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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published: 2021-04-01T17:46:17

Updated: 2024-08-03T18:58:25.687Z

Reserved: 2021-01-06T00:00:00

Link: CVE-2021-22890

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-04-01T18:15:12.917

Modified: 2024-03-27T15:47:45.160

Link: CVE-2021-22890

cve-icon Redhat

Severity : Low

Publid Date: 2021-03-31T00:00:00Z

Links: CVE-2021-22890 - Bugzilla