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Category:   Application (E-mail Server)  >   Fetchmail Vendors:   fetchmail.berlios.de
Fetchmail NULL Character Flaw in Common Name Field Lets Remote Users Spoof Certficiates
SecurityTracker Alert ID:  1022679
SecurityTracker URL:  http://securitytracker.com/id/1022679
CVE Reference:   CVE-2009-2666   (Links to External Site)
Date:  Aug 7 2009
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.3.10 and prior versions
Description:   A vulnerability was reported in Fetchmail. A remote user can spoof certificates of arbitrary sites.

A remote user can create a certificate with a specially crafted Common Name field OR subjectAltName field that contains a NULL character. Once the certificate is signed by a Certificate Authority, the certificate can be used to spoof a target site's certificate.

Impact:   A remote user can spoof certificates of arbitrary sites.
Solution:   The vendor has issued a fix (6.3.11).

The vendor's advisory is available at:

http://fetchmail.berlios.de/fetchmail-SA-2009-01.txt

Vendor URL:  fetchmail.berlios.de/fetchmail-SA-2009-01.txt (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 8 2009 (Red Hat Issues Fix) Fetchmail NULL Character Flaw in Common Name Field Lets Remote Users Spoof Certficiates
Red Hat has released a fix for Red Hat Enterprise Linux 3, 4, and 5.



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