NTP up to 4.2.4p4 EVP_VerifyFinal improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in NTP up to 4.2.4p4. Affected by this issue is the function EVP_VerifyFinal. Such manipulation leads to improper authentication. This vulnerability is traded as CVE-2009-0021. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in NTP up to 4.2.4p4 (Network Management Software). Affected by this issue is the function EVP_VerifyFinal. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality. CVE summarizes:

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.

The weakness was shared 01/07/2009 with Google Security Team (Website). The advisory is available at us-cert.gov. This vulnerability is handled as CVE-2009-0021 since 12/15/2008. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 80395 (OracleVM 2.2 : ntp (OVMSA-2015-0002)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 117157 (CentOS Security Update for NTP (CESA-2009:0046)).

Upgrading to version 4.2.4p2 eliminates this vulnerability. A possible mitigation has been published 7 years after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (47836), Tenable (80395), SecurityFocus (BID 33150†), Secunia (SA34642†) and SecurityTracker (ID 1021533†). The entries VDB-3904, VDB-3978, VDB-23858 and VDB-30376 are related to this item. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 80395
Nessus Name: OracleVM 2.2 : ntp (OVMSA-2015-0002)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 63149
OpenVAS Name: Debian Security Advisory DSA 1702-1 (ntp)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: NTP 4.2.4p2

Timelineinfo

12/15/2008 🔍
01/07/2009 +23 days 🔍
01/07/2009 +0 days 🔍
01/07/2009 +0 days 🔍
01/07/2009 +0 days 🔍
01/18/2009 +11 days 🔍
04/08/2009 +80 days 🔍
01/06/2015 +2099 days 🔍
01/07/2015 +1 days 🔍
03/17/2015 +69 days 🔍
05/23/2025 +3719 days 🔍

Sourcesinfo

Advisory: us-cert.gov
Organization: Google Security Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2009-0021 (🔍)
GCVE (CVE): GCVE-0-2009-0021
GCVE (VulDB): GCVE-100-45794

OVAL: 🔍

X-Force: 47836
SecurityFocus: 33150 - OpenSSL 'EVP_VerifyFinal' Function Signature Verification Vulnerability
Secunia: 34642 - SUSE Update for Multiple Packages, Highly Critical
SecurityTracker: 1021533
Vulnerability Center: 20516 - NTP 4.2.4 - 4.2.4p5 and 4.2.5 - 4.2.5p150 Remote Certificate Chain Validation Bypass, Medium
Vupen: ADV-2009-0042

See also: 🔍

Entryinfo

Created: 03/17/2015 16:11
Updated: 05/23/2025 00:22
Changes: 03/17/2015 16:11 (69), 07/10/2018 09:04 (16), 05/23/2025 00:22 (22)
Complete: 🔍
Cache ID: 216::103

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