# CVE-2023-6935: wolfssl: wolfSSL SP Math All RSA implementation is vulnerable to the Marvin Attack, new variation of a timing Bleichenbacher s...

CVE-2023-6935 is fixed in wolfssl on 1 platform by DEBIAN-CVE-2023-6935 (version 5.6.6-1.2), released February 9, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-6935
- Priority: Routine
- CVSS: 5.9 (medium)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 9, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | wolfssl Debian 13.5 (trixie) | 5.6.6-1.2 | [DEBIAN-CVE-2023-6935](https://patchblox.com/security/data/fix/linux/debian-cve-2023-6935.md) | Feb 9, 2024 |

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