Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wolfssl | Wolfssl | >= 3.12.2, <= 5.6.4 |
Related Weaknesses (CWE)
References
- https://people.redhat.com/~hkario/marvin/Technical Description
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
- https://people.redhat.com/~hkario/marvin/Technical Description
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
FAQ
What is CVE-2023-6935?
CVE-2023-6935 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 CFLA...
How severe is CVE-2023-6935?
CVE-2023-6935 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-6935?
Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.