|
IPTables/Netfilter Denial of Service Vulnerabilities
|
|
Secunia Advisory:
|
SA9429
|
|
|
Release Date:
|
2003-08-04
|
|
Popularity:
|
11,369 views
|
|
|
Critical:
|
Moderately critical
|
|
Impact:
|
DoS
|
|
Where:
|
From remote
|
|
Solution Status:
|
Vendor Patch
|
|
| OS: | Linux Kernel 2.4.x
Linux Kernel 2.5.x
|
|
|
Subscribe:
|
Instant alerts on relevant vulnerabilities 
|
|
| CVE reference: | CVE-2003-0187
CVE-2003-0467
|
|
Description:
Two vulnerabilities have been identified in IPTables/Netfilter, which can be exploited by malicious people to cause a DoS (Denial of Service) on a vulnerable system.
The first vulnerability is caused due to an error when the system performs NAT (Network Address Translation). Reportedly, this can in some circumstances be exploited to cause the system to crash if the modules "ip_nat_ftp" or "ip_nat_irc" has been loaded, or "CONFIG_IP_NF_NAT_FTP" or "CONFIG_IP_NF_NAT_IRC" is enabled.
The vulnerability affects version 2.4.20 of the Linux kernel and recent 2.5 kernels.
The second vulnerability is caused due to an error in the Connection Tracking when handling "UNCONFIRMED" connections. Reportedly, this can be exploited to cause the system to crash if the "ip_conntrack" module is loaded or "CONFIG_IP_NF_CONNTRACK" is enabled.
This vulnerability only affects version 2.4.20 of the Linux kernel.
Solution:
Update to kernel version 2.4.21:
http://www.kernel.org/
Development kernels should not be used in production environments.
Provided and/or discovered by:
Netfilter Core Team
Original Advisory:
http://www.netfilter.org/security/2003-08-01-nat-sack.html
http://www.netfilter.org/security/2003-08-01-listadd.html
|
|
|
Track this Secunia Advisory
|
Customers of the Secunia Vulnerability Intelligence solutions will automatically receive updates when new information regarding this advisory is released.
Read more about our Vulnerability Intelligence solutions and what they can do for you and your company.
|
|
|
About this Secunia Advisory
|
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
|
