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

Summaryinfo

A vulnerability was found in Securifi Almond, Almond+ and Almond 2015 AL-R096. It has been declared as critical. Affected by this issue is some unknown functionality. The manipulation of the argument mssid_1 as part of POST Parameter results in memory corruption. This vulnerability is reported as CVE-2017-8335. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in Securifi Almond, Almond+ and Almond 2015 AL-R096. Affected is some unknown processing. 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 name for 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 named "getCfgToHTML" at address 0x004268A8 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 recieves 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 "getCfgToHTML" at address 0x00426924 and this results in overflowing the buffer due to "strcat" function that is utilized by this function.

The weakness was disclosed 06/18/2019 as not defined mailinglist post (Bugtraq). The advisory is shared for download at seclists.org. This vulnerability is traded as CVE-2017-8335 since 04/29/2017. It is possible to launch the attack remotely. Required for exploitation is a authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

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

The entries VDB-136204, VDB-136205, VDB-136206 and VDB-136207 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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