Appear TV XC5000/XC5100 3.26.217 Web Server HTTP GET Request path traversal

Summaryinfo

A vulnerability marked as critical has been reported in Appear TV XC5000 and XC5100 3.26.217. The affected element is an unknown function of the component Web Server. The manipulation with the input /../../../../../../../../../../../../etc/passwd as part of HTTP GET Request leads to path traversal. This vulnerability is traded as CVE-2018-7539. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to apply restrictive firewalling.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Appear TV XC5000 and XC5100 3.26.217. This issue affects an unknown code of the component Web Server. The manipulation with the input value /../../../../../../../../../../../../etc/passwd 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. The summary by CVE is:

On Appear TV XC5000 and XC5100 devices with firmware 3.26.217, it is possible to read OS files with a specially crafted HTTP request (such as GET /../../../../../../../../../../../../etc/passwd) to the web server (fuzzd/0.1.1) running the Maintenance Center on port TCP/8088. This can lead to full compromise of the device.

The bug was discovered 04/11/2018. The weakness was shared 04/17/2018 as not defined mailinglist post (Full-Disclosure). The advisory is shared at seclists.org. The identification of this vulnerability is CVE-2018-7539 since 02/27/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k.

Addressing this vulnerability is possible by firewalling tcp/8088.

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Productinfo

Vendor

• Appear TV

Name

• XC5000
• XC5100

Version

• 3.26.217

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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