Caucho Resin Jndi Appconfig Tutorial Servlet inputFile path traversal

Summaryinfo

A vulnerability labeled as problematic has been found in Caucho Resin. The affected element is an unknown function of the component Jndi Appconfig Tutorial Servlet. Such manipulation of the argument inputFile leads to path traversal. This vulnerability is uniquely identified as CVE-2017-20284. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Caucho Resin (the affected version unknown) and classified as problematic. Affected by this issue is an unknown part of the component Jndi Appconfig Tutorial Servlet. The manipulation of the argument inputFile with an unknown input 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. CVE summarizes:

Caucho Resin contains a path traversal vulnerability in the documentation webapp (resin-doc) that allows remote unauthenticated attackers to read arbitrary files by supplying a relative path through the inputFile request parameter of the jndi-appconfig tutorial servlet. Attackers can craft requests with directory traversal sequences to the servlet endpoint to read files outside the intended tutorial directory on the underlying system. Exploitation evidence was first observed by the Shadowserver Foundation on 2021-12-10.

The advisory is shared for download at raw.githubusercontent.com. This vulnerability is handled as CVE-2017-20284 since 09/18/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/18/2026). The MITRE ATT&CK project declares the attack technique as T1006.

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

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Productinfo

Vendor

• Caucho

Name

• Resin

CPE 2.3info

• 🔒

CPE 2.2info

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