Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability

BID:4188

Info

Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability

Bugtraq ID: 4188
Class: Design Error
CVE:
Remote: Yes
Local: No
Published: Feb 27 2002 12:00AM
Updated: Feb 27 2002 12:00AM
Credit: This vulnerability was announced by Harald Welte <[email protected]> on February 27th, 2002.
Vulnerable: Linux kernel 2.4.18 pre-7
Linux kernel 2.4.18 pre-6
Linux kernel 2.4.18 pre-5
Linux kernel 2.4.18 pre-4
Linux kernel 2.4.18 pre-3
Linux kernel 2.4.18 pre-2
Linux kernel 2.4.18 pre-1
Linux kernel 2.4.17
Linux kernel 2.4.16
+ Sun Cobalt RaQ 550
Linux kernel 2.4.15
Linux kernel 2.4.14
Linux kernel 2.4.9
+ Redhat Enterprise Linux AS 2.1 IA64
 + Redhat Enterprise Linux AS 2.1
 + Redhat Enterprise Linux ES 2.1 IA64
 + Redhat Enterprise Linux ES 2.1
 + Redhat Enterprise Linux WS 2.1 IA64
 + Redhat Enterprise Linux WS 2.1
 + Redhat Linux 7.2 ia64
 + Redhat Linux 7.2 i386
 + Redhat Linux 7.2 alpha
 + Redhat Linux 7.1 ia64
 + Redhat Linux 7.1 i386
 + Redhat Linux 7.1 alpha
 + Sun Linux 5.0.5
+ Sun Linux 5.0.3
+ Sun Linux 5.0
Linux kernel 2.4.8
+ Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0
Not Vulnerable: Linux kernel 2.4.18 pre-8
Linux kernel 2.4.18
+ Astaro Security Linux 2.0 23
 + Astaro Security Linux 2.0 16
 + 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
 + Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0
+ Redhat Advanced Workstation for the Itanium Processor 2.1 IA64
 + Redhat Advanced Workstation for the Itanium Processor 2.1
+ Redhat Enterprise Linux AS 2.1 IA64
 + Redhat Linux 8.0
+ Redhat Linux 7.3
+ S.u.S.E. Linux Connectivity Server
+ S.u.S.E. Linux Database Server 0
 + S.u.S.E. Linux Firewall on CD
+ S.u.S.E. Linux Office Server
+ S.u.S.E. Linux Personal 8.2
+ S.u.S.E. SuSE eMail Server 3.1
+ S.u.S.E. SuSE eMail Server III
+ SuSE Linux 8.1
+ SuSE Linux 8.0
+ SuSE Linux 7.3
+ SuSE Linux 7.2
+ SuSE Linux 7.1
+ SuSE Linux Openexchange Server
+ SuSE SUSE Linux Enterprise Server 8
 + SuSE SUSE Linux Enterprise Server 7
 + Turbolinux Turbolinux Server 8.0
+ Turbolinux Turbolinux Server 7.0
+ Turbolinux Turbolinux Workstation 8.0
+ Turbolinux Turbolinux Workstation 7.0

Discussion

Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability

The Linux kernel is a freely available, open source kernel originally written by Linus Torvalds. It is community maintained, and freely distributed for use with Linux systems.

The netfilter connection tracking code in the Linux kernel does not properly handle DCC chats. When a DCC chat is initiated, the expected behavior of the firewall is to listen on a range of ports for a connection request from a specific IP address. When the connection from the specific IP is made, the DCC chat is initiated. However, the code included in the affected kernels does not properly restrict access, listening on a range of ports for a connection from any IP address.

Exploit / POC

Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability

No exploit is required for this vulnerability.

Solution / Fix

Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability

Solution:
Mandrake has released kernel upgrades that address this issue. MandrakeUpdate should not be used to apply these kernel upgrades, see the attached advisory for further details.

Fixes available:


Linux kernel 2.4.14

Linux kernel 2.4.15

Linux kernel 2.4.16

Linux kernel 2.4.17

Linux kernel 2.4.18 pre-3

Linux kernel 2.4.18 pre-2

Linux kernel 2.4.18 pre-4

Linux kernel 2.4.18 pre-6

Linux kernel 2.4.18 pre-1

Linux kernel 2.4.18 pre-5

Linux kernel 2.4.18 pre-7

Linux kernel 2.4.8

Linux kernel 2.4.9

References

Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability

References:

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