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FreeBSD: VID-D10FC771-958F-11EB-9C34-080027F515EA (CVE-2021-22890): curl -- TLS 1.3 session ticket proxy host mixup

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FreeBSD: VID-D10FC771-958F-11EB-9C34-080027F515EA (CVE-2021-22890): curl -- TLS 1.3 session ticket proxy host mixup

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
03/31/2021
Created
11/08/2022
Added
11/04/2022
Modified
11/04/2022

Description

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.

Solution(s)

  • freebsd-upgrade-package-curl

References

  • CVE-2021-22890
  • USN-4898-1

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