GLSA-200407-12 : Linux Kernel: Remote DoS vulnerability with IPTables TCP Handling

medium Nessus Plugin ID 14545

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-200407-12 (Linux Kernel: Remote DoS vulnerability with IPTables TCP Handling)

An attacker can utilize an erroneous data type in the IPTables TCP option handling code, which lies in an iterator. By making a TCP packet with a header length larger than 127 bytes, a negative integer would be implied in the iterator.
Impact :

By sending one malformed packet, the kernel could get stuck in a loop, consuming all of the CPU resources and rendering the machine useless, causing a Denial of Service. This vulnerability requires no local access.
Workaround :

If users do not use the netfilter functionality or do not use any ``--tcp-option'' rules they are not vulnerable to this exploit. Users that are may remove netfilter support from their kernel or may remove any ``--tcp-option'' rules they might be using. However, all users are urged to upgrade their kernels to patched versions.

Solution

Users are encouraged to upgrade to the latest available sources for their system:
# emerge sync # emerge -pv your-favorite-sources # emerge your-favorite-sources # # Follow usual procedure for compiling and installing a kernel.
# # If you use genkernel, run genkernel as you would do normally.

Plugin Details

Severity: Medium

ID: 14545

File Name: gentoo_GLSA-200407-12.nasl

Version: 1.18

Type: local

Family: Gentoo Local Security Checks

Published: 8/30/2004

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:aa-sources, p-cpe:/a:gentoo:linux:ck-sources, p-cpe:/a:gentoo:linux:development-sources, p-cpe:/a:gentoo:linux:gentoo-dev-sources, p-cpe:/a:gentoo:linux:hardened-dev-sources, p-cpe:/a:gentoo:linux:hppa-dev-sources, p-cpe:/a:gentoo:linux:mips-sources, p-cpe:/a:gentoo:linux:mm-sources, p-cpe:/a:gentoo:linux:pegasos-dev-sources, p-cpe:/a:gentoo:linux:rsbac-dev-sources, p-cpe:/a:gentoo:linux:uclinux-sources, p-cpe:/a:gentoo:linux:usermode-sources, p-cpe:/a:gentoo:linux:win4lin-sources, p-cpe:/a:gentoo:linux:xbox-sources, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 7/14/2004

Vulnerability Publication Date: 6/30/2004

Reference Information

CVE: CVE-2004-0626

GLSA: 200407-12

Detections

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