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Microsoft Security Bulletin MS01-027 : Flaws in Web Server Certificate Validation Could Enable Spoofing | |
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| Time: 21:08 EST/02:08 GMT | News Source: Microsoft TechNet Security | Posted By: Will1 | ||
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A patch is available to eliminate two newly discovered vulnerabilities affecting Internet Explorer 5.01 and 5.5, both of which could enable an attacker to spoof trusted web sites. The first vulnerability involves how digital certificates from web servers are validated. When CRL checking for such certificates is enabled, it could be possible for any or all of the following checks to no longer be performed:
The second vulnerability could enable a web page to display the URL from a different web site in the IE address bar. This spoofing could occur within a valid SSL session with the impersonated site. Both vulnerabilities could be used to convince a user that the attacker’s web site was actually a different one – one that the user presumably trusts and would provide sensitive information to. However, as discussed in the Mitigating Factors section below, there would be significant hurdles to exploiting either vulnerability. Download locations for this patch: http://www.microsoft.com/windows/ie/download/critical/q295106/default.asp | ||
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