CVE-2022-1473

The OPENSSL_LH_flush() function, which empties a hash table, contains a bug
that breaks reuse of the memory occuppied by the removed hash table
entries. This function is used when decoding certificates or keys. If a
long lived process periodically decodes certificates or keys its memory
usage will expand without bounds and the process might be terminated by the
operating system causing a denial of service. Also traversing the empty
hash table entries will take increasingly more time. Typically such long
lived processes might be TLS clients or TLS servers configured to accept
client certificate authentication. The function was added in the OpenSSL
3.0 version thus older releases are not affected by the issue. Fixed in
OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2).

Notes