ProBot up to 2021-02-08 on Discord Send Image unrestricted upload ⚔ [Disputed]

Summaryinfo

A vulnerability was found in ProBot up to 2021-02-08 on Discord. It has been rated as critical. Impacted is an unknown function of the component Send Image Handler. Performing a manipulation results in unrestricted upload. This vulnerability is cataloged as CVE-2021-26918. There is no exploit available. It is still unclear if this vulnerability genuinely exists.

Detailsinfo

A vulnerability was found in ProBot up to 2021-02-08 on Discord. It has been classified as critical. This affects an unknown function of the component Send Image Handler. The manipulation with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The ProBot bot through 2021-02-08 for Discord might allow attackers to interfere with the intended purpose of the "Send an image when a user joins the server" feature (or possibly have unspecified other impact) because the uploader web service allows double extensions (such as .html.jpg) with the text/html content type. NOTE: there may not be cases in which an uploader web service is customer controlled; however, the nature of the issue has substantial interaction with customer controlled configuration. NOTE: the vendor states "This is just an uploader (like any other one) which uploads files to cloud storage and accepts various file types. There is no kind of vulnerability and it won't compromise either the client side or the server side.

The weakness was shared 02/09/2021. The advisory is shared at raw.githubusercontent.com. This vulnerability is uniquely identified as CVE-2021-26918. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

The real existence of this vulnerability is still doubted at the moment.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• ProBot

Version

• 2021-02-08

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion