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Zenitel AlphaCom XE Audio Server 11.2.3.10 Shell Upload

Zenitel AlphaCom XE Audio Server 11.2.3.10 Shell Upload
Posted Sep 14, 2021
Authored by Ricardo Jose Ruiz Fernandez

Zenitel AlphaCom XE Audio Server versions up to 11.2.3.10 have a web interface called AlphaWeb XE that allows for a remote shell upload.

tags | exploit, remote, web, shell
advisories | CVE-2021-40845
SHA-256 | db3e0721685ee34c318d514cffb76f972c85d297a6080f1d2a9693cb1d01d628

Zenitel AlphaCom XE Audio Server 11.2.3.10 Shell Upload

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I. VULNERABILITY
-------------------------
AlphaWeb XE - Authenticated Insecure File Upload leading to RCE


II. CVE REFERENCE
-------------------------
CVE-2021-40845


III. VENDOR
-------------------------
https://www.zenitel.com/


IV. DESCRIPTION
-------------------------

The web part of Zenitel AlphaCom XE Audio Server through 11.2.3.10, called AlphaWeb XE, does not restrict file upload in the Custom Scripts section at php/index.php. Neither the content nor extension of the uploaded files is checked, allowing execution of PHP code under the /cmd directory.

To exploit this vulnerability, someone must authenticate in the server and access the "Scripts" button in the "Custom scripts" tab.

![img1](https://github.com/ricardojoserf/ricardojoserf.github.io/blob/master/images/alphaweb-rce/image1.png?raw=true)

Then, the button "Choose file" is clicked and the file is uploaded clicking "Upload".

![img3](https://github.com/ricardojoserf/ricardojoserf.github.io/blob/master/images/alphaweb-rce/image3.png?raw=true)

The PHP test file is a simple one-line reverse shell:

![img2](https://github.com/ricardojoserf/ricardojoserf.github.io/blob/master/images/alphaweb-rce/image2.png?raw=true)

The new file, with the same name, extension and content is listed in the Scripts page:

![img4](https://github.com/ricardojoserf/ricardojoserf.github.io/blob/master/images/alphaweb-rce/image4.png?raw=true)

The path of these files is /cmd/$FILE$. Knowing the path, as there is not any restriction the file upload functionality, uploading a PHP reverse shell or cmdshell allows to get Remote Code Execution in the server:

![img5](https://github.com/ricardojoserf/ricardojoserf.github.io/blob/master/images/alphaweb-rce/image5.png?raw=true)


V. REFERENCES
-------------------------
https://wiki.zenitel.com/wiki/AlphaWeb
https://wiki.zenitel.com/wiki/AlphaWeb_Custom_Scripts
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40845


VI. CREDIT
-------------------------
Ricardo José Ruiz Fernández (@ricardojoserf)
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