|Description||curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.|
|Source||CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)|
Vulnerable and fixed packages
The table below lists information on source packages.
|buster, buster (security)||7.64.0-4+deb10u2||fixed|
|bookworm, sid, bullseye||7.74.0-1.3||fixed|
The information below is based on the following data on fixed versions.
|Package||Type||Release||Fixed Version||Urgency||Origin||Debian Bugs|
- curl <not-affected> (Incomplete fix for CVE-2021-22898 not applied)
Introduced by: https://github.com/curl/curl/commit/a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 (curl-7_7_alpha2)
Fixed by: https://github.com/curl/curl/commit/894f6ec730597eb243618d33cc84d71add8d6a8a (curl-7_78_0)
CVE is assigned because previous attempt to address CVE-2021-22898 resulted to be
insufficient and the security vulnerability remained.