ukcms up to 1.1.7 upload.html Request unrestricted upload

Summaryinfo

A vulnerability, which was classified as critical, was found in ukcms up to 1.1.7. Impacted is an unknown function of the file admin.php/admin/configset/index/group/upload.html. Such manipulation as part of Request leads to unrestricted upload. This vulnerability is referenced as CVE-2018-14911. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ukcms up to 1.1.7. Affected by this issue is some unknown functionality of the file admin.php/admin/configset/index/group/upload.html. The manipulation as part of a Request leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A file upload vulnerability exists in ukcms v1.1.7 and earlier. The vulnerability is due to the system not strictly filtering the file upload type. An attacker can exploit the vulnerability to upload a script Trojan to admin.php/admin/configset/index/group/upload.html to gain server control by composing a request for a .txt upload and then changing it to a .php upload. The attacker must have admin access to change the upload_file_ext (aka "Allow upload file suffix") setting, and must use "php,php" in this setting to bypass the "php" restriction.

The bug was discovered 08/01/2018. The weakness was published 08/03/2018 (Website). The advisory is shared for download at github.com. This vulnerability is handled as CVE-2018-14911 since 08/03/2018. The exploitation is known to be easy. The attack may be launched remotely. A simple authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1608.002.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:admin.php/admin/configset/index/group/upload.html it is possible to find vulnerable targets with Google Hacking.

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

Name

• ukcms

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7

CPE 2.3info

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CPE 2.2info

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