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CVE-2021-22897

Published: 11 June 2021

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

Priority

Negligible

CVSS 3 base score: 5.3

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

groovy Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

trusty Not vulnerable

upstream
Released (7.77.0)
xenial Not vulnerable

Notes

AuthorNote
seth-arnold
only affects builds with SCHANNEL -- I believe that requires windows.

References

Bugs