Tenda AC7/AC9/AC10/AC15/AC18 Web Server ssid memory corruption

Summaryinfo

A vulnerability classified as problematic has been found in Tenda AC7, AC9, AC10, AC15 and AC18. Affected by this vulnerability is an unknown functionality of the component Web Server. Performing a manipulation of the argument ssid as part of POST Request results in memory corruption. This vulnerability is reported as CVE-2018-18707. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in Tenda AC7, AC9, AC10, AC15 and AC18. This affects some unknown processing of the component Web Server. The manipulation of the argument ssid as part of a POST Request leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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 "ssid" parameter for a post request, the value is directly used in a strcpy 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 disclosed 10/28/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2018-18707 since 10/27/2018. The exploitability is told to be easy. 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.

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.

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Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• AC7
• AC9
• AC10
• AC15
• AC18

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

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