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