Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2009-0021

Improper Authentication

Published: Jan 07, 2009 | Modified: Apr 09, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N
RedHat/V2
4.3 MODERATE
AV:N/AC:M/Au:N/C:P/I:N/A:N
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2009-0021
CWEhttps://cwe.mitre.org/data/definitions/287.html

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.

Weakness

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected Software

NameVendorStart VersionEnd Version
NtpNtp*4.2.4p4 (including)
NtpNtp4.2.0 (including)4.2.0 (including)
NtpNtp4.2.2 (including)4.2.2 (including)
NtpNtp4.2.4p1 (including)4.2.4p1 (including)
NtpNtp4.2.4p2 (including)4.2.4p2 (including)
NtpNtp4.2.4p3 (including)4.2.4p3 (including)
Red Hat Enterprise Linux 4RedHatntp-0:4.2.0.a.20040617-8.el4_7.1*
Red Hat Enterprise Linux 5RedHatntp-0:4.2.2p1-9.el5_3.1*
NtpUbuntudapper*
NtpUbuntudevel*
NtpUbuntugutsy*
NtpUbuntuhardy*
NtpUbuntuintrepid*
NtpUbuntuupstream*

Potential Mitigations

References

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