CVE-2022-43551

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.

Affected products

Alt Linux, Debian, Ibm Aix, Linuxmint, Apple Macos, Mysql Server, Red Os, Suse

Haxx Curl

< 7.87.0

Fix

Available

CVSS 3.1

7.5 HIGH

EPSS

16.5% (97th percentile)

Weakness

CWE-319

NVD status

Modified

Published

2022-12-23

No exploit for CVE-2022-43551 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.