A vulnerability has been identified in XHQ (All versions < V6.0.0.2). The web interface could allow for an an attacker to craft the input in a form that is not expected, causing the application to behave in unexpected ways for legitimate users. Successful exploitation requires for an attacker to be authenticated to the web interface. A successful attack could cause the application to have unexpected behavior. This could allow the attacker to modify contents of the web application. At the time of advisory publication no public exploitation of this security vulnerability was known.
Weakness
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as “<”, “>”, and “&” that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.
Affected Software
| Name |
Vendor |
Start Version |
End Version |
| Xhq |
Siemens |
* |
6.0.0.2 (excluding) |
Potential Mitigations
- Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
- The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.
References