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vulnerability CVE-2009-2510 CVE-2009-2511
Windows, IE: incorrect validation of X.509
Synthesis of the vulnerability
| An attacker can invite the victim to connect to a SSL site using a X.509 certificate with a malicious field, in order to deceive the victim. |
Severity: 2/4.
Consequences: data reading.
Provenance: internet server.
Means of attack: 1 attack.
Ability of attacker: technician (2/4).
Confidence: confirmed by the editor (5/5).
Diffusion of the vulnerable configuration: high (3/3).
Number of vulnerabilities in this bulletin: 2.
Creation date: 01/10/2009.
Revisions dates: 02/10/2009, 06/10/2009.
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Impacted products
Description of the vulnerability
Internet Explorer uses the CryptoAPI of Windows to manage SSL/TLS certificates. Other applications use this CryptoAPI, which is impacted by two vulnerabilities.
When a X.509 certificate contains a null character in the Common Name field, the CryptoAPI truncates this field. This vulnerability is similar to VIGILANCE-VUL-8908, even if the vulnerable source code is different. [severity:2/4; BID-36475, CVE-2009-2510, REJ-2009-3454, >]
OIDs (Object IDentifiers) indicate fields of a X.509 certificate. The "Common Name" field is indicated by the OID 2.5.4.3. The 2.5.4.0003 and 2.5.4.2^64.3 OIDs are invalid. However, the CryptoAPI recognizes them as 2.5.4.3, and thus interpret them as the CN. [severity:2/4; BID-36577, CVE-2009-2511, >]
An attacker can therefore invite the victim to connect to a SSL site using a X.509 certificate with a malicious field, in order to deceive the victim. |
Characteristics
Title: Windows, IE: incorrect validation of X.509
Identifiers: 974571, BID-36475, BID-36577, CVE-2009-2510, CVE-2009-2511, MS09-056, REJ-2009-3454, VIGILANCE-VUL-9060.
Url: https://vigilance.fr/tree/1/9060
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Information sources
Solutions for this vulnerability
Supplements
Vulnerability : NULL
When a X.509 certificate contains a null character in the Common Name field, the CryptoAPI truncates this field. This vulnerability is similar to VIGILANCE-VUL-8908, even if the vulnerable source code is different.
Severity: 2/4.
Identifiers: BID-36475, CVE-2009-2510, REJ-2009-3454.
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Vulnerability : OID
OIDs (Object IDentifiers) indicate fields of a X.509 certificate. The "Common Name" field is indicated by the OID 2.5.4.3. The 2.5.4.0003 and 2.5.4.2^64.3 OIDs are invalid. However, the CryptoAPI recognizes them as 2.5.4.3, and thus interpret them as the CN.
Severity: 2/4.
Identifiers: BID-36577, CVE-2009-2511.
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