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Category:   Application (E-mail Server)  >   Courier Mail Server Vendors:   Double Precision, Inc.
Courier Mailing List Manager Lets Remote Users Deny Service
SecurityTracker Alert ID:  1016248
SecurityTracker URL:
CVE Reference:   CVE-2006-2659   (Links to External Site)
Date:  Jun 8 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 0.53.2
Description:   A vulnerability was reported in Courier in the Mailing List Manager. A remote user can cause denial of service conditions.

A remote user can subscribe to a mailing list with an e-mail address with a username that contains an equal character ('='). When the mailing list attempts to send mail to the list, the courieresmtp process will consume all available CPU resources. The courierlocal process will eventually terminate.

The flaw resides in 'courier/libs/comverp.c'.

Impact:   A remote user can cause denial of service conditions.
Solution:   the vendor has issued a fixed version (0.53.2), available at:

A patch is also available at:

Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

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