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Category:   Application (Generic)  >   Squid Vendors:   Squid-cache.org
(SCO Issues Fix) Squid Proxy Cache Has Buffer Overflows in Processing Gopher and FTP Data and May Incorrectly Forward Proxy Authentication Credentials to Remote Web Sites
SecurityTracker Alert ID:  1006860
SecurityTracker URL:  http://securitytracker.com/id/1006860
CVE Reference:   CVE-2002-0713, CVE-2002-0714, CVE-2002-0715   (Links to External Site)
Date:  May 28 2003
Impact:   Disclosure of authentication information, Execution of arbitrary code via network, Host/resource access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Squid-2.x up to and including 2.4.STABLE6
Description:   Several vulnerabilities were reported in the Squid proxy cache server. A remote user could cause arbitrary code to be executed by the Squid server. A remote user may receive a user's proxy login credentials.

This may expose a user's private proxy login+password to selected external web sites, depending on the proxy configuration. According to the report, Squid may forward the proxy authentication credentials under some conditions (for example, when users are normally required to login to use the proxy but are allowed to access some sites without having to login).

It is also reported that the FTP proxy does not check the IP addresses of the control and data connections to ensure that they are the same as the address of the FTP server. A remote user can potentially spoof FTP server responses or bypass firewall rules.

To determine which version of Squid you are using, run the following command:

squid -v

If you are running version 2.4.STABLE6 or earlier, you may be affected. Also, if you are using a binary or otherwise pre-packaged version and have not upgraded to a version released after 2002-07-01, the vendor notes that you are most likely vulnerable to these issues.

Impact:   A remote user with authorization or ability to communicate via the Squid server may be able to cause arbitrary code to be executed on the server. The code may execute with root privileges.

A remote server may receive a user's proxy login credentials.

A remote user may be able to spoof FTP server responses.

Solution:   SCO has released a fix.

OpenServer 5.0.5:

Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.9


Verification

MD5 (VOL.000.000) = a4abc782d87415df7369a0483e3b1554
MD5 (VOL.000.001) = d91c192ac5ec45fe609d5a58fdf736b5
MD5 (VOL.000.002) = af55795c6ebbe9012c9eb5d8b2f6e57a
MD5 (VOL.000.003) = c5a74b7f6ab24a311b2fc24f01740ffe

md5 is available for download from
ftp://ftp.sco.com/pub/security/tools


Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to the /tmp directory

2) Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.


OpenServer 5.0.6:

Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.9


Verification

MD5 (VOL.000.000) = a4abc782d87415df7369a0483e3b1554
MD5 (VOL.000.001) = d91c192ac5ec45fe609d5a58fdf736b5
MD5 (VOL.000.002) = af55795c6ebbe9012c9eb5d8b2f6e57a
MD5 (VOL.000.003) = c5a74b7f6ab24a311b2fc24f01740ffe

md5 is available for download from
ftp://ftp.sco.com/pub/security/tools


Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to the /tmp directory

2) Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.

Vendor URL:  www.squid-cache.org/Advisories/SQUID-2002_3.txt (Links to External Site)
Cause:   Access control error, Boundary error, State error
Underlying OS:  UNIX (Open UNIX-SCO)
Underlying OS Comments:  OpenServer 5.0.5, 5.0.6

Message History:   This archive entry is a follow-up to the message listed below.
Jul 4 2002 Squid Proxy Cache Has Buffer Overflows in Processing Gopher and FTP Data and May Incorrectly Forward Proxy Authentication Credentials to Remote Web Sites



 Source Message Contents

Subject:  Security Update: [CSSA-2003-SCO.9] OpenServer 5.0.5 OpenServer 5.0.6 : Buffer overflows and other security vulnerabilities


--G4iJoqBmSsgzjUCe
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca

______________________________________________________________________________

			SCO Security Advisory

Subject:		OpenServer 5.0.5 OpenServer 5.0.6 : Buffer overflows and other security vulnerabilities in Squid
Advisory number: 	CSSA-2003-SCO.9
Issue date: 		2003 May 27
Cross reference:
______________________________________________________________________________


1. Problem Description

	 Vulnerability in Squid related to proxy authentication
	 credentials may allow remote web sites to obtain the user's
	 proxy login and password.

	 FTP proxy in Squid does not compare the IP addresses of
	 control and data connections with the FTP server, which
	 allows remote attackers to bypass firewall rules or spoof FTP
	 server responses.

	 Buffer overflows in Squid allow remote attackers to cause a
	 denial of service (crash) and possibly execute arbitrary code
	 (1) via the MSNT auth helper (msnt_auth) when using denyusers
	 or allowusers files, (2) via the gopher client, or (3) via
	 the FTP server directory listing parser when HTML output is
	 generated.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.5 		Squid distribution
	OpenServer 5.0.6		Squid distribution


3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.5

	4.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.9


	4.2 Verification

	MD5 (VOL.000.000) = a4abc782d87415df7369a0483e3b1554
	MD5 (VOL.000.001) = d91c192ac5ec45fe609d5a58fdf736b5
	MD5 (VOL.000.002) = af55795c6ebbe9012c9eb5d8b2f6e57a
	MD5 (VOL.000.003) = c5a74b7f6ab24a311b2fc24f01740ffe

	md5 is available for download from
		ftp://ftp.sco.com/pub/security/tools


	4.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	1) Download the VOL* files to the /tmp directory

	2) Run the custom command, specify an install from media
	images, and specify the /tmp directory as the location of
	the images.


5. OpenServer 5.0.6

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.9


	5.2 Verification

	MD5 (VOL.000.000) = a4abc782d87415df7369a0483e3b1554
	MD5 (VOL.000.001) = d91c192ac5ec45fe609d5a58fdf736b5
	MD5 (VOL.000.002) = af55795c6ebbe9012c9eb5d8b2f6e57a
	MD5 (VOL.000.003) = c5a74b7f6ab24a311b2fc24f01740ffe

	md5 is available for download from
		ftp://ftp.sco.com/pub/security/tools


	5.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	1) Download the VOL* files to the /tmp directory

	2) Run the custom command, specify an install from media
	images, and specify the /tmp directory as the location of
	the images.


6. References

	Specific references for this advisory:

		http://www.squid-cache.org/Advisories/SQUID-2002_3.txt
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0714
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0713
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0715

	SCO security resources:

		http://www.sco.com/support/security/index.html

	This security fix closes SCO incidents sr866632, fz521515,
	erg501628.


7. Disclaimer

	SCO is not responsible for the misuse of any of the information
	we provide on this website and/or through our security
	advisories. Our advisories are a service to our customers
	intended to promote secure installation and use of SCO
	products.


8. Acknowledgements

	The Squid Team discovered and researched these vulnerabilities.

______________________________________________________________________________

--G4iJoqBmSsgzjUCe
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--G4iJoqBmSsgzjUCe--

 
 


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