Authentication Bypass Affecting curl package, versions <7.76.0-r0


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.3% (69th percentile)

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  • Snyk IDSNYK-ALPINE315-CURL-1926639
  • published15 Apr 2021
  • disclosed1 Apr 2021

Introduced: 1 Apr 2021

CVE-2021-22890  (opens in a new tab)
CWE-290  (opens in a new tab)

How to fix?

Upgrade Alpine:3.15 curl to version 7.76.0-r0 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 Alpine. See How to fix? for Alpine:3.15 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.

CVSS Scores

version 3.1