Description
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.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Microsoft Internet Explorer 5/6 / Konqueror 2.2.2/3.0 / Weblogic Server 5/6/7 - Invalid X.509 Certificate Chain EDB-21692 · remote · Aug 6, 2002 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- oval:org.mitre.oval:def:1332 vdb-entry signature
- 20020812 IE SSL Exploit mailing-list
- oval:org.mitre.oval:def:1056 vdb-entry signature
- 20020805 IE SSL Vulnerability mailing-list
- ssl-ca-certificate-spoofing(9776) vdb-entry
- 20020819 Insufficient Verification of Client Certificates in IIS 5.0 pre sp3 mailing-list
- oval:org.mitre.oval:def:2671 vdb-entry signature
- MS02-050 vendor-advisory