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Authentication Bypass Affecting curl package, versions <7.64.0-4+deb10u2

0.0
low

Snyk CVSS

    Attack Complexity High

    Threat Intelligence

    EPSS 0.55% (78th percentile)
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NVD
3.7 low
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SUSE
3.1 low
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Red Hat
3.7 low

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  • Snyk ID SNYK-DEBIAN10-CURL-1089958
  • published 31 Mar 2021
  • disclosed 1 Apr 2021
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Introduced: 31 Mar 2021

CVE-2021-22890 Open this link in a new tab
CWE-290 Open this link in a new tab

How to fix?

Upgrade Debian:10 curl to version 7.64.0-4+deb10u2 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. See How to fix? for Debian:10 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.

References