CVE-2024-2511

Name	CVE-2024-2511
Description	Issue summary: 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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3942-1
Debian Bugs	1068658

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openssl (PTS)	bullseye	1.1.1w-0+deb11u1	fixed
	bullseye (security)	1.1.1w-0+deb11u2	fixed
	bookworm	3.0.15-1~deb12u1	fixed
	bookworm (security)	3.0.14-1~deb12u2	fixed
	sid, trixie	3.3.2-2	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
openssl	source	experimental	3.3.0-1
openssl	source	bullseye	1.1.1n-0+deb11u6	DLA-3942-1
openssl	source	bookworm	3.0.14-1~deb12u1
openssl	source	(unstable)	3.2.2-1		1068658

Notes

[buster] - openssl <postponed> (Minor issue, fix along with next update round)
https://www.openssl.org/news/secadv/20240408.txt
https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08 (openssl-3.2.y)
https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce (openssl-3.1.y)
https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d (openssl-3.0.y)