D-Link DCS-1130 libmailutils.so sub_1FC4 POST Parameter command injection

Summaryinfo

A vulnerability classified as critical was found in D-Link DCS-1130. This affects the function sub_1FC4 of the file libmailutils.so. The manipulation as part of POST Parameter results in command injection. This vulnerability is reported as CVE-2017-8404. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in D-Link DCS-1130 (version unknown). Affected is the function sub_1FC4 of the file libmailutils.so. The manipulation as part of a POST Parameter leads to a command injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered on D-Link DCS-1130 devices. The device provides a user with the capability of setting a SMB folder for the video clippings recorded by the device. It seems that the POST parameters passed in this request (to test if email credentials and hostname sent to the device work properly) result in being passed as commands to a "system" API in the function and thus result in command injection on the device. If the firmware version is dissected using binwalk tool, we obtain a cramfs-root archive which contains the filesystem set up on the device that contains all the binaries. The library "libmailutils.so" is the one that has the vulnerable function "sub_1FC4" that receives the values sent by the POST request. If we open this binary in IDA-pro we will notice that this follows an ARM little endian format. The function sub_1FC4 in IDA pro is identified to be receiving the values sent in the POST request and the value set in POST parameter "receiver1" is extracted in function "sub_15AC" which is then passed to the vulnerable system API call. The vulnerable library function is accessed in "cgibox" binary at address 0x0008F598 which calls the "mailLoginTest" function in "libmailutils.so" binary as shown below which results in the vulnerable POST parameter being passed to the library which results in the command injection issue.

The weakness was disclosed 07/02/2019 as not defined mailinglist post (Bugtraq). The advisory is shared for download at seclists.org. This vulnerability is traded as CVE-2017-8404 since 05/02/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 10/15/2023). 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.

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

Productinfo

Vendor

• D-Link

Name

• DCS-1130

License

• commercial

Website

• Vendor: https://www.dlink.com/

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Once again VulDB remains the best source for vulnerability data.

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