In Nim 1.2.4, the standard library httpClient fails to properly validate the server response. For example, httpClient.get().contentLength() does not raise any error if a malicious server provides a negative Content-Length.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
| Link | Tags |
|---|---|
| https://github.com/nim-lang/Nim/blob/dc5a40f3f39c6ea672e6dc6aca7f8118a69dda99/lib/pure/httpclient.nim#L241 | third party advisory patch |
| https://nim-lang.org/blog/2020/07/30/versions-126-and-108-released.html | third party advisory release notes |
| http://www.openwall.com/lists/oss-security/2021/02/04/2 | mailing list third party advisory exploit |
| https://consensys.net/diligence/vulnerabilities/nim-httpclient-header-crlf-injection/ | third party advisory exploit |