Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.
Created edk2 tracking bugs for this issue: Affects: fedora-all [bug 2274024] Created openssl tracking bugs for this issue: Affects: fedora-all [bug 2274023] Created openssl11 tracking bugs for this issue: Affects: epel-all [bug 2274022] Created openssl3 tracking bugs for this issue: Affects: epel-all [bug 2274021]
Upstream commit for this issue: https://github.com/openssl/openssl/commit/7984fa683e9dfac0cad50ef2a9d5a13330222044 https://github.com/openssl/openssl/commit/21df7f04f6c4a560b4de56d10e1e58958c7e566d https://github.com/openssl/openssl/commit/4a3e8f08306c64366318e26162ae0a0eb7b1a006