Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2009-0021

Severity CVSS v4.0:
Pending analysis
Type:
CWE-287 Authentication Issues
Publication date:
07/01/2009
Last modified:
09/04/2025

Description

NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.

Impact

Vector 2.0
AV:N/AC:L/Au:N/C:P/I:N/A:N CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): None
Availability (A): None

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* 4.2.4p4 (including)
cpe:2.3:a:ntp:ntp:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.2:*:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.4p1:*:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.4p2:*:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.4p3:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools