CVE-2021-22897

NameCVE-2021-22897
Descriptioncurl 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)buster7.64.0-4+deb10u2fixed
buster (security)7.64.0-4+deb10u9fixed
bullseye (security), bullseye7.74.0-1.3+deb11u11fixed
bookworm, bookworm (security)7.88.1-10+deb12u5fixed
trixie8.5.0-2fixed
sid8.7.1-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsource(unstable)(not affected)

Notes

- curl <not-affected> (Windows only)
https://curl.se/docs/CVE-2021-22897.html
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)

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