A vulnerability classified as critical has been found in CeLa Link CLR-M20 (unknown version). This affects an unknown code block of the component WebDAV. The manipulation as part of a PUT Request 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:

CeLa Link CLR-M20 devices allow unauthorized users to upload any file (e.g., asp, aspx, cfm, html, jhtml, jsp, or shtml), which causes remote code execution as well. Because of the WebDAV feature, it is possible to upload arbitrary files by utilizing the PUT method.

The bug was discovered 12/28/2018. The weakness was published 08/08/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2018-15137 since 08/07/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

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

The vulnerability is also documented in the vulnerability database at Exploit-DB (45021).

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• CeLa Link

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• CLR-M20

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