PT-2021-20128 · Wolfssl+1 · Wolfssl+1

Aina Toky Rasoamanana + 1 · Published 2021-01-29 · Updated 2021-03-04 · CVE-2021-3336

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions wolfSSL versions prior to 4.7.0

Description The issue arises from the DoTls13CertificateVerify function in tls13.c, which does not properly handle anomalous peer behavior. Specifically, it continues processing when it receives an ED22519, ED448, ECC, or RSA signature without the corresponding certificate. This affects the client side, allowing man-in-the-middle attackers to impersonate TLS 1.3 servers.

Recommendations For versions prior to 4.7.0, update to version 4.7.0 or later to resolve the issue. As a temporary workaround, consider restricting the use of the DoTls13CertificateVerify function in tls13.c until a patch is available.

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

ALT-PU-2021-1353

CVE-2021-3336

Affected Products

Alt Linux

Wolfssl

References · 11

• https://github.com/wolfSSL/wolfssl/pull/3676 · Patch
• https://osv.dev/vulnerability/CVE-2021-3336 · Vendor Advisory
• https://wolfssl.com/docs/security-vulnerabilities · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3336 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-3336 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3336 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-3336 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3336 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3336 · Vendor Advisory
• https://t.me/cvenotify/9106 · Telegram Post
• https://t.me/cibsecurity/22818 · Telegram Post