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.
Metrics
Affected Vendors & Products
References
History
No history.
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
Vulnrichment
No data.
NVD
Status : Analyzed
Published: 2021-04-01T18:15:12.917
Modified: 2024-03-27T15:47:45.160
Link: CVE-2021-22890
Redhat