CVE-2023-6935: Marvin Attack vulnerability in SP Math All RSA
First published: Fri Feb 09 2024(Updated: )
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.
Credit: facts@wolfssl.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| wolfSSL wolfMQTT | >=3.12.2<=5.6.4 |
Remedy
Upgrade wolfSSL to 5.6.6
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2023-6935?
CVE-2023-6935 has been classified as a high severity vulnerability due to its potential impact on RSA security.
How do I fix CVE-2023-6935?
To fix CVE-2023-6935, it is recommended to disable the WOLFSSL_STATIC_RSA option in your configuration.
What systems are affected by CVE-2023-6935?
CVE-2023-6935 affects wolfSSL versions between 3.12.2 and 5.6.4 that have been configured with the --enable-all option and WOLFSSL_STATIC_RSA defined.
What attack does CVE-2023-6935 relate to?
CVE-2023-6935 is related to the Marvin Attack, which is a new variation of a timing attack similar to the Bleichenbacher attack.
What is the impact of CVE-2023-6935?
The impact of CVE-2023-6935 includes potential unauthorized access or decryption of sensitive information using RSA keys.
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