Securifi Almond/Almond+/Almond 2015 AL-R096 mssid_1 memory corruption

Summaryinfo

A vulnerability classified as critical was found in Securifi Almond, Almond+ and Almond 2015 AL-R096. The affected element is an unknown function. The manipulation of the argument mssid_1 as part of POST Parameter results in memory corruption. This vulnerability is identified as CVE-2017-8329. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Securifi Almond, Almond+ and Almond 2015 AL-R096. It has been classified as critical. Affected is an unknown function. The manipulation of the argument mssid_1 as part of a POST Parameter 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. CVE summarizes:

An issue was discovered on Securifi Almond, Almond+, and Almond 2015 devices with firmware AL-R096. The device provides a user with the capability of setting a name for the wireless network. These values are stored by the device in NVRAM (Non-volatile RAM). It seems that the POST parameters passed in this request to set up names on the device do not have a string length check on them. This allows an attacker to send a large payload in the "mssid_1" POST parameter. The device also allows a user to view the name of the Wifi Network set by the user. While processing this request, the device calls a function at address 0x00412CE4 (routerSummary) in the binary "webServer" located in Almond folder, which retrieves the value set earlier by "mssid_1" parameter as SSID2 and this value then results in overflowing the stack set up for this function and allows an attacker to control $ra register value on the stack which allows an attacker to control the device by executing a payload of an attacker's choice. If the firmware version AL-R096 is dissected using binwalk tool, we obtain a cpio-root archive which contains the filesystem set up on the device that contains all the binaries. The binary "goahead" is the one that has the vulnerable function that receives the values sent by the POST request. If we open this binary in IDA-pro we will notice that this follows a MIPS little endian format. The function sub_00420F38 in IDA pro is identified to be receiving the values sent in the POST parameter "mssid_1" at address 0x0042BA00 and then sets in the NVRAM at address 0x0042C314. The value is later retrieved in the function at address 0x00412EAC and this results in overflowing the buffer as the function copies the value directly on the stack.

The weakness was released 06/18/2019 as not defined mailinglist post (Bugtraq). The advisory is available at seclists.org. This vulnerability is traded as CVE-2017-8329 since 04/29/2017. It is possible to launch the attack remotely. The successful exploitation requires a authentication. Successful exploitation requires user interaction by the victim. Technical details 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.

Entries connected to this vulnerability are available at VDB-136204, VDB-136205, VDB-136206 and VDB-136207. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Securifi

Name

• Almond
• Almond+
• Almond 2015

Version

• AL-R096

CPE 2.3info

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CPE 2.2info

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Entryinfo

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

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