Securifi Almond/Almond+/Almond 2015 AL-R096 Port Forwarding POST Parameter command injection

Summaryinfo

A vulnerability, which was classified as critical, was found in Securifi Almond, Almond+ and Almond 2015 AL-R096. This affects an unknown function of the component Port Forwarding. Such manipulation as part of POST Parameter leads to command injection. This vulnerability is listed as CVE-2017-8331. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Securifi Almond, Almond+ and Almond 2015 AL-R096. It has been rated as critical. Affected by this issue is some unknown functionality of the component Port Forwarding. The manipulation as part of a POST Parameter leads to a command injection vulnerability. Using CWE to declare the problem leads to CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. Impacted is 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 adding new port forwarding rules to the device. It seems that the POST parameters passed in this request to set up routes on the device can be set in such a way that would result in passing commands to a "system" API in the function and thus result in command injection on the device. 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_43C280in IDA pro is identified to be receiving the values sent in the POST request and the value set in POST parameter "ip_address" is extracted at address 0x0043C2F0. The POST parameter "ipaddress" is concatenated at address 0x0043C958 and this is passed to a "system" function at address 0x00437284. This allows an attacker to provide the payload of his/her choice and finally take control of the device.

The weakness was presented 06/18/2019 as not defined mailinglist post (Bugtraq). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2017-8331 since 04/29/2017. The exploitation is known to be easy. The attack may be launched remotely. A simple authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1202.

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

See VDB-136204, VDB-136205, VDB-136206 and VDB-136207 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Securifi

Name

• Almond
• Almond+
• Almond 2015

Version

• AL-R096

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Once again VulDB remains the best source for vulnerability data.

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