Tenda AC6/AC9/AC15/AC118 V15.03.05 httpd /goform/SetSpeedWan speed_dir buffer overflow

Summaryinfo

A vulnerability was found in Tenda AC6, AC9, AC15 and AC118 V15.03.05. It has been classified as critical. This affects an unknown function of the file /goform/SetSpeedWan of the component httpd. Performing a manipulation of the argument speed_dir as part of POST Request results in buffer overflow. This vulnerability is cataloged as CVE-2020-13391. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Tenda AC6, AC9, AC15 and AC118 V15.03.05. This affects an unknown code block of the file /goform/SetSpeedWan of the component httpd. The manipulation of the argument speed_dir as part of a POST Request leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/SetSpeedWan speed_dir parameter for a POST request, a value is directly used in a sprintf to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

The weakness was shared 05/22/2020. This vulnerability is uniquely identified as CVE-2020-13391 since 05/22/2020. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-155562, VDB-155561, VDB-155560 and VDB-155558 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• AC6
• AC9
• AC15
• AC118

Version

• V15.03.05

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

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