Authentication Bypass Affecting curl package, versions <7.74.0-1.2
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Test your applications- Snyk ID SNYK-DEBIAN11-CURL-1089955
- published 31 Mar 2021
- disclosed 1 Apr 2021
Introduced: 31 Mar 2021
CVE-2021-22890 Open this link in a new tabHow to fix?
Upgrade Debian:11 curl to version 7.74.0-1.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian:11.
See How to fix? for Debian:11 relevant fixed versions and status.
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.