PT-2024-2373 · Wolfssl+1 · Wolfssl+1

Hubert Kario + 1 · Published 2024-02-09 · Updated 2024-11-07 · CVE-2023-6935

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions wolfSSL versions prior to 3.6.6

Description The issue is related to the wolfSSL SP Math All RSA implementation being vulnerable to the Marvin Attack, a new variation of a timing Bleichenbacher style attack. This vulnerability is specific to static RSA cipher suites, which are not recommended and have been disabled by default since wolfSSL 3.6.6. 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.

Recommendations For versions prior to 3.6.6, consider disabling the static RSA cipher suites by removing the WOLFSSL STATIC RSA define or updating to a version where this is disabled by default, such as wolfSSL 3.6.6 or later. As a temporary workaround, consider restricting the use of static RSA cipher suites until a patch is available.

Fix

Side Channel Attack

Weakness Enumeration

CWE-203

Related Identifiers

BDU:2024-02324

CVE-2023-6935

Affected Products

Debian

Wolfssl

References · 15

• https://security-tracker.debian.org/tracker/CVE-2023-6935 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-6935 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-6935 · Security Note
• https://wolfssl.com/docs/security-vulnerabilities · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-6935 · Security Note
• https://bdu.fstec.ru/vul/2024-02324 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-6935 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-6935 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-6935 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl/blob/v5.6.6-stable/ChangeLog.md#vulnerabilities · Note
• https://t.me/cvenotify/100989 · Telegram Post
• https://people.redhat.com/~hkario/marvin · Note
• https://twitter.com/CVEnew/status/1756085868639428745 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1756129514290078070 · Twitter Post
• https://t.me/cvenotify/70889 · Telegram Post