CVE-2020-15694

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.

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

2.33% chance of exploitation in the next 30 days, 83rd percentile

Published

2020-08-14

Updated

2024-08-04

Proof-of-concept exploits (1)

• http://www.openwall.com/lists/oss-security/2021/02/04/2

Security advisories

• https://consensys.net/diligence/vulnerabilities/nim-httpclient-header-crlf-injection
• nim-lang/Nim/blob/dc5a40f3f39c6ea672e6dc6aca7f8118a69dda99/lib/pure/httpclient.nim#L241
• https://nim-lang.org/blog/2020/07/30/versions-126-and-108-released.html

References

• CVE Record
• NVD entry