5 - VU#232881

Executive Summary

Summary
Title	Squid remote denial-of-service vulnerability

Informations
Name	VU#232881	First vendor Publication	2007-12-10
Vendor	VU-CERT	Last vendor Modification	2008-01-18
Severity (Vendor)	N/A	Revision	M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Cvss Base Score	5	Attack Range	Network
Cvss Impact Score	2.9	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Vulnerability Note VU#232881

Squid remote denial-of-service vulnerability

Overview

The Squid Proxy server contains a vulnerability that may allow an attacker to create a denial-of-service condition that affects the Squid server and systems that rely on it.

I. Description

Squid Proxy Cache is a caching proxy that supports the HTTP, HTTPS, and FTP protocols. Squid can also be deployed as a reverse proxy.

From Squid Proxy Cache Security Update Advisory SQUID-2007:2

Due to incorrect bounds checking Squid is vulnerable to a denial of service check during some cache update reply processing.

This incorrect bounds checking occurs within the httpHeaderUpdate() function when processing cache update replies.

II. Impact

An attacker who can access the Squid proxy may be able to cause the proxy server to crash. If the Squid proxy is deployed as a reverse proxy, the web servers relying on the proxy may also be affected.

III. Solution

Update

The Squid team has released patches 11780 and 11211 to address this issue. Administrators who obtain Squid from their operating system vendor should see the systems affected portion of this document for a partial list of affected vendors.

Restrict access

Restricting access to the Squid proxy via access control lists or firewall rules may prevent this vulnerability from being exploited by remote attackers..

Systems Affected

Vendor	Status	Date Updated
Apple Computer, Inc.	Not Vulnerable	11-Dec-2007
Conectiva Inc.	Unknown	10-Dec-2007
Cray Inc.	Unknown	10-Dec-2007
Debian GNU/Linux	Unknown	10-Dec-2007
EMC Corporation	Unknown	10-Dec-2007
Engarde Secure Linux	Unknown	10-Dec-2007
F5 Networks, Inc.	Unknown	10-Dec-2007
Fedora Project	Unknown	10-Dec-2007
FreeBSD, Inc.	Unknown	10-Dec-2007
Fujitsu	Unknown	10-Dec-2007
Gentoo Linux	Unknown	10-Dec-2007
Hewlett-Packard Company	Unknown	10-Dec-2007
Hitachi	Unknown	10-Dec-2007
IBM Corporation	Unknown	10-Dec-2007
IBM Corporation (zseries)	Unknown	10-Dec-2007
IBM eServer	Unknown	10-Dec-2007
Ingrian Networks, Inc.	Unknown	10-Dec-2007
IPCop	Vulnerable	11-Dec-2007
Juniper Networks, Inc.	Unknown	10-Dec-2007
Mandriva, Inc.	Unknown	10-Dec-2007
Microsoft Corporation	Not Vulnerable	11-Dec-2007
MontaVista Software, Inc.	Unknown	10-Dec-2007
NEC Corporation	Unknown	10-Dec-2007
NetBSD	Not Vulnerable	11-Dec-2007
Nokia	Unknown	10-Dec-2007
Novell, Inc.	Unknown	10-Dec-2007
OpenBSD	Unknown	10-Dec-2007
Openwall GNU/*/Linux	Not Vulnerable	11-Dec-2007
QNX, Software Systems, Inc.	Unknown	10-Dec-2007
Red Hat, Inc.	Vulnerable	11-Dec-2007
Silicon Graphics, Inc.	Unknown	10-Dec-2007
Slackware Linux Inc.	Not Vulnerable	10-Dec-2007
SmoothWall	Unknown	10-Dec-2007
Sony Corporation	Unknown	10-Dec-2007
Squid	Vulnerable	10-Dec-2007
Sun Microsystems, Inc.	Unknown	10-Dec-2007
SUSE Linux	Vulnerable	18-Jan-2008
The SCO Group	Unknown	10-Dec-2007
Trustix Secure Linux	Unknown	10-Dec-2007
Turbolinux	Unknown	10-Dec-2007
Ubuntu	Unknown	10-Dec-2007
Unisys	Unknown	10-Dec-2007
Wind River Systems, Inc.	Unknown	10-Dec-2007

References

http://www.squid-cache.org/Advisories/SQUID-2007_2.txt
http://wiki.squid-cache.org/SquidFaq/ReverseProxy
http://wiki.squid-cache.org/SquidFaq/SquidAcl#head-c87419712cac704d01cecc7da11cd02f489b6986
http://secunia.com/advisories/27910/

Credit

The Squid proxy team credits the Wikimedia Foundation for discovering this vulnerability. Adrian Chadd and Henrik Nordstrom are credited for authoring patches that address the issue.

This document was written by Ryan Giobbi.

Other Information

Date Public	11/27/2007
Date First Published	12/10/2007 02:11:34 PM
Date Last Updated	01/18/2008
CERT Advisory
CVE Name	CVE-2007-6239
Metric	7.51
Document Revision	12

Original Source

Url : http://www.kb.cert.org/vuls/id/232881

CWE : Common Weakness Enumeration

%	Id	Name
100 %	CWE-20	Improper Input Validation

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:10915

Oval ID:	oval:org.mitre.oval:def:10915
Title:	The "cache update reply processing" functionality in Squid 2.x before 2.6.STABLE17 and Squid 3.0 allows remote attackers to cause a denial of service (crash) via unknown vectors related to HTTP headers and an Array memory leak during requests for cached objects.
Description:	The "cache update reply processing" functionality in Squid 2.x before 2.6.STABLE17 and Squid 3.0 allows remote attackers to cause a denial of service (crash) via unknown vectors related to HTTP headers and an Array memory leak during requests for cached objects.
Family:	unix	Class:	vulnerability
Reference(s):	CVE-2007-6239	Version:	5
Platform(s):	Red Hat Enterprise Linux 3 CentOS Linux 3 Red Hat Enterprise Linux 4 CentOS Linux 4 Oracle Linux 4 Red Hat Enterprise Linux 5 CentOS Linux 5 Oracle Linux 5	Product(s):
Definition Synopsis:
OS Section: RHEL3, CentOS3 RHEL3 or CentOS3 The operating system installed on the system is Red Hat Enterprise Linux 3 AND CentOS Linux 3.x AND squid is earlier than 7:2.5.STABLE3-8.3E OR OS Section: RHEL4, CentOS4, Oracle Linux 4 RHEL4, CentOS4 or Oracle Linux 4 The operating system installed on the system is Red Hat Enterprise Linux 4 AND CentOS Linux 4.x AND Oracle Linux 4.x AND squid is earlier than 7:2.5.STABLE14-1.4E.el4_6.1 OR OS Section: RHEL5, CentOS5, Oracle Linux 5 RHEL5, CentOS5 or Oracle Linux 5 The operating system installed on the system is Red Hat Enterprise Linux 5 AND CentOS Linux 5.x AND Oracle Linux 5.x AND squid is earlier than 7:2.6.STABLE6-5.el5_1.2

Definition Id: oval:org.mitre.oval:def:17749

Oval ID:	oval:org.mitre.oval:def:17749
Title:	USN-565-1 -- squid vulnerability
Description:	It was discovered that Squid did not always clean up cache memory correctly.
Family:	unix	Class:	patch
Reference(s):	USN-565-1 CVE-2007-6239	Version:	7
Platform(s):	Ubuntu 6.06 Ubuntu 6.10 Ubuntu 7.04 Ubuntu 7.10	Product(s):	squid
Definition Synopsis:
Release section Ubuntu 6.06 is installed AND squid DPKG is earlier than 2.5.12-4ubuntu2.3 AND Release section Ubuntu 6.10 is installed AND squid DPKG is earlier than 2.6.1-3ubuntu1.5 AND Release section Ubuntu 7.04 is installed AND squid DPKG is earlier than 2.6.5-4ubuntu2.1 AND Release section Ubuntu 7.10 is installed AND squid DPKG is earlier than 2.6.14-1ubuntu2.1

Definition Id: oval:org.mitre.oval:def:18736

Oval ID:	oval:org.mitre.oval:def:18736
Title:	DSA-1646-2 squid - array bounds check
Description:	A weakness has been discovered in squid, a caching proxy server. The flaw was introduced upstream in response to <a href="http://security-tracker.debian.org/tracker/CVE-2007-6239">CVE-2007-6239</a>, and announced by Debian in <a href="dsa-1482">DSA-1482-1</a>. The flaw involves an over-aggressive bounds check on an array resize, and could be exploited by an authorised client to induce a denial of service condition against squid.
Family:	unix	Class:	patch
Reference(s):	DSA-1646-2 CVE-2008-1612 CVE-2007-6239	Version:	7
Platform(s):	Debian GNU/Linux 4.0	Product(s):	squid
Definition Synopsis:
Debian GNU/Linux 4.0 is installed. AND squid DPKG is earlier than 2.6.5-6etch4

Definition Id: oval:org.mitre.oval:def:19956

Oval ID:	oval:org.mitre.oval:def:19956
Title:	DSA-1482-1 squid - programming error
Description:	It was discovered that malformed cache update replies against the Squid WWW proxy cache could lead to the exhaustion of system memory, resulting in potential denial of service.
Family:	unix	Class:	patch
Reference(s):	DSA-1482-1 CVE-2007-6239	Version:	5
Platform(s):	Debian GNU/Linux 4.0	Product(s):	squid
Definition Synopsis:
Debian GNU/Linux 4.0 is installed. AND squid DPKG is earlier than 0:2.6.5-6etch1

Definition Id: oval:org.mitre.oval:def:21708

Oval ID:	oval:org.mitre.oval:def:21708
Title:	ELSA-2007:1130: squid security update (Moderate)
Description:	The "cache update reply processing" functionality in Squid 2.x before 2.6.STABLE17 and Squid 3.0 allows remote attackers to cause a denial of service (crash) via unknown vectors related to HTTP headers and an Array memory leak during requests for cached objects.
Family:	unix	Class:	patch
Reference(s):	ELSA-2007:1130-01 CVE-2007-6239	Version:	6
Platform(s):	Oracle Linux 5	Product(s):	squid
Definition Synopsis:
Oracle Linux 5.x AND squid is earlier than 7:2.6.STABLE6-5.el5_1.2

Definition Id: oval:org.mitre.oval:def:7232

Oval ID:	oval:org.mitre.oval:def:7232
Title:	DSA-1646 squid -- array bounds check
Description:	A weakness has been discovered in squid, a caching proxy server. The flaw was introduced upstream in response to CVE-2007-6239, and announced by Debian in DSA-1482-1. The flaw involves an over-aggressive bounds check on an array resize, and could be exploited by an authorised client to induce a denial of service condition against squid.
Family:	unix	Class:	patch
Reference(s):	DSA-1646 CVE-2008-1612 CVE-2007-6239	Version:	3
Platform(s):	Debian GNU/Linux 4.0	Product(s):	squid
Definition Synopsis:
Debian GNU/Linux 4.0 is installed. Architecture section Architecture independent section Installed architecture is all AND squid-common is earlier than 2.6.5-6etch2 AND squidclient is earlier than 2.6.5-6etch2 AND squid is earlier than 2.6.5-6etch2 AND squid-cgi is earlier than 2.6.5-6etch2

Definition Id: oval:org.mitre.oval:def:7991

Oval ID:	oval:org.mitre.oval:def:7991
Title:	DSA-1482 squid -- programming error
Description:	It was discovered that malformed cache update replies against the Squid WWW proxy cache could lead to the exhaustion of system memory, resulting in potential denial of service.
Family:	unix	Class:	patch
Reference(s):	DSA-1482 CVE-2007-6239	Version:	3
Platform(s):	Debian GNU/Linux 4.0	Product(s):	squid
Definition Synopsis:
Debian GNU/Linux 4.0 is installed. Architecture section Architecture independent section Installed architecture is all AND squid-common is earlier than 2.6.5-6etch1 AND squidclient is earlier than 2.6.5-6etch1 AND squid is earlier than 2.6.5-6etch1 AND squid-cgi is earlier than 2.6.5-6etch1

CPE : Common Platform Enumeration

Type	Description	Count
Application	Squid Squid Web Proxy Cache cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre3:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre2:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre1:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:3.0:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable7:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable6:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable5:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable4:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable3:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable2:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable16:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable15:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable14:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable13:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable12:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6.stable1:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.6:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5.stable14:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5.stable13:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5.stable12:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5.stable11:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable8:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable7:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable6:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable5:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable4:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable3:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable10:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_stable1:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.5_.stable9:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.4_stable7:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.4_stable6:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.4_stable4:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.4_stable2:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.3.stable5:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.3.stable4:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.1_patch2:::::::* cpe:2.3:a:squid:squid_web_proxy_cache:2.0_patch2:::::::*	38

OpenVAS Exploits

Date	Description
2009-10-13	Name : SLES10: Security update for squid File : nvt/sles10_squid0.nasl
2009-10-10	Name : SLES9: Security update for squid File : nvt/sles9p5015636.nasl
2009-04-09	Name : Mandriva Update for squid MDVSA-2008:134 (squid) File : nvt/gb_mandriva_MDVSA_2008_134.nasl
2009-04-09	Name : Mandriva Update for squid MDVSA-2008:002 (squid) File : nvt/gb_mandriva_MDVSA_2008_002.nasl
2009-03-31	Name : Gentoo Security Advisory GLSA 200903-38 (Squid) File : nvt/glsa_200903_38.nasl
2009-03-23	Name : Ubuntu Update for squid vulnerability USN-601-1 File : nvt/gb_ubuntu_USN_601_1.nasl
2009-03-23	Name : Ubuntu Update for squid vulnerability USN-565-1 File : nvt/gb_ubuntu_USN_565_1.nasl
2009-03-06	Name : RedHat Update for squid RHSA-2008:0214-01 File : nvt/gb_RHSA-2008_0214-01_squid.nasl
2009-03-06	Name : RedHat Update for squid RHSA-2007:1130-01 File : nvt/gb_RHSA-2007_1130-01_squid.nasl
2009-02-27	Name : CentOS Update for squid CESA-2008:0214 centos4 x86_64 File : nvt/gb_CESA-2008_0214_squid_centos4_x86_64.nasl
2009-02-27	Name : Fedora Update for squid FEDORA-2007-4170 File : nvt/gb_fedora_2007_4170_squid_fc8.nasl
2009-02-27	Name : Fedora Update for squid FEDORA-2007-4161 File : nvt/gb_fedora_2007_4161_squid_fc7.nasl
2009-02-27	Name : CentOS Update for squid CESA-2008:0214 centos4 i386 File : nvt/gb_CESA-2008_0214_squid_centos4_i386.nasl
2009-02-27	Name : CentOS Update for squid CESA-2008:0214 centos3 x86_64 File : nvt/gb_CESA-2008_0214_squid_centos3_x86_64.nasl
2009-02-27	Name : CentOS Update for squid CESA-2008:0214 centos3 i386 File : nvt/gb_CESA-2008_0214_squid_centos3_i386.nasl
2009-02-27	Name : CentOS Update for squid CESA-2008:0214-01 centos2 i386 File : nvt/gb_CESA-2008_0214-01_squid_centos2_i386.nasl
2009-02-27	Name : CentOS Update for squid CESA-2007:1130 centos4 x86_64 File : nvt/gb_CESA-2007_1130_squid_centos4_x86_64.nasl
2009-02-27	Name : CentOS Update for squid CESA-2007:1130 centos4 i386 File : nvt/gb_CESA-2007_1130_squid_centos4_i386.nasl
2009-02-27	Name : CentOS Update for squid CESA-2007:1130 centos3 x86_64 File : nvt/gb_CESA-2007_1130_squid_centos3_x86_64.nasl
2009-02-27	Name : CentOS Update for squid CESA-2007:1130 centos3 i386 File : nvt/gb_CESA-2007_1130_squid_centos3_i386.nasl
2009-02-27	Name : CentOS Update for squid CESA-2007:1130-04 centos2 i386 File : nvt/gb_CESA-2007_1130-04_squid_centos2_i386.nasl
2008-11-01	Name : Debian Security Advisory DSA 1646-2 (squid) File : nvt/deb_1646_2.nasl
2008-09-24	Name : Gentoo Security Advisory GLSA 200801-05 (squid) File : nvt/glsa_200801_05.nasl
2008-09-04	Name : FreeBSD Ports: squid File : nvt/freebsd_squid21.nasl
2008-02-15	Name : Debian Security Advisory DSA 1482-1 (squid) File : nvt/deb_1482_1.nasl

Open Source Vulnerability Database (OSVDB)

Id	Description
39381	Squid Cache Update Reply Processing Remote DoS

Snort® IPS/IDS

Date	Description
2014-01-10	Multiple Products excessive HTTP 304 Not Modified responses exploit attempt RuleID : 16008 - Revision : 18 - Type : OS-WINDOWS

Nessus® Vulnerability Scanner

Date	Description
2013-07-12	Name : The remote Oracle Linux host is missing a security update. File : oraclelinux_ELSA-2008-0214.nasl - Type : ACT_GATHER_INFO
2013-07-12	Name : The remote Oracle Linux host is missing a security update. File : oraclelinux_ELSA-2007-1130.nasl - Type : ACT_GATHER_INFO
2012-08-01	Name : The remote Scientific Linux host is missing a security update. File : sl_20071218_squid_on_SL5_x.nasl - Type : ACT_GATHER_INFO
2009-09-24	Name : The remote SuSE 9 host is missing a security-related patch. File : suse9_12004.nasl - Type : ACT_GATHER_INFO
2009-04-23	Name : The remote Mandriva Linux host is missing one or more security updates. File : mandriva_MDVSA-2008-134.nasl - Type : ACT_GATHER_INFO
2009-04-23	Name : The remote Mandriva Linux host is missing one or more security updates. File : mandriva_MDVSA-2008-002.nasl - Type : ACT_GATHER_INFO
2009-03-25	Name : The remote Gentoo host is missing one or more security-related patches. File : gentoo_GLSA-200903-38.nasl - Type : ACT_GATHER_INFO
2008-10-07	Name : The remote Debian host is missing a security-related update. File : debian_DSA-1646.nasl - Type : ACT_GATHER_INFO
2008-04-17	Name : The remote Ubuntu host is missing one or more security-related patches. File : ubuntu_USN-601-1.nasl - Type : ACT_GATHER_INFO
2008-04-17	Name : The remote CentOS host is missing a security update. File : centos_RHSA-2008-0214.nasl - Type : ACT_GATHER_INFO
2008-04-11	Name : The remote Red Hat host is missing a security update. File : redhat-RHSA-2008-0214.nasl - Type : ACT_GATHER_INFO
2008-02-06	Name : The remote Debian host is missing a security-related update. File : debian_DSA-1482.nasl - Type : ACT_GATHER_INFO
2008-01-10	Name : The remote Gentoo host is missing one or more security-related patches. File : gentoo_GLSA-200801-05.nasl - Type : ACT_GATHER_INFO
2008-01-10	Name : The remote Ubuntu host is missing one or more security-related patches. File : ubuntu_USN-565-1.nasl - Type : ACT_GATHER_INFO
2007-12-31	Name : The remote openSUSE host is missing a security update. File : suse_squid-4779.nasl - Type : ACT_GATHER_INFO
2007-12-31	Name : The remote SuSE 10 host is missing a security-related patch. File : suse_squid-4782.nasl - Type : ACT_GATHER_INFO
2007-12-19	Name : The remote Red Hat host is missing a security update. File : redhat-RHSA-2007-1130.nasl - Type : ACT_GATHER_INFO
2007-12-19	Name : The remote CentOS host is missing a security update. File : centos_RHSA-2007-1130.nasl - Type : ACT_GATHER_INFO
2007-12-17	Name : The remote Fedora host is missing a security update. File : fedora_2007-4170.nasl - Type : ACT_GATHER_INFO
2007-12-17	Name : The remote Fedora host is missing a security update. File : fedora_2007-4161.nasl - Type : ACT_GATHER_INFO
2007-12-07	Name : The remote FreeBSD host is missing one or more security-related updates. File : freebsd_pkg_6eb580d7a29c11dc8919001c2514716c.nasl - Type : ACT_GATHER_INFO
2007-12-04	Name : The remote proxy server is prone to a denial of service attack. File : squid_2_6_17.nasl - Type : ACT_GATHER_INFO

Global Informations

Type	Count
CWE ID(s)	1
Oval ID(s)	7
CPE ID(s)	38
osvdb(s)	1
Openvas Exploit(s)	25
Snort® Rule(s)	1
Nessus® Exploit(s)	22

	Related
5	CVE-2007-6239
Info : listing not affected by your CVSS Env Score

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