CVE-2024-12797 RFC7250 handshakes with unauthenticated servers don't abort as expected
Attackers can perform man-in-the-middle attacks against TLS clients using Raw Public Keys if server authentication failures are not explicitly checked.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-12797?
CVE-2024-12797 is a medium-severity vulnerability in OpenSSL, published on 11 Feb 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Issue summary: Clients using RFC7250 Raw Public Keys (RPKs) to authenticate a server may fail to notice that the server was not authenticated, because handshakes don't abort as expected when the SSL_VERIFY_PEER verification mode is set.
Impact summary: TLS and DTLS connections using raw public keys may be vulnerable to man-in-middle attacks when server authentication failure is not detected by clients.
RPKs are disabled by default in both TLS clients and TLS servers. The issue only arises when TLS clients explicitly enable RPK use by the server, and the server, likewise, enables sending of an RPK instead of an X.509 certificate chain. The affected clients are those that then rely on the handshake to fail when the server's RPK fails to match one of the expected public keys, by setting the verification mode to SSL_VERIFY_PEER.
Clients that enable server-side raw public keys can still find out that raw public key verification failed by calling SSL_get_verify_result(), and those that do, and take appropriate action, are not affected. This issue was introduced in the initial implementation of RPK support in OpenSSL 3.2.
The FIPS modules in 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.
Weakness: CWE-392
Which versions are affected by CVE-2024-12797?
3 open source packages ship an affected version, including cryptography.
| Package | Affected | Fixed in |
|---|---|---|
cryptography PyPI | From 42.0.0 | 44.0.1 |
cryptography PyPI | From 42.0.0 | 44.0.1 |
cryptography PyPI | From 42.0.0 | 44.0.1 |
Linux distribution packages (23)
openssl AlmaLinux:9 | All versions | 1:3.2.2-6.el9_5.1 |
openssl-devel AlmaLinux:9 | All versions | 1:3.2.2-6.el9_5.1 |
openssl-libs AlmaLinux:9 | All versions | 1:3.2.2-6.el9_5.1 |
openssl-perl AlmaLinux:9 | All versions | 1:3.2.2-6.el9_5.1 |
openssl Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-debuginfo Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-debugsource Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-devel Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-libs Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-libs-debuginfo Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-perl Red Hat:enterprise_linux:10.0 | All versions | 1:3.2.2-16.el10 |
openssl-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 1:3.2.2-6.el9_5.1 |
openssl-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 1:3.2.2-6.el9_5.1 |
openssl-devel Red Hat:enterprise_linux:9::appstream | All versions | 1:3.2.2-6.el9_5.1 |
openssl-libs-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 1:3.2.2-6.el9_5.1 |
openssl-perl Red Hat:enterprise_linux:9::appstream | All versions | 1:3.2.2-6.el9_5.1 |
openssl Red Hat:enterprise_linux:9::baseos | All versions | 1:3.2.2-6.el9_5.1 |
openssl-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 1:3.2.2-6.el9_5.1 |
openssl-debugsource Red Hat:enterprise_linux:9::baseos | All versions | 1:3.2.2-6.el9_5.1 |
openssl-libs Red Hat:enterprise_linux:9::baseos | All versions | 1:3.2.2-6.el9_5.1 |
openssl-libs-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 1:3.2.2-6.el9_5.1 |
openssl Rocky Linux:9 | All versions | 1:3.2.2-6.el9_5.1 |
openssl-3 openSUSE:Tumbleweed | All versions | 3.2.4-1.1 |
How do I fix CVE-2024-12797?
Upgrade cryptography to 44.0.1 or later.
Is CVE-2024-12797 being exploited?
There is no known exploitation of CVE-2024-12797 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2024-12797, ALSA-2025:1330, AZL-56761, AZL-56774, AZL-78591, BELL-CVE-2024-12797 and 19 more.