A vulnerability classified as critical was found in BrightSign Digital Signage up to 6.2.63. This vulnerability affects an unknown function of the file /storage.html. The manipulation of the argument rp with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The BrightSign Digital Signage (4k242) device (Firmware 6.2.63 and below) has directory traversal via the /storage.html rp parameter, allowing an attacker to read or write to files.

The bug was discovered 12/15/2017. The weakness was disclosed 12/18/2017 (Website). The advisory is available at information-paradox.net. This vulnerability was named CVE-2017-17739 since 12/18/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. 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. By approaching the search of inurl:storage.html it is possible to find vulnerable targets with Google Hacking.

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

The vulnerability is also documented in the vulnerability database at Exploit-DB (43364).

Productinfo

Vendor

• BrightSign

Name

• Digital Signage

Version

• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8
• 6.2.9
• 6.2.10
• 6.2.11
• 6.2.12
• 6.2.13
• 6.2.14
• 6.2.15
• 6.2.16
• 6.2.17
• 6.2.18
• 6.2.19
• 6.2.20
• 6.2.21
• 6.2.22
• 6.2.23
• 6.2.24
• 6.2.25
• 6.2.26
• 6.2.27
• 6.2.28
• 6.2.29
• 6.2.30
• 6.2.31
• 6.2.32
• 6.2.33
• 6.2.34
• 6.2.35
• 6.2.36
• 6.2.37
• 6.2.38
• 6.2.39
• 6.2.40
• 6.2.41
• 6.2.42
• 6.2.43
• 6.2.44
• 6.2.45
• 6.2.46
• 6.2.47
• 6.2.48
• 6.2.49
• 6.2.50
• 6.2.51
• 6.2.52
• 6.2.53
• 6.2.54
• 6.2.55
• 6.2.56
• 6.2.57
• 6.2.58
• 6.2.59
• 6.2.60
• 6.2.61
• 6.2.62
• 6.2.63

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