When doing a TFTP transfer and curl/libcurl is given a URL that contains a very long file name (longer than about 515 bytes), the file name is truncated to fit within the buffer boundaries, but the buffer size is still wrongly updated to use the untruncated length. This too large value is then used in the sendto() call, making curl attempt to send more data than what is actually put into the buffer. The endto() function will then read beyond the end of the heap based buffer. A malicious HTTP(S) server could redirect a vulnerable libcurl-using client to a crafted TFTP URL (if the client hasnt restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curls redirect protocols with –proto-redir and libcurls with CURLOPT_REDIR_PROTOCOLS.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libcurl | Haxx | 7.15.0 (including) | 7.15.0 (including) |
| Libcurl | Haxx | 7.15.1 (including) | 7.15.1 (including) |
| Libcurl | Haxx | 7.15.2 (including) | 7.15.2 (including) |
| Libcurl | Haxx | 7.15.3 (including) | 7.15.3 (including) |
| Libcurl | Haxx | 7.15.4 (including) | 7.15.4 (including) |
| Libcurl | Haxx | 7.15.5 (including) | 7.15.5 (including) |
| Libcurl | Haxx | 7.16.0 (including) | 7.16.0 (including) |
| Libcurl | Haxx | 7.16.1 (including) | 7.16.1 (including) |
| Libcurl | Haxx | 7.16.2 (including) | 7.16.2 (including) |
| Libcurl | Haxx | 7.16.3 (including) | 7.16.3 (including) |
| Libcurl | Haxx | 7.16.4 (including) | 7.16.4 (including) |
| Libcurl | Haxx | 7.17.0 (including) | 7.17.0 (including) |
| Libcurl | Haxx | 7.17.1 (including) | 7.17.1 (including) |
| Libcurl | Haxx | 7.18.0 (including) | 7.18.0 (including) |
| Libcurl | Haxx | 7.18.1 (including) | 7.18.1 (including) |
| Libcurl | Haxx | 7.18.2 (including) | 7.18.2 (including) |
| Libcurl | Haxx | 7.19.0 (including) | 7.19.0 (including) |
| Libcurl | Haxx | 7.19.1 (including) | 7.19.1 (including) |
| Libcurl | Haxx | 7.19.2 (including) | 7.19.2 (including) |
| Libcurl | Haxx | 7.19.3 (including) | 7.19.3 (including) |
| Libcurl | Haxx | 7.19.4 (including) | 7.19.4 (including) |
| Libcurl | Haxx | 7.19.5 (including) | 7.19.5 (including) |
| Libcurl | Haxx | 7.19.6 (including) | 7.19.6 (including) |
| Libcurl | Haxx | 7.19.7 (including) | 7.19.7 (including) |
| Libcurl | Haxx | 7.20.0 (including) | 7.20.0 (including) |
| Libcurl | Haxx | 7.20.1 (including) | 7.20.1 (including) |
| Libcurl | Haxx | 7.21.0 (including) | 7.21.0 (including) |
| Libcurl | Haxx | 7.21.1 (including) | 7.21.1 (including) |
| Libcurl | Haxx | 7.21.2 (including) | 7.21.2 (including) |
| Libcurl | Haxx | 7.21.3 (including) | 7.21.3 (including) |
| Libcurl | Haxx | 7.21.4 (including) | 7.21.4 (including) |
| Libcurl | Haxx | 7.21.5 (including) | 7.21.5 (including) |
| Libcurl | Haxx | 7.21.6 (including) | 7.21.6 (including) |
| Libcurl | Haxx | 7.21.7 (including) | 7.21.7 (including) |
| Libcurl | Haxx | 7.22.0 (including) | 7.22.0 (including) |
| Libcurl | Haxx | 7.23.0 (including) | 7.23.0 (including) |
| Libcurl | Haxx | 7.23.1 (including) | 7.23.1 (including) |
| Libcurl | Haxx | 7.24.0 (including) | 7.24.0 (including) |
| Libcurl | Haxx | 7.25.0 (including) | 7.25.0 (including) |
| Libcurl | Haxx | 7.26.0 (including) | 7.26.0 (including) |
| Libcurl | Haxx | 7.27.0 (including) | 7.27.0 (including) |
| Libcurl | Haxx | 7.28.0 (including) | 7.28.0 (including) |
| Libcurl | Haxx | 7.28.1 (including) | 7.28.1 (including) |
| Libcurl | Haxx | 7.29.0 (including) | 7.29.0 (including) |
| Libcurl | Haxx | 7.30.0 (including) | 7.30.0 (including) |
| Libcurl | Haxx | 7.31.0 (including) | 7.31.0 (including) |
| Libcurl | Haxx | 7.32.0 (including) | 7.32.0 (including) |
| Libcurl | Haxx | 7.33.0 (including) | 7.33.0 (including) |
| Libcurl | Haxx | 7.34.0 (including) | 7.34.0 (including) |
| Libcurl | Haxx | 7.35.0 (including) | 7.35.0 (including) |
| Libcurl | Haxx | 7.36.0 (including) | 7.36.0 (including) |
| Libcurl | Haxx | 7.37.0 (including) | 7.37.0 (including) |
| Libcurl | Haxx | 7.37.1 (including) | 7.37.1 (including) |
| Libcurl | Haxx | 7.38.0 (including) | 7.38.0 (including) |
| Libcurl | Haxx | 7.39 (including) | 7.39 (including) |
| Libcurl | Haxx | 7.40.0 (including) | 7.40.0 (including) |
| Libcurl | Haxx | 7.41.0 (including) | 7.41.0 (including) |
| Libcurl | Haxx | 7.42.0 (including) | 7.42.0 (including) |
| Libcurl | Haxx | 7.42.1 (including) | 7.42.1 (including) |
| Libcurl | Haxx | 7.43.0 (including) | 7.43.0 (including) |
| Libcurl | Haxx | 7.44.0 (including) | 7.44.0 (including) |
| Libcurl | Haxx | 7.45.0 (including) | 7.45.0 (including) |
| Libcurl | Haxx | 7.46.0 (including) | 7.46.0 (including) |
| Libcurl | Haxx | 7.47.0 (including) | 7.47.0 (including) |
| Libcurl | Haxx | 7.47.1 (including) | 7.47.1 (including) |
| Libcurl | Haxx | 7.48.0 (including) | 7.48.0 (including) |
| Libcurl | Haxx | 7.49.0 (including) | 7.49.0 (including) |
| Libcurl | Haxx | 7.49.1 (including) | 7.49.1 (including) |
| Libcurl | Haxx | 7.50.0 (including) | 7.50.0 (including) |
| Libcurl | Haxx | 7.50.1 (including) | 7.50.1 (including) |
| Libcurl | Haxx | 7.50.2 (including) | 7.50.2 (including) |
| Libcurl | Haxx | 7.50.3 (including) | 7.50.3 (including) |
| Libcurl | Haxx | 7.51.0 (including) | 7.51.0 (including) |
| Libcurl | Haxx | 7.52.0 (including) | 7.52.0 (including) |
| Libcurl | Haxx | 7.52.1 (including) | 7.52.1 (including) |
| Libcurl | Haxx | 7.53.0 (including) | 7.53.0 (including) |
| Libcurl | Haxx | 7.53.1 (including) | 7.53.1 (including) |
| Libcurl | Haxx | 7.54.0 (including) | 7.54.0 (including) |
| Libcurl | Haxx | 7.54.1 (including) | 7.54.1 (including) |
There are many different kinds of mistakes that introduce information exposures. The severity of the error can range widely, depending on the context in which the product operates, the type of sensitive information that is revealed, and the benefits it may provide to an attacker. Some kinds of sensitive information include:
Information might be sensitive to different parties, each of which may have their own expectations for whether the information should be protected. These parties include:
Information exposures can occur in different ways:
It is common practice to describe any loss of confidentiality as an “information exposure,” but this can lead to overuse of CWE-200 in CWE mapping. From the CWE perspective, loss of confidentiality is a technical impact that can arise from dozens of different weaknesses, such as insecure file permissions or out-of-bounds read. CWE-200 and its lower-level descendants are intended to cover the mistakes that occur in behaviors that explicitly manage, store, transfer, or cleanse sensitive information.