CVE-2024-0202 Cryptlib: rsa key exchange ciphersuites in tls vulnerable to marvin attack
Attackers can decrypt RSA ciphertexts or forge signatures via timing attacks if RSA key exchange ciphersuites are explicitly enabled in the cryptlib library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-0202?
CVE-2024-0202 is a medium-severity vulnerability in cryptlib:cryptlib, published on 5 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been identified in the cryptlib cryptographic library when cryptlib is compiled with the support for RSA key exchange ciphersuites in TLS (by setting the USE_RSA_SUITES define), it will be vulnerable to the timing variant of the Bleichenbacher attack. An attacker that is able to perform a large number of connections to the server will be able to decrypt RSA ciphertexts or forge signatures using server's certificate. THIS CVE ID IS CURRENTLY DISPUTED - MAINTAINER NOTE: There are only two situations where it's enabled, one is for fuzz-testing to exercise code paths that wouldn't otherwise be available, the other is for static source code analysis with tools like Coverity and Prefast, again to open up code paths that otherwise wouldn't be available. It can also be enabled manually in two specific test builds just to make sure the code still compiles OK, to avoid bit rot and verify that the fuzz-testing build will compile without errors.
Which versions are affected by CVE-2024-0202?
It affects 1 product.
Products include Cryptlib Cryptlib.
How do I fix CVE-2024-0202?
No fix has been published for CVE-2024-0202 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-0202 being exploited?
There is no known exploitation of CVE-2024-0202 in the wild and no public exploit code.
Other vulnerabilities in cryptlib:cryptlib
Sources
Also known as GHSA-2wff-jj2f-98c4.