CVE-2023-6935

wolfSSL SP Math All RSA implementation is vulnerable to the Marvin Attack,
new variation of a timing Bleichenbacher style attack, when built with the
following options to configure: --enable-all CFLAGS=“-DWOLFSSL_STATIC_RSA”
The define “WOLFSSL_STATIC_RSA” enables static RSA cipher suites, which is
not recommended, and has been disabled by default since wolfSSL 3.6.6.
Therefore the default build since 3.6.6, even with “–enable-all”, is not
vulnerable to the Marvin Attack. The vulnerability is specific to static
RSA cipher suites, and expected to be padding-independent. The
vulnerability allows an attacker to decrypt ciphertexts and forge
signatures after probing with a large number of test observations. However
the server’s private key is not exposed.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059357&gt;