Microsoft Windows numeric error

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Microsoft Windows. This issue affects some unknown processing. Performing a manipulation results in numeric error. This vulnerability is cataloged as CVE-2009-2511. Furthermore, there is an exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Microsoft Windows (Operating System) (the affected version is unknown). This affects an unknown code. The manipulation with an unknown input leads to a numeric error vulnerability. CWE is classifying the issue as CWE-189. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow in the CryptoAPI component in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows man-in-the-middle attackers to spoof arbitrary SSL servers and other entities via an X.509 certificate that has a malformed ASN.1 Object Identifier (OID) and was issued by a legitimate Certification Authority, aka "Integer Overflow in X.509 Object Identifiers Vulnerability."

The weakness was shared 10/14/2009 (Website). It is possible to read the advisory at us-cert.gov. This vulnerability is uniquely identified as CVE-2009-2511 since 07/17/2009. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available.

It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 42112 (MS09-056: Vulnerabilities in Windows CryptoAPI Could Allow Spoofing (974571)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90552 (Microsoft Windows CryptoAPI Spoofing Vulnerability (MS09-056)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8670.

The vulnerability is also documented in the databases at X-Force (53537), Tenable (42112), SecurityFocus (BID 36475†) and Vulnerability Center (SBV-23737†). The entries VDB-50451, VDB-50449, VDB-50448 and VDB-50447 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
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: Numeric error
CWE: CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 42112
Nessus Name: MS09-056: Vulnerabilities in Windows CryptoAPI Could Allow Spoofing (974571)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 900876
OpenVAS Name: Microsoft Windows CryptoAPI X.509 Spoofing Vulnerabilities (974571)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

07/17/2009 🔍
10/13/2009 +88 days 🔍
10/13/2009 +0 days 🔍
10/13/2009 +0 days 🔍
10/14/2009 +1 days 🔍
10/14/2009 +0 days 🔍
10/14/2009 +0 days 🔍
03/18/2015 +1981 days 🔍
11/13/2025 +3893 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: us-cert.gov
Status: Confirmed

CVE: CVE-2009-2511 (🔍)
GCVE (CVE): GCVE-0-2009-2511
GCVE (VulDB): GCVE-100-50439

OVAL: 🔍
IAVM: 🔍

X-Force: 53537
SecurityFocus: 36475
Vulnerability Center: 23737 - [MS09-056] Windows CryptoAPI Integer Overflow in X.509 Object Identifiers Spoofing Vulnerability, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 03/18/2015 15:15
Updated: 11/13/2025 06:36
Changes: 03/18/2015 15:15 (66), 09/18/2018 08:41 (13), 08/23/2021 19:54 (3), 11/13/2025 06:36 (24)
Complete: 🔍
Cache ID: 216::103

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