|Description||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.|
|Source||CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)|
Vulnerable and fixed packages
The table below lists information on source packages.
|buster, buster (security)||7.64.0-4+deb10u2||fixed|
The information below is based on the following data on fixed versions.
|Package||Type||Release||Fixed Version||Urgency||Origin||Debian Bugs|
- curl <not-affected> (Windows only)
Introduced by: https://github.com/curl/curl/commit/9aefbff30d280c60fc9d8cc3e0b2f19fc70a2f28 (7.61.0)
Fixed by: https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511 (7.77.0)
Only affect builds with schannel support (which is Windows only)