Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability

BID:18345

CVE-2006-2659 |

Info

Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability

Bugtraq ID: 18345
Class: Failure to Handle Exceptional Conditions
CVE: CVE-2006-2659
Remote: Yes
Local: No
Published: Jun 09 2006 12:00AM
Updated: Nov 16 2006 10:11PM
Credit: This issue was announced by the vendor.
Vulnerable: Ubuntu Ubuntu Linux 5.10 powerpc
Ubuntu Ubuntu Linux 5.10 i386
Ubuntu Ubuntu Linux 5.10 amd64
Ubuntu Ubuntu Linux 5.0 4 powerpc
Ubuntu Ubuntu Linux 5.0 4 i386
Ubuntu Ubuntu Linux 5.0 4 amd64
Ubuntu Ubuntu Linux 6.06 LTS powerpc
Ubuntu Ubuntu Linux 6.06 LTS i386
Ubuntu Ubuntu Linux 6.06 LTS amd64
Gentoo Linux
Double Precision Incorporated Courier MTA 0.47
Double Precision Incorporated Courier MTA 0.45.1
Double Precision Incorporated Courier MTA 0.45
Double Precision Incorporated Courier MTA 0.44.2
Double Precision Incorporated Courier MTA 0.44
Double Precision Incorporated Courier MTA 0.43.2
Double Precision Incorporated Courier MTA 0.43.1
Double Precision Incorporated Courier MTA 0.43
Double Precision Incorporated Courier MTA 0.42.2
Double Precision Incorporated Courier MTA 0.40.1
Double Precision Incorporated Courier MTA 0.40
Double Precision Incorporated Courier MTA 0.38.1
- FreeBSD FreeBSD 4.5
- FreeBSD FreeBSD 4.4
- FreeBSD FreeBSD 4.3
- FreeBSD FreeBSD 4.2
- IBM AIX 4.3.3
- IBM AIX 4.3.2
- IBM AIX 4.3.1
- IBM AIX 4.3
- IBM AIX 5.1
 - Mandriva Linux Mandrake 8.2
- Mandriva Linux Mandrake 8.1 ia64
 - Mandriva Linux Mandrake 8.1
- Mandriva Linux Mandrake 8.0 ppc
 - Mandriva Linux Mandrake 8.0
- Mandriva Linux Mandrake 7.2
- NetBSD NetBSD 1.5.2
- NetBSD NetBSD 1.5.1
- NetBSD NetBSD 1.5
- OpenBSD OpenBSD 2.9
- OpenBSD OpenBSD 2.8
- OpenBSD OpenBSD 2.7
- OpenBSD OpenBSD 2.6
- OpenBSD OpenBSD 3.1
 - OpenBSD OpenBSD 3.0
 - Redhat Linux 7.3 i386
 - Redhat Linux 7.2 ia64
 - Redhat Linux 7.2 i386
 - Redhat Linux 7.1 ia64
 - Redhat Linux 7.1 i386
 - Redhat Linux 7.1 alpha
 - Redhat Linux 7.0 sparc
 - Redhat Linux 7.0 i386
 - Redhat Linux 7.0 alpha
 - Sun Solaris 8_x86
 - Sun Solaris 8_sparc
 - Sun Solaris 7.0_x86
 - Sun Solaris 7.0
 - Sun Solaris 2.6_x86
 - Sun Solaris 2.6
 - SuSE Linux 8.0 i386
 - SuSE Linux 7.3 sparc
 - SuSE Linux 7.3 ppc
 - SuSE Linux 7.3 i386
 - SuSE Linux 7.2 i386
 - SuSE Linux 7.1 x86
 - SuSE Linux 7.1 sparc
 - SuSE Linux 7.1 ppc
 - SuSE Linux 7.1 alpha
 - SuSE Linux 7.0 sparc
 - SuSE Linux 7.0 ppc
 - SuSE Linux 7.0 i386
 - SuSE Linux 7.0 alpha
 Double Precision Incorporated Courier MTA 0.37.3
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 Double Precision Incorporated Courier Mail Server 0.53.1
Double Precision Incorporated Courier Mail Server 0.53
Double Precision Incorporated Courier Mail Server 0.50.1
Double Precision Incorporated Courier Mail Server 0.50
Double Precision Incorporated Courier Mail Server 0.47
+ Ubuntu Ubuntu Linux 5.0 4 powerpc
 + Ubuntu Ubuntu Linux 5.0 4 i386
 + Ubuntu Ubuntu Linux 5.0 4 amd64
 Debian Linux 3.1 sparc
Debian Linux 3.1 s/390
Debian Linux 3.1 ppc
Debian Linux 3.1 mipsel
Debian Linux 3.1 mips
Debian Linux 3.1 m68k
Debian Linux 3.1 ia-64
Debian Linux 3.1 ia-32
Debian Linux 3.1 hppa
Debian Linux 3.1 arm
Debian Linux 3.1 amd64
Debian Linux 3.1 alpha
Debian Linux 3.1
Courier Mail Server Courier Imap 3.0.8
Not Vulnerable: Double Precision Incorporated Courier Mail Server 0.53.2

Discussion

Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability

Courier Mail Server is prone to a remote denial-of-service vulnerability because it fails to properly handle certain usernames in email messages.

A remote attacker may exploit this issue to consume excessive CPU resources, potentially denying service to legitimate users.

Versions of the Courier MTA prior to 0.53.2 are vulnerable to this issue.

Exploit / POC

Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability

Attackers use standard email clients to exploit this issue.

Solution / Fix

Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability

Solution:
The vendor has released an update to address this issue.

Please see the referenced vendor advisories for more information on obtaining and applying fixes.


Double Precision Incorporated Courier MTA 0.37.3

Double Precision Incorporated Courier MTA 0.38.1

Double Precision Incorporated Courier MTA 0.40

Double Precision Incorporated Courier MTA 0.40.1

Double Precision Incorporated Courier MTA 0.42.2

Double Precision Incorporated Courier MTA 0.43

Double Precision Incorporated Courier MTA 0.43.1

Double Precision Incorporated Courier MTA 0.43.2

Double Precision Incorporated Courier MTA 0.44

Double Precision Incorporated Courier MTA 0.44.2

Double Precision Incorporated Courier MTA 0.45

Double Precision Incorporated Courier MTA 0.45.1

Double Precision Incorporated Courier MTA 0.47

Double Precision Incorporated Courier Mail Server 0.47

Double Precision Incorporated Courier Mail Server 0.50

Double Precision Incorporated Courier Mail Server 0.50.1

Double Precision Incorporated Courier Mail Server 0.53

Double Precision Incorporated Courier Mail Server 0.53.1

Courier Mail Server Courier Imap 3.0.8

References

Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability

References:
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