CVE-2023-6935
Marvin Attack vulnerability in SP Math All RSA
- State
- Published
- Severity
- 5.9 Medium
- Published
- Feb 9, 2024
- Updated
- Aug 2, 2024
- Reserved
- Dec 18, 2023
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N | wolfSSL |
Weaknesses
- CWE-203 Observable Discrepancy
Affected Products
| Product | Versions |
|---|---|
wolfSSLwolfSSL |
|
References
- https://people.redhat.com/~hkario/marvin/technical-descriptionthird-party-advisory
- https://www.wolfssl.com/docs/security-vulnerabilities/
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