A vulnerability was found in Wowza Streaming Engine up to 4.7.0. It has been rated as critical. Affected by this issue is an unknown code block of the component com.wowza.wms.timedtext.http.HTTPProviderCaptionFile. The manipulation as part of a HTTP Request leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, and integrity. CVE summarizes:

In com.wowza.wms.timedtext.http.HTTPProviderCaptionFile in Wowza Streaming Engine before 4.7.1, traversal of the directory structure and retrieval of a file are possible via a remote, specifically crafted HTTP request.

The bug was discovered 03/02/2018. The weakness was released 03/05/2018 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is handled as CVE-2017-16922 since 11/21/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 4.7.1 eliminates this vulnerability.

Productinfo

Vendor

• Wowza

Name

• Streaming Engine

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7

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CPE 2.2info

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