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CVE-2021-22898

Published: 26 May 2021

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.

Priority

Low

Cvss 3 Severity Score

3.1

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
bionic
Released (7.58.0-2ubuntu3.14)
focal
Released (7.68.0-1ubuntu2.6)
groovy Ignored
(end of life)
hirsute
Released (7.74.0-1ubuntu2.1)
impish
Released (7.74.0-1.2ubuntu4)
jammy
Released (7.74.0-1.2ubuntu4)
kinetic
Released (7.74.0-1.2ubuntu4)
lunar
Released (7.74.0-1.2ubuntu4)
trusty
Released (7.35.0-1ubuntu2.20+esm14)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (7.77.0)
xenial
Released (7.47.0-1ubuntu2.19+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
Patches:
upstream: https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde

Severity score breakdown

Parameter Value
Base score 3.1
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N