CVE-2021-22924

Published: 21 July 2021

libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.

Notes

introduced in 7.10.4

although the issue was introduced in 7.10.4, versions
earlier than 7.52.0 would need at least parts of commit
cb4e2be7 so the fix for this CVE can be applied. this
change seems quite intrusive and there is a high risk of
regressions. hence, versions earlier than 7.52 will be
ignored.

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22924
• https://curl.se/docs/CVE-2021-22924.html
• https://ubuntu.com/security/notices/USN-5021-1
• NVD
• Launchpad
• Debian