CVE-2009-0021
NTP OpenSSL EVP_VerifyFinal Signature Validation Bypass
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.
INFO
Published Date :
Jan. 7, 2009, 5:30 p.m.
Last Modified :
April 9, 2025, 12:30 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.9
Exploitability Score :
10.0
Public PoC/Exploit Available at Github
CVE-2009-0021 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2009-0021.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2009-0021 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2009-0021 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://lists.apple.com/archives/security-announce/2009/May/msg00002.html Added Reference http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html Added Reference http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html Added Reference http://secunia.com/advisories/33406 Added Reference http://secunia.com/advisories/33558 Added Reference http://secunia.com/advisories/33648 Added Reference http://secunia.com/advisories/34642 Added Reference http://secunia.com/advisories/35074 Added Reference http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.531177 Added Reference http://support.apple.com/kb/HT3549 Added Reference http://www.ocert.org/advisories/ocert-2008-016.html Added Reference http://www.redhat.com/support/errata/RHSA-2009-0046.html Added Reference http://www.securityfocus.com/archive/1/499827/100/0/threaded Added Reference http://www.securitytracker.com/id?1021533 Added Reference http://www.us-cert.gov/cas/techalerts/TA09-133A.html Added Reference http://www.vupen.com/english/advisories/2009/0042 Added Reference http://www.vupen.com/english/advisories/2009/1297 Added Reference https://lists.ntp.org/pipermail/announce/2009-January/000055.html Added Reference https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Oct. 11, 2018
Action Type Old Value New Value Removed Reference http://www.securityfocus.com/archive/1/archive/1/499827/100/0/threaded [No Types Assigned] Added Reference http://www.securityfocus.com/archive/1/499827/100/0/threaded [No Types Assigned] -
CVE Modified by [email protected]
Sep. 29, 2017
Action Type Old Value New Value Removed Reference http://oval.mitre.org/repository/data/getDef?id=oval:org.mitre.oval:def:10035 [No Types Assigned] Added Reference https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035 [No Types Assigned] -
Initial Analysis by [email protected]
Jan. 07, 2009
Action Type Old Value New Value
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2009-0021 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2009-0021
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
3.37 }} -3.34%
score
0.86213
percentile