Vulnerability identifier: #VU45740

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15693

CWE-ID: CWE-93

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
nim
Universal components / Libraries / Programming Languages & Components

Vendor: nim-lang.org

Description

The vulnerability allows a remote attacker to inject arbitrary data in server response.

The vulnerability exists due to insufficient validation of attacker-supplied data when processing URL in the standard library httpClient. A remote attacker can pass a specially crafted URL to the application and changes values of headers via CR-LF characters when processed with httpClient.get or httpClient.post methods.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

nim: 1.2.4

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External links
http://github.com/nim-lang/Nim/blob/dc5a40f3f39c6ea672e6dc6aca7f8118a69dda99/lib/pure/httpclient.nim#L1023
http://nim-lang.org/blog/2020/07/30/versions-126-and-108-released.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.