A vulnerability has been identified in Climatix POL908 (BACnet/IP module) (All versions), Climatix POL909 (AWM module) (All versions < V11.32). A persistent cross-site scripting (XSS) vulnerability exists in the web server access log page of the affected devices that could allow an attacker to inject arbitrary JavaScript code via specially crafted GET requests. The code could be potentially executed later by another (privileged) user. The security vulnerability could be exploited by an attacker with network access to the affected system. Successful exploitation requires no system privileges. An attacker could use the vulnerability to compromise the confidentiality and integrity of other users web sessions.
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 |
| Climatix_pol908_firmware |
Siemens |
* |
* |
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