PT-2024-15131 · Wolfssl+1 · Wolfssl+1

Johannes Wilson · Published 2024-02-15 · Updated 2025-02-21 · CVE-2023-6937

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions wolfSSL versions prior to 5.6.6

Description The issue arises from the failure to check that messages in one (D)TLS record do not span key boundaries, allowing the combination of (D)TLS messages using different keys into one (D)TLS record. In the most extreme case, in (D)TLS 1.3, an unencrypted (D)TLS 1.3 record from the server containing a ServerHello message and the rest of the first server flight could be accepted by a wolfSSL client. Although this does not compromise key negotiation and authentication, it poses a security risk.

Recommendations For wolfSSL versions prior to 5.6.6, update to version 5.6.6 or later to resolve the issue. As a temporary workaround, consider restricting the use of (D)TLS 1.3 records to minimize the risk of exploitation. Avoid using unencrypted flights from the server in (D)TLS 1.3 until the issue is resolved.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2023-6937

Affected Products

Debian

Wolfssl

References · 15

• https://github.com/wolfSSL/wolfssl/pull/7029 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-6937 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2023-6937 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-6937 · Vendor Advisory
• https://wolfssl.com/docs/security-vulnerabilities · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-6937 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-6937 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-6937 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-6937 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl/blob/v5.6.6-stable/ChangeLog.md#vulnerabilities · Note
• https://t.me/cvenotify/71650 · Telegram Post
• https://twitter.com/CVEnew/status/1758181417421345268 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1758211985517256739 · Twitter Post
• https://t.me/cvenotify/112002 · Telegram Post
• https://t.me/cvenotify/71617 · Telegram Post