curl: In curl before 7.86.0, the HSTS check could be bypassed to trick it into staying with HTTP
CVE-2022-42916 is fixed in 13 products on 1 platform, first by curl 7.81.0-1ubuntu1.6, released October 26, 2022. It is not reported as exploited. Patch Radar priority: High.
In curl before 7.86.0, the HSTS check could be bypassed to trick it into staying with HTTP. Using its HSTS support, curl can be instructed to use HTTPS directly (instead of using an insecure cleartext HTTP step) even when HTTP is provided in the URL. This mechanism could be bypassed if the host name in the given URL uses IDN characters that get replaced with ASCII counterparts as part of the IDN conversion, e.g., using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop of U+002E (.). The earliest affected version is 7.77.0 2021-05-26.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 12.15 (bookworm) | 7.86.0-1 | DEBIAN-CVE-2022-42916 | Oct 29, 2022 |
| curl · Debian 13.5 (trixie) | 7.86.0-1 | DEBIAN-CVE-2022-42916 | Oct 29, 2022 |
| curl · Debian 14 | 7.86.0-1 | DEBIAN-CVE-2022-42916 | Oct 29, 2022 |
| curl · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | curl 7.81.0-1ubuntu1.6 | Oct 26, 2022 |
| curl · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| curl-debuginfo · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| curl-debugsource · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| curl-minimal · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| curl-minimal-debuginfo · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| libcurl · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| libcurl-debuginfo · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| libcurl-devel · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| libcurl-minimal · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| libcurl-minimal-debuginfo · amzn 2023 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 | Feb 17, 2023 |
| libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | libcurl3-gnutls 7.81.0-1ubuntu1.6 | Oct 26, 2022 |
| libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | libcurl3-nss 7.81.0-1ubuntu1.6 | Oct 26, 2022 |
| libcurl4 · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | libcurl4 7.81.0-1ubuntu1.6 | Oct 26, 2022 |
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