Guillermo Kardolus created KNOX-3039:
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Summary: Vulnerability Disclosure: IP Address Exposure in HTTP 500
Error Message
Key: KNOX-3039
URL: https://issues.apache.org/jira/browse/KNOX-3039
Project: Apache Knox
Issue Type: Bug
Components: Server
Reporter: Guillermo Kardolus
A potential security vulnerability has been identified in Apache Knox where
internal IP addresses are exposed in HTTP 500 error messages. This issue can
occur when a user modifies the URL for one of the proxy services, leading to an
error page that includes the IP address of the internal service.
*Steps to Reproduce:*
# Navigate to a proxy service URL, for example:
{{<https://example.com:8443/gateway/proxy/service?scheme=https&host=example.com&port=8051>}}
# Modify the {{port}} parameter to an invalid port, such as:
{{<https://example.com:8443/gateway/proxy/service?scheme=https&host=example.com&port=9999>}}
# Observe the resulting HTTP 500 error message which includes the internal IP
address.
*Observed Behavior:* The error message reveals the internal IP address in the
stack trace, which can be used by an attacker for port scanning and other
malicious activities.
*Example:*
{code:java}
HTTP ERROR 500 java.io.IOException: java.io.IOException: Service connectivity
error.
MESSAGE: java.io.IOException: java.io.IOException: Service connectivity error.
...
CAUSED BY: java.io.IOException: Connect to example.com:9996
[example.com/10.140.190.10] failed: Connection refused (Connection refused)
... {code}
*Expected Behavior:* Error messages should not expose internal IP addresses.
Instead, they should be sanitized to prevent the disclosure of sensitive
information.
*Proposed Solution:*
# *Sanitization Mechanism:* Implement a mechanism to sanitize error messages
before they are sent to the client. This can include replacing IP addresses
with placeholders such as {{{}[hidden]{}}}.
# *Configuration Options:* Provide configuration options for users to enable
or disable this sanitization based on their security needs. By default, users
should opt-in to this new sanitization functionality, with an option to opt-out
if necessary.
# *Knox-specific Error Page:* Additionally, it has been proposed to create a
Knox-specific error page that can be displayed in case of such errors. This
error page can provide a generic error message without revealing any sensitive
information, further enhancing security.
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