Tenda AC7/AC9/AC10/AC15/AC18 Web Server fromDhcpListClient page memory corruption

Summaryinfo

A vulnerability described as problematic has been identified in Tenda AC7, AC9, AC10, AC15 and AC18. Affected is the function fromDhcpListClient of the component Web Server. Such manipulation of the argument page as part of Parameter leads to memory corruption. This vulnerability is documented as CVE-2018-18706. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability was found in Tenda AC7, AC9, AC10, AC15 and AC18. It has been rated as problematic. Affected by this issue is the function fromDhcpListClient of the component Web Server. The manipulation of the argument page as part of a Parameter leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered on Tenda AC7 V15.03.06.44_CN, AC9 V15.03.05.19(6318)_CN, AC10 V15.03.06.23_CN, AC15 V15.03.05.19_CN, and AC18 V15.03.05.19(6318)_CN devices. It is a buffer overflow vulnerability in the router's web server -- httpd. When processing the "page" parameter of the function "fromDhcpListClient" for a request, it is directly used in a sprintf to a local variable placed on the stack, which overrides the return address of the function.

The bug was discovered 10/25/2018. The weakness was released 10/28/2018 (Website). The advisory is available at github.com. This vulnerability is handled as CVE-2018-18706 since 10/27/2018. The exploitation is known to be easy. Local access is required to approach this attack. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k.

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

Entries connected to this vulnerability are available at VDB-126029, VDB-126028 and VDB-126027. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• AC7
• AC9
• AC10
• AC15
• AC18

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

CPE 2.3info

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CPE 2.2info

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Submitinfo

Duplicate

• Submit #XXXXXX: Xxxxx Xxxx Xxx.xx.xx.xx Xxxxxx Xxxxxxxx (by yhryhryhr_tutu)

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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