Shekar Endoscope App avilib.dll memmove WiFi Password memory corruption

Summaryinfo

A vulnerability was found in Shekar Endoscope. It has been rated as critical. This vulnerability affects the function memmove in the library avilib.dll of the component App. The manipulation as part of WiFi Password leads to memory corruption. This vulnerability is referenced as CVE-2017-10722. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Shekar Endoscope (version unknown) and classified as critical. This issue affects the function memmove in the library avilib.dll of the component App. The manipulation as part of a WiFi Password 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. The summary by CVE is:

Recently it was discovered as a part of the research on IoT devices in the most recent firmware for Shekar Endoscope that the desktop application used to connect to the device suffers from a stack overflow if more than 26 characters are passed to it as the Wi-Fi password. This application is installed on the device and an attacker who can provide the right payload can execute code on the user's system directly. Any breach of this system can allow an attacker to get access to all the data that the user has access too. The application uses a dynamic link library(DLL) called "avilib.dll" which is used by the application to send binary packets to the device that allow to control the device. One such action that the DLL provides is change password in the function "sendchangepass" which allows a user to change the Wi-Fi password on the device. This function calls a sub function "sub_75876EA0" at address 0x7587857C. The function determines which action to execute based on the parameters sent to it. The "sendchangepass" passes the datastring as the second argument which is the password we enter in the textbox and integer 2 as first argument. The rest of the 3 arguments are set to 0. The function "sub_75876EA0" at address 0x75876F19 uses the first argument received and to determine which block to jump to. Since the argument passed is 2, it jumps to 0x7587718C and proceeds from there to address 0x758771C2 which calculates the length of the data string passed as the first parameter.This length and the first argument are then passed to the address 0x7587726F which calls a memmove function which uses a stack address as the destination where the password typed by us is passed as the source and length calculated above is passed as the number of bytes to copy which leads to a stack overflow.

The weakness was published 06/17/2019 as not defined mailinglist post (Bugtraq). It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2017-10722 since 07/01/2017. Attacking locally is a requirement. No form of authentication is needed for a successful 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.

Similar entries are available at VDB-136204, VDB-136205, VDB-136206 and VDB-136207. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Shekar

Name

• Endoscope

CPE 2.3info

• 🔍

CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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