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Cleartext Transmission of Sensitive Information The advisory has been revoked - it doesn't affect any version of package curl  (opens in a new tab)

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EPSS
16.54% (97th percentile)

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  • Snyk IDSNYK-UBUNTU2204-CURL-3180260
  • published23 Dec 2022
  • disclosed23 Dec 2022
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Introduced: 23 Dec 2022

CVE-2022-43551  (opens in a new tab)
CWE-319  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:22.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu.

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) .. Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded.