A libcurl-gnutls security update has been released for Arch Linux.

ASA-202106-8: libcurl-gnutls: information disclosure

Arch Linux Security Advisory ASA-202106-8
========================================
Severity: Medium
Date : 2021-06-01
CVE-ID : CVE-2021-22898
Package : libcurl-gnutls
Type : information disclosure
Remote : Yes
Link :   https://security.archlinux.org/AVG-1999

Summary
======
The package libcurl-gnutls before version 7.77.0-1 is vulnerable to
information disclosure.

Resolution
=========
Upgrade to 7.77.0-1.

# pacman -Syu "libcurl-gnutls>=7.77.0-1"

The problem has been fixed upstream in version 7.77.0.

Workaround
=========
The issue can be mitigated by avoiding to use the -t command line
option and CURLOPT_TELNETOPTIONS.

Description
==========
A security issue has been found in curl before version 7.77.0. curl
supports the -t command line option, known as CURLOPT_TELNETOPTIONS in
libcurl. This rarely used option is used to send variable=content pairs
to TELNET servers. Due to 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. Therefore potentially revealing
sensitive internal information to the server using a clear-text network
protocol.

Impact
=====
curl could disclose potentially sensitive memory information to a
remote server over Telnet when an uncommon option is used.

References
=========
  https://curl.se/docs/CVE-2021-22898.html
  https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde
  https://security.archlinux.org/CVE-2021-22898