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CVE-2018-19365: Wowza Streaming Engine: Improper Limitation of a Pathname to a Restricted Directory

CVE-2018-19365 is rated critical with a CVSS v3.1 base score of 9.1 and affects Wowza Streaming Engine. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

The REST API in Wowza Streaming Engine 4.7.4.01 allows traversal of the directory structure and retrieval of a file via a remote, specifically crafted HTTP request.

Severity breakdown

CVSS v3.1 9.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

• Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
• Attack complexity: Low. No special conditions; the attack can be repeated reliably.
• Privileges required: None. No account or prior access is needed.
• User interaction: None. No action from any user is needed.
• Scope: Unchanged. Impact stays within the vulnerable component.
• Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
• Integrity impact: None. No loss of integrity.
• Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-22: Improper Limitation of a Pathname to a Restricted Directory

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.

Affected products

• Wowza Streaming Engine: 4.7.4.0.1

References

• https://blog.gdssecurity.com/labs/2019/2/11/wowza-streaming-engine-manager-directory-traversal-and-local.html
• https://raw.githubusercontent.com/WowzaMediaSystems/public_cve/main/wowza-streaming-engine/CVE-2018-19365.txt