CVE-2021-22898

Name	CVE-2021-22898
Description	curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.
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)
References	DLA-2734-1, DSA-5197-1
Debian Bugs	989228

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
curl (PTS)	buster, buster (security)	7.64.0-4+deb10u2	vulnerable
	bullseye	7.74.0-1.3+deb11u1	vulnerable
	bullseye (security)	7.74.0-1.3+deb11u2	fixed
	bookworm, sid	7.84.0-2	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
curl	source	stretch	7.52.1-5+deb9u15	DLA-2734-1
curl	source	bullseye	7.74.0-1.3+deb11u2	DSA-5197-1
curl	source	(unstable)	7.79.1-1		989228

Notes

[buster] - curl <no-dsa> (Minor issue)
https://curl.se/docs/CVE-2021-22898.html
Introduced by: https://github.com/curl/curl/commit/a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 (7.7)
Fixed by: https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde (7.77.0)
Followup to not make curl vulnerable to CVE-2021-22925:
https://github.com/curl/curl/commit/894f6ec730597eb243618d33cc84d71add8d6a8a (curl-7_78_0)