CVE-2002-0862

CVE Descriptions

The (1) CertGetCertificateChain, (2) CertVerifyCertificateChainPolicy, and (3) WinVerifyTrust APIs within the CryptoAPI for Microsoft products including Microsoft Windows 98 through XP, Office for Mac, Internet Explorer for Mac, and Outlook Express for Mac, do not properly verify the Basic Constraints of intermediate CA-signed X.509 certificates, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack for SSL sessions, as originally reported for Internet Explorer and IIS.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-295	Improper Certificate Validation The product does not validate, or incorrectly validates, a certificate.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	6.8		AV:N/AC:M/Au:N/C:P/I:P/A:P	nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	20.65%	–	–
2022-04-03	–	–	20.65%	–	–
2023-02-26	–	–	20.65%	–	–
2023-03-12	–	–	–	3.73%	–
2023-07-16	–	–	–	3.73%	–
2024-01-21	–	–	–	3.44%	–
2024-02-11	–	–	–	14.97%	–
2024-06-02	–	–	–	14.97%	–
2024-12-22	–	–	–	8.28%	–
2025-02-16	–	–	–	6.08%	–
2025-01-19	–	–	–	8.28%	–
2025-02-16	–	–	–	6.08%	–
2025-03-18	–	–	–	–	22.35%
2025-03-30	–	–	–	–	20.15%
2025-03-30	–	–	–	–	20.15,%

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Date	Percentile
2022-02-06	94%
2022-04-03	96%
2023-02-26	97%
2023-03-12	9%
2023-07-16	91%
2024-01-21	91%
2024-02-11	96%
2024-06-02	96%
2024-12-22	94%
2025-02-16	94%
2025-01-19	94%
2025-02-16	94%
2025-03-18	95%
2025-03-30	95%
2025-03-30	95%

Exploit information

Exploit Database EDB-ID : 21692

Publication date : 2002-08-05 22h00 +00:00
Author : Mike Benham
EDB Verified : Yes

source: https://www.securityfocus.com/bid/5410/info A flaw has been reported in the handling of X.509 certificates by a number of products, including several web browsers. It may be possible for a malicious party to create certificates for arbitrary domains, which will be treated as trusted by the vulnerable browser. The flaw lies in the handling of intermediate certificate authorities. Normally, intermediate certificates should possess a Basic Constraints field which states the certificate may be used as a signing authority. Vulnerable products do not require the Basic Constraints field be properly defined. A malicious party with one valid certificate may sign a new certificate for an arbitrary domain. This may allow the attacker to spoof a sensitive domain, or to attempt a man-in-the-middle attack against encrypted communications. This vulnerability was originally reported in Microsoft's Internet Explorer web browser. It has been reported that, in the case of Microsoft Internet Explorer, the flaw lies in some cryptographic functions implemented in the operating system. It should be noted that this flaw has not been reported in the Cryptographic API included with Microsoft Windows. Reports state that IIS 5.0 under Windows 2000 is also vulnerable. In this case, client certificate chains are not properly verified. Attackers may exploit this vulnerability to bypass some authentication schemes. This vulnerability also exists in some versions of KDE and the included Konqueror web browser. Versions 3.0.2 and earlier are vulnerable. ** A report suggests that the patch issued by Microsoft may not fully protect against this vulnerability. It may be possible that a malicious site using an invalid certificate may mislead users into believing that a certificate is expired rather than being invalid. ** UPDATE 11/11/03 - Microsoft has updated their bulletin for this issue. Users who installed Internet Explorer 6 after installing Windows 2000 Service Pack 4 may have reintroduced this issue onto their systems. A new patch is available for users who installed Internet Explorer 6 on Windows 2000 SP4 systems. https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/21692.tar.gz