CVE-2021-41259

Name	CVE-2021-41259
Description	Nim is a systems programming language with a focus on efficiency, expressiveness, and elegance. In affected versions the uri.parseUri function which may be used to validate URIs accepts null bytes in the input URI. This behavior could be used to bypass URI validation. For example: parseUri("http://localhost\0hello").hostname is set to "localhost\0hello". Additionally, httpclient.getContent accepts null bytes in the input URL and ignores any data after the first null byte. Example: getContent("http://localhost\0hello") makes a request to localhost:80. An attacker can use a null bytes to bypass the check and mount a SSRF attack.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs	1014714

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nim (PTS)	buster	0.19.4-1	vulnerable
	bullseye	1.4.6+really1.4.2-2	vulnerable
	sid	1.6.6-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nim	source	(unstable)	(unfixed)			1014714

Notes

[bullseye] - nim <no-dsa> (Minor issue)
[buster] - nim <no-dsa> (Minor issue)
[stretch] - nim <no-dsa> (Minor issue)
https://github.com/nim-lang/security/security/advisories/GHSA-3gg2-rw3q-qwgc