Postfix 'epoll' Linux Event Handler Local Denial of Service Vulnerability

BID:30977

Info

Postfix 'epoll' Linux Event Handler Local Denial of Service Vulnerability

Bugtraq ID: 30977
Class: Design Error
CVE: CVE-2008-3889
Remote: No
Local: Yes
Published: Sep 02 2008 12:00AM
Updated: Apr 13 2015 10:15PM
Credit: Wietse Venema
Vulnerable: Wietse Venema Postfix 2.5.4
Wietse Venema Postfix 2.4.8
Wietse Venema Postfix 2.6
Wietse Venema Postfix 2.5.4 Patchlevel 4
Ubuntu Ubuntu Linux 8.04 LTS sparc
Ubuntu Ubuntu Linux 8.04 LTS powerpc
Ubuntu Ubuntu Linux 8.04 LTS lpia
Ubuntu Ubuntu Linux 8.04 LTS i386
Ubuntu Ubuntu Linux 8.04 LTS amd64
Ubuntu Ubuntu Linux 7.10 sparc
Ubuntu Ubuntu Linux 7.10 powerpc
Ubuntu Ubuntu Linux 7.10 lpia
Ubuntu Ubuntu Linux 7.10 i386
Ubuntu Ubuntu Linux 7.10 amd64
Turbolinux Turbolinux Server 10.0
Turbolinux Turbolinux Server 11 x64
Turbolinux Turbolinux Server 11
Turbolinux Turbolinux Server 10.0.0 x64
Turbolinux Client 2008
Turbolinux Appliance Server 3.0 x64
Turbolinux Appliance Server 3.0
S.u.S.E. openSUSE 11.0
S.u.S.E. openSUSE 10.3
S.u.S.E. openSUSE 10.2
rPath rPath Linux 2
Pardus Linux 2008 0
Mandriva Linux Mandrake 2008.1 x86_64
Mandriva Linux Mandrake 2008.1
Mandriva Linux Mandrake 2008.0 x86_64
Mandriva Linux Mandrake 2008.0
Gentoo Linux
Not Vulnerable: Wietse Venema Postfix 2.5.5
Wietse Venema Postfix 2.4.9
Wietse Venema Postfix 2.6-20080902

Discussion

Postfix 'epoll' Linux Event Handler Local Denial of Service Vulnerability

Postfix is prone to a local denial-of-service vulnerability because of a file-descriptor leak that occurs when it executes non-Postfix commands.

Local attackers can exploit this issue to trigger automatic Postfix shutdowns, denying service to legitimate users.

This issue affects Postfix 2.4 and later for Linux kernel 2.6 platforms.

Exploit / POC

Postfix 'epoll' Linux Event Handler Local Denial of Service Vulnerability

The following proof-of-concept code is available:

Solution / Fix

Postfix 'epoll' Linux Event Handler Local Denial of Service Vulnerability

Solution:
The vendor has released updates. Please see the references for more information.


Mandriva Linux Mandrake 2008.1 x86_64

Mandriva Linux Mandrake 2008.1

Mandriva Linux Mandrake 2008.0 x86_64

Mandriva Linux Mandrake 2008.0

References

Postfix 'epoll' Linux Event Handler Local Denial of Service Vulnerability

References:
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