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Vulnerability Details : CVE-2009-0021

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.
Publish Date : 2009-01-07 Last Update Date : 2018-10-11
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID 287

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate
AV:N/AC:M/Au:N/C:P/I:N/A:N 2008-12-16 2009-01-07
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- Related OVAL Definitions

Title Definition Id Class Family
CVE-2009-0021 unix
DSA-1702 ntp -- interpretation conflict oval:org.mitre.oval:def:7079 unix
DSA-1702-1 ntp -- interpretation conflict oval:org.mitre.oval:def:13252 unix
ELSA-2009:0046: ntp security update (Moderate) oval:org.mitre.oval:def:22471 unix
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_Verify... oval:org.mitre.oval:def:10035 unix
RHSA-2009:0046 -- ntp security update (Moderate) oval:org.mitre.oval:def:28923 unix
RHSA-2009:0046: ntp security update (Moderate) oval:com.redhat.rhsa:def:20090046 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2009-0021

# Product Type Vendor Product Version Update Edition Language
1 Application NTP NTP 4.2.0 Version Details Vulnerabilities
2 Application NTP NTP 4.2.2 Version Details Vulnerabilities
3 Application NTP NTP 4.2.4p2 Version Details Vulnerabilities
4 Application NTP NTP 4.2.4p3 Version Details Vulnerabilities
5 Application NTP NTP 4.2.4p4 Version Details Vulnerabilities
6 Application NTP NTP 4.2.4p1 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions

- References For CVE-2009-0021
MLIST [announce] 20090108 NTP 4.2.4p6 Released
VUPEN ADV-2009-0042
CERT TA09-133A
SUSE SUSE-SR:2009:008
REDHAT RHSA-2009:0046
BUGTRAQ 20090107 [oCERT-2008-016] Multiple OpenSSL signature verification API misuses
SECTRACK 1021533
SUSE SUSE-SR:2009:005
APPLE APPLE-SA-2009-05-12
VUPEN ADV-2009-1297

- Metasploit Modules Related To CVE-2009-0021

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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