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Category:   Application (E-mail Server)  >   Sendmail Vendors:   Sendmail Consortium
Sendmail May Crash When Processing Mail with a Long Header
SecurityTracker Alert ID:  1016753
SecurityTracker URL:  http://securitytracker.com/id/1016753
CVE Reference:   CVE-2006-4434   (Links to External Site)
Updated:  Oct 11 2006
Original Entry Date:  Aug 25 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.13.7 and prior versions
Description:   A vulnerability was reported in Sendmail. A remote user can cause denial of service conditions.

A remote user can send e-mail with specially crafted (and very long) header lines to trigger a "use-after-free" flaw and cause the target sendmail service to crash.

Moritz Jodeit reported this vulnerability.

[Editor's note: The vendor reported on August 9, 2006 that a potential "crash" had been corrected, but the vendor did not describe the nature of the crash. OpenBSD reported the security relevant nature of the crash on August 25, 2006.]

Impact:   A remote user can cause sendmail to crash.
Solution:   The vendor issued a fixed version (8.13.8) on August 9, 2006, available at:

http://www.sendmail.org/releases/8.13.8.html

Vendor URL:  www.sendmail.org/releases/8.13.8.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 25 2006 (OpenBSD Issues Fix) Sendmail May Crash When Processing Mail with a Long Header
OpenBSD has issued a fix for OpenBSD 3.8 and 3.9.
Oct 11 2006 (Sun Describes Workaround ) Sendmail May Crash When Processing Mail with a Long Header
Sun has described a workaround for Solaris 9 and 10.
Nov 17 2008 (IBM Issues Fix for AIX) Sendmail May Crash When Processing Mail with a Long Header
IBM has issued a fix for AIX 6.2.



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