RPC) channels. A MitM attacker who is able to able to intercept the traffic between a client and a server hosting a SAM database can exploit this flaw to force a downgrade of the authentication level, which allows the execution of arbitrary Samba network calls in the context of the intercepted user, such as viewing or modifying sensitive security data in the Active Directory (AD) database or disabling critical services. (CVE-2016-2118)

The version of Samba on the remote host is 4.4.x prior to 4.4.1 and is affected by the following vulnerabilities :

 - A flaw exists in the DCE-RPC client when handling specially crafted DCE-RPC packets. A man-in-the-middle (MitM) attacker can exploit this to downgrade the connection security, cause a denial of service through resource exhaustion, or potentially execute arbitrary code. (CVE-2015-5370)
 - A flaw exists in the implementation of NTLMSSP authentication. A MitM attacker can exploit this to clear the NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL settings, take over the connections, cause traffic to be sent unencrypted, or have other unspecified impact. (CVE-2016-2110)
 - A flaw exists in NETLOGON due to a failure to properly establish a secure channel connection. A MitM attacker can exploit this to spoof the computer names of a secure channel's endpoints, potentially gaining session information. (CVE-2016-2111)
 - A flaw exists in the integrity protection mechanisms that allows a MitM attacker to downgrade a secure LDAP connection to an insecure version. (CVE-2016-2112)
 - A flaw exists due to improper validation of TLS certificates for the LDAP and HTTP protocols. A MitM attacker can exploit this, via a crafted certificate, to spoof a server, resulting in the disclosure or manipulation of the transmitted traffic. (CVE-2016-2113)
 - A flaw exists due to a failure to enforce the 'server signing = mandatory' option in smb.conf for clients using the SMB1 protocol. A MitM attacker can exploit this to conduct spoofing attacks. (CVE-2016-2114)
 - A flaw exists due to a failure to perform integrity checking for SMB client connections. A MitM attacker can exploit this to conduct spoofing attacks since the protection mechanisms for DCERPC communication sessions are inherited from the underlying SMB connection. (CVE-2016-2115)
  - A flaw, known as Badlock, exists in the Security Account Manager (SAM) and Local Security Authority (Domain Policy) (LSAD) protocols due to improper authentication level negotiation over Remote Procedure Call (RPC) channels. A MitM attacker who is able to able to intercept the traffic between a client and a server hosting a SAM database can exploit this flaw to force a downgrade of the authentication level, which allows the execution of arbitrary Samba network calls in the context of the intercepted user, such as viewing or modifying sensitive security data in the Active Directory (AD) database or disabling critical services. (CVE-2016-2118)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
90514	Amazon Linux AMI：samba (ALAS-2016-686) (Badlock)	Nessus	Amazon Linux Local Security Checks	2016/4/14	2019/7/10	high
90515	Debian DSA-3548-1：samba - 安全更新 (Badlock)	Nessus	Debian Local Security Checks	2016/4/14	2021/1/11	high
90530	RHEL 6 / 7：Storage Server (RHSA-2016:0614) (Badlock)	Nessus	Red Hat Local Security Checks	2016/4/15	2019/10/24	high
90609	openSUSE 安全更新：samba (openSUSE-2016-490) (Badlock)	Nessus	SuSE Local Security Checks	2016/4/21	2021/1/19	high
9232	Samba 4.3.x < 4.3.7 Multiple Vulnerabilities (Badlock)	Nessus Network Monitor	Samba	2016/4/12	2019/3/6	high
9822	Samba 4.2.x < 4.2.11 / 4.3.x < 4.3.8 / 4.4.x < 4.4.2 Multiple MitM	Nessus Network Monitor	Samba	2016/12/9	2019/3/6	medium
9231	Samba 4.2.x < 4.2.10 Multiple Vulnerabilities (Badlock)	Nessus Network Monitor	Samba	2016/4/12	2019/3/6	high
9233	Samba 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock)	Nessus Network Monitor	Samba	2016/4/12	2019/3/6	high

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