Ahsay Cloud Backup Suite 8.3.0.30 File Upload /obs/obm7/file/upload PUT Request unrestricted upload

Summaryinfo

A vulnerability labeled as critical has been found in Ahsay Cloud Backup Suite 8.3.0.30. Affected by this vulnerability is an unknown functionality of the file /obs/obm7/file/upload of the component File Upload. The manipulation as part of PUT Request results in unrestricted upload. This vulnerability was named CVE-2020-5846. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in Ahsay Cloud Backup Suite 8.3.0.30 (Backup Software). Affected is an unknown part of the file /obs/obm7/file/upload of the component File Upload. 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. CVE summarizes:

An insecure file upload and code execution issue was discovered in Ahsay Cloud Backup Suite 8.3.0.30 via a "PUT /obs/obm7/file/upload" request with the base64-encoded pathname in the X-RSW-custom-encode-path HTTP header, and the content in the HTTP request body. It is possible to upload a file into any directory of the server. One can insert a JSP shell into the web server's directory and execute it. This leads to full system access as the configured user (e.g., Administrator) when starting from any authenticated session (e.g., a trial account). This is fixed in the 83/830122/cbs-*-hotfix-task26000 builds.

The weakness was presented 01/06/2020. This vulnerability is traded as CVE-2020-5846 since 01/06/2020. The exploitability is told to be easy. It is possible to launch the attack remotely. A authentication is necessary for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1608.002.

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

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Productinfo

Type

• Backup Software

Vendor

• Ahsay

Name

• Cloud Backup Suite

Version

• 8.3.0.30

CPE 2.3info

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CPE 2.2info

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