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Category:   Application (E-mail Server)  >   Fetchmail Vendors:   fetchmail.berlios.de
Fetchmail Warning Message Forwarding Bug Lets Users Deny Service
SecurityTracker Alert ID:  1018627
SecurityTracker URL:  http://securitytracker.com/id/1018627
CVE Reference:   CVE-2007-4565   (Links to External Site)
Date:  Aug 30 2007
Impact:   Denial of service via local system, Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 6.3.9
Description:   A vulnerability was reported in Fetchmail. A local user can cause denial of service conditions.

If a fetchmail warning is generated and forwarded to the local mail service but the SMTP mail service refuses the message, a NULL pointer dereference may occur. As a result, the fetchmail process will crash.

A local user with the ability to affect SMTP service can prevent message delivery to cause fetchmail to crash.

In ceratain cases where fetchmail forwards to a network-based SMTP service, a remote user with the ability to affect SMTP service can prevent message delivery to cause fetchmail to crash.

The process must be restarted to return to normal operations.

Earl Chew discovered this vulnerability.

Impact:   A local user can cause denial of service conditions.

In certain cases, a remote user may be able to cause denial of service conditions.

Solution:   The vendor has issued a fixed version (6.3.9). A patch for 6.3.8 is also available.

The Fetchmail advisory is available at:

http://www.fetchmail.info/fetchmail-SA-2007-02.txt

Vendor URL:  www.fetchmail.info/fetchmail-SA-2007-02.txt (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.
Sep 8 2009 (Red Hat Issues Fix) Fetchmail Warning Message Forwarding Bug Lets Users Deny Service
Red Hat has released a fix for Red Hat Enterprise Linux 3, 4, and 5.



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