Yealink Phone up to 2019-08-04 OpenVPN File Upload path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in Yealink Phone up to 2019-08-04. This affects an unknown function of the component OpenVPN File Upload Handler. Performing a manipulation with the input ./../../../ results in path traversal. This vulnerability is identified as CVE-2019-14657. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Yealink Phone up to 2019-08-04. It has been classified as critical. This affects an unknown functionality of the component OpenVPN File Upload Handler. The manipulation with the input value ./../../../ leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Yealink phones through 2019-08-04 have an issue with OpenVPN file upload. They execute tar as root to extract files, but do not validate the extraction directory. Creating a tar file with ../../../../ allows replacement of almost any file on a phone. This leads to password replacement and arbitrary code execution as root.

The weakness was released 10/08/2019. This vulnerability is uniquely identified as CVE-2019-14657 since 08/04/2019. The exploitability is told to be easy. It is possible to initiate the attack remotely. The successful exploitation needs a authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

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

Entry connected to this vulnerability is available at VDB-143150. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Yealink

Name

• Phone

Version

• 2019-08-04

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion