curl: A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP
CVE-2022-43551 is fixed in 13 products on 1 platform, first by curl 7.81.0-1ubuntu1.7, released December 20, 2022. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 12.15 (bookworm) | 7.86.0-3 | DEBIAN-CVE-2022-43551 | Dec 23, 2022 |
| curl · Debian 13.5 (trixie) | 7.86.0-3 | DEBIAN-CVE-2022-43551 | Dec 23, 2022 |
| curl · Debian 14 | 7.86.0-3 | DEBIAN-CVE-2022-43551 | Dec 23, 2022 |
| curl · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | curl 7.81.0-1ubuntu1.7 | Dec 20, 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) | 7.81.0-1ubuntu1.7 | libcurl3-gnutls 7.81.0-1ubuntu1.7 | Dec 20, 2022 |
| libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | libcurl3-nss 7.81.0-1ubuntu1.7 | Dec 20, 2022 |
| libcurl4 · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | libcurl4 7.81.0-1ubuntu1.7 | Dec 20, 2022 |
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