CVE-2021-3450

Katalog CVE

CVSS 7.4 · High EPSS 18,3%

Kerentanan Improper Certificate Validation pada openssl, freebsd +31 lainnya. Skor CVSS 3.1 7.4 (High) menurut NVD.

Deskripsi (NVD)

The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a "purpose" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named "purpose" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).

Rincian

Terbit di NVD

25 Maret 2021

Terakhir diubah

8 Oktober 2026

Status NVD

Modified

CVSS 3.1

7.4 (High), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-295: Improper Certificate Validation

EPSS (30 hari)

18,3% peluang dieksploitasi; lebih tinggi dari 97,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html mailing list · advisory vendor
• https://www.openssl.org/news/secadv/20210325.txt advisory vendor
• https://www.oracle.com//security-alerts/cpujul2021.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpuApr2021.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpuapr2022.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpujul2022.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpuoct2021.html patch · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/03/27/1 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/03/27/2 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/03/28/3 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/03/28/4 mailing list · advisory pihak ketiga
• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf advisory pihak ketiga
• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845 advisory pihak ketiga
• https://kc.mcafee.com/corporate/index?page=content&id=SB10356 advisory pihak ketiga
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013 advisory pihak ketiga
• https://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc advisory pihak ketiga
• https://security.gentoo.org/glsa/202103-03 advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210326-0006/ advisory pihak ketiga
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd advisory pihak ketiga
• https://www.tenable.com/security/tns-2021-05 advisory pihak ketiga
• https://www.tenable.com/security/tns-2021-08 advisory pihak ketiga
• https://www.tenable.com/security/tns-2021-09 advisory pihak ketiga
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIV...