Linux Kernel up to 2.6.8 netfilter/iptables skb_checksum_help input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 2.6.8. This issue affects the function skb_checksum_help of the file netfilter/iptables of the component netfilter/iptables. The manipulation results in input validation. This vulnerability was named CVE-2005-0449. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 2.6.8 (Operating System). It has been classified as critical. Affected is the function skb_checksum_help of the file netfilter/iptables of the component netfilter/iptables. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

The netfilter/iptables module in Linux before 2.6.8.1 allows remote attackers to cause a denial of service (kernel crash) or bypass firewall rules via crafted packets, which are not properly handled by the skb_checksum_help function.

The issue has been introduced in 12/18/2003. The weakness was presented 05/02/2005 by Michael Kerrisk (Website). The advisory is shared for download at redhat.com. This vulnerability is traded as CVE-2005-0449 since 02/16/2005. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 491 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 21923 (CentOS 3 : kernel (CESA-2005:293)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 117975 (CentOS Security Update for Kernel (CESA-2005:283)).

Upgrading to version 2.6.8.1 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (17800), Tenable (21923), SecurityFocus (BID 12598†), OSVDB (13850†) and Secunia (SA11202†). See VDB-935, VDB-987, VDB-1080 and VDB-1233 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 21923
Nessus Name: CentOS 3 : kernel (CESA-2005:293)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 56469
OpenVAS Name: Debian Security Advisory DSA 1017-1 (kernel-source-2.6.8)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 2.6.8.1

Timelineinfo

12/18/2003 🔍
02/15/2005 +425 days 🔍
02/15/2005 +0 days 🔍
02/16/2005 +1 days 🔍
04/21/2005 +64 days 🔍
04/22/2005 +1 days 🔍
05/02/2005 +10 days 🔍
05/02/2005 +0 days 🔍
07/05/2006 +429 days 🔍
03/10/2015 +3170 days 🔍
06/06/2019 +1549 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: redhat.com
Researcher: Michael Kerrisk
Status: Not defined

CVE: CVE-2005-0449 (🔍)
GCVE (CVE): GCVE-0-2005-0449
GCVE (VulDB): GCVE-100-24468

OVAL: 🔍

X-Force: 17800
SecurityFocus: 12598 - Linux Kernel Multiple Vulnerabilities
Secunia: 11202
OSVDB: 13850 - Linux IPTables/Netfilter Module Crafted Packet Bypass
Vulnerability Center: 7653 - DoS in Linux Kernel <2.6.8 Netfilter/IPtables Module via Crafted Packets, Medium

See also: 🔍

Entryinfo

Created: 03/10/2015 23:05
Updated: 06/06/2019 09:10
Changes: 03/10/2015 23:05 (80), 06/06/2019 09:10 (4)
Complete: 🔍
Cache ID: 216:005:103