CVE-2021-22890

curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.

• haxx libcurl (>= 7.63.0 <= 7.75.0) • fedoraproject fedora 32 • fedoraproject fedora 33 • fedoraproject fedora 34 • netapp hci management node • netapp solidfire • netapp hci storage node • broadcom fabric operating system • debian debian linux 9.0 • siemens sinec infrastructure network services (< 1.0.1.1) • oracle communications billing and revenue management 12.0.0.3.0 • oracle essbase 21.2 • splunk universal forwarder (>= 8.2.0 < 8.2.12) • splunk universal forwarder (>= 9.0.0 < 9.0.6) • splunk universal forwarder 9.1.0