CVE-2023-6935

published 2024-02-09

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…

Priority P4 31 medium 5.9 CVSS 3.1

AV N AC H PR N UI N S U C H I N A N

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.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	wolfssl	< wolfssl 5.6.6-1.2 (forky)	wolfssl 5.6.6-1.2 (forky)
msrc	azl3_mariadb_10.11.6-3_on_azure_linux_3.0	—	—
msrc	azure_linux_3.0_arm	—	—
msrc	azure_linux_3.0_x64	—	—
msrc	cbl_mariner_2.0_arm	—	—
msrc	cbl_mariner_2.0_x64	—	—
wolfssl	wolfssl	>= 0 < 5.6.6-1.2	5.6.6-1.2
wolfssl	wolfssl	>= 0 < 5.6.6-1.2	5.6.6-1.2
wolfssl	wolfssl	3.12.2 – 5.6.4	—

CVSS provenance

nvd v3.1 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

osv 5.9 MEDIUM

vendor_debian 5.9 LOW

vendor_msrc 5.9 MEDIUM

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