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CVE-2021-22890 Details

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NameCVE-2021-22890
StatusCandidate
Descriptioncurl 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.
ReferencesFEDORA:FEDORA-2021-065371f385
URL: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/
FEDORA:FEDORA-2021-cab5c9befb
URL: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/
MISC: https://curl.se/docs/CVE-2021-22890.html
URL: https://curl.se/docs/CVE-2021-22890.html
MISC: https://hackerone.com/reports/1129529
URL: https://hackerone.com/reports/1129529
PhaseAssigned (20210106)
VotesNone (candidate not yet proposed)
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