A vulnerability, which was classified as critical, has been found in Yeahlink Ultra-elegant IP Phone SIP-T41P 66.83.0.35 (IP Phone Software). This issue affects an unknown part of the component Diagnostics Web Interface. The manipulation of the argument file as part of a POST 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, integrity, and availability. The summary by CVE is:

The diagnostics web interface in the Yeahlink Ultra-elegant IP Phone SIP-T41P (firmware 66.83.0.35) does not validate (escape) the path information (path traversal), which allows an authenticated remote attacker to get access to privileged information (e.g., /etc/passwd) via path traversal (relative path information in the file parameter of the corresponding POST request).

The weakness was disclosed 05/29/2019. The identification of this vulnerability is CVE-2018-16221 since 08/30/2018. The attack may be initiated remotely. A simple authentication is necessary for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

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

The entries 135676 and 135675 are pretty similar.

Productinfo

Type

• IP Phone Software

Vendor

• Yeahlink

Name

• Ultra-elegant IP Phone SIP-T41P

Version

• 66.83.0.35

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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CVSSv2info

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Threat Intelligenceinfo

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