A vulnerability was found in Horde Groupware Webmail Edition 5.2.17/5.2.22 (Groupware Software). It has been declared as critical. This vulnerability affects the function onSubmit of the file Horde/Form/Type.php of the component Image Upload. The manipulation of the argument upload[img][file] as part of a POST Parameter leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Remote code execution was discovered in Horde Groupware Webmail 5.2.22 and 5.2.17. Horde/Form/Type.php contains a vulnerable class that handles image upload in forms. When the Horde_Form_Type_image method onSubmit() is called on uploads, it invokes the functions getImage() and _getUpload(), which uses unsanitized user input as a path to save the image. The unsanitized POST parameter object[photo][img][file] is saved in the $upload[img][file] PHP variable, allowing an attacker to manipulate the $tmp_file passed to move_uploaded_file() to save the uploaded file. By setting the parameter to (for example) ../usr/share/horde/static/bd.php, one can write a PHP backdoor inside the web root. The static/ destination folder is a good candidate to drop the backdoor because it is always writable in Horde installations. (The unsanitized POST parameter went probably unnoticed because it's never submitted by the forms, which default to securely using a random path.)

The bug was discovered 04/10/2019. The weakness was presented 05/29/2019 (Website). The advisory is available at seclists.org. This vulnerability was named CVE-2019-9858 since 03/18/2019. The exploitation appears to be easy. The attack can be initiated remotely. A single authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 49 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:Horde/Form/Type.php it is possible to find vulnerable targets with Google Hacking. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176991 (Debian Security Update for php-horde-form (DLA 1822-1)).

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

See VDB-103505, VDB-124539, VDB-125360 and VDB-141872 for similar entries.

Productinfo

Type

• Groupware Software

Vendor

• Horde

Name

• Groupware Webmail Edition

Version

• 5.2.17
• 5.2.22

License

• free

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CPE 2.2info

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