(Mandrake Issues Fix) Squid Proxy Cache '%00' URL Character Access Control Bug May Let Remote Users Bypass Certain Access Controls
|
|
SecurityTracker Alert ID: 1009612
|
|
CVE Reference: CAN-2004-0189
(Links to External Site)
|
Date: Apr 1 2004
|
Impact: Host/resource access via network
|
Fix Available: Yes
Vendor Confirmed: Yes
|
Version(s): Squid-2.x up to and including 2.5.STABLE4
|
Description: A vulnerability was reported in the Squid Proxy Cache server in the processing of URLs containing '%00'. A remote user may be able to bypass certain access controls.
It is reported that a flaw in the '%xx' URL decoding function may allow a remote user to bypass access controls that use 'url_regex'
access control list (ACL) types. The report indicates that Squid will insert a NUL character in place of '%00' in a URL before
analyzing the URL for access control purposes. As a result, the 'http://foo%00@www.example.com/' URL will not be properly detected
as a URL to be denied in accordance with the following type of access control configuration:
acl BadSite url_regex www\.example\.com
http_access deny BadSite
In this example, Squid will attempt to compare 'http://foo' with 'www\.example\.com' and will not
find a match, so the URL will not be denied.
Mitch Adair is credited with reporting this flaw.
|
Impact: A remote user may be able to submit a specially crafted URL to bypass url_regex access controls.
|
Solution: Mandrake has released a fix.
Corporate Server 2.1:
4fd20ca8507ea60149bd4795fed01f1a corporate/2.1/RPMS/squid-2.4.STABLE7-2.1.C21mdk.i586.rpm
5d800fb0ebf900f60ef1ba1eccb07642 corporate/2.1/SRPMS/squid-2.4.STABLE7-2.1.C21mdk.src.rpm
Corporate Server 2.1/x86_64:
b28afa1eee2601d93919ab9b87c88cc1
x86_64/corporate/2.1/RPMS/squid-2.4.STABLE7-2.1.C21mdk.x86_64.rpm
5d800fb0ebf900f60ef1ba1eccb07642 x86_64/corporate/2.1/SRPMS/squid-2.4.STABLE7-2.1.C21mdk.src.rpm
Mandrakelinux 9.1:
97f8a5010fcd34e2017cdddeca1871a8 9.1/RPMS/squid-2.5.STABLE1-7.1.91mdk.i586.rpm
77830b2c1f4b08013cf6ca3d90687927
9.1/SRPMS/squid-2.5.STABLE1-7.1.91mdk.src.rpm
Mandrakelinux 9.1/PPC:
123e83676d55a1c465040db5f1e688d4 ppc/9.1/RPMS/squid-2.5.STABLE1-7.1.91mdk.ppc.rpm
77830b2c1f4b08013cf6ca3d90687927 ppc/9.1/SRPMS/squid-2.5.STABLE1-7.1.91mdk.src.rpm
Mandrakelinux 9.2:
16fa9ee0eed04bcd4e23aab9864adc10
9.2/RPMS/squid-2.5.STABLE3-3.1.92mdk.i586.rpm
9671d4f57c43ca371bb9437b5480bfe1 9.2/SRPMS/squid-2.5.STABLE3-3.1.92mdk.src.rpm
Mandrakelinux 9.2/AMD64:
6d9c8708456e3e581a2d0e4006073d9a amd64/9.2/RPMS/squid-2.5.STABLE3-3.1.92mdk.amd64.rpm
9671d4f57c43ca371bb9437b5480bfe1
amd64/9.2/SRPMS/squid-2.5.STABLE3-3.1.92mdk.src.rpm
Mandrakelinux 10.0:
a72b8ebf3da3d8435693301312fa475e 10.0/RPMS/squid-2.5.STABLE4-1.100mdk.i586.rpm
6c2930b14c1c18228159f78a9892eb65 10.0/SRPMS/squid-2.5.STABLE4-1.100mdk.src.rpm
Multi Network Firewall 8.2:
7bb35a615f5e95270f2514bd19ddf69d
mnf8.2/RPMS/squid-2.4.STABLE7-1.2.M82mdk.i586.rpm
7a590e5539a260dc6dc468c12c7f641d mnf8.2/SRPMS/squid-2.4.STABLE7-1.2.M82mdk.src.rpm
|
Vendor URL: www.squid-cache.org/Advisories/SQUID-2004_1.txt (Links to External Site)
|
Cause: Access control error
|
Underlying OS: Linux (Mandrake)
|
Underlying OS Comments: 9.1, 9.2, 10.0, Corporate Server 2.1, Multi Network Firewall 8.2
|
Reported By: Mandrake Linux Security Team <security@linux-mandrake.com>
|
Message History:
This archive entry is a follow-up to the message listed below.
|
Source Message Contents
|
Date: 31 Mar 2004 00:24:44 -0000
From: Mandrake Linux Security Team <security@linux-mandrake.com>
Subject: MDKSA-2004:025 - Updated squid packages fix vulnerability
|
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
_______________________________________________________________________
Mandrakelinux Security Update Advisory
_______________________________________________________________________
Package name: squid
Advisory ID: MDKSA-2004:025
Date: March 30th, 2004
Affected versions: 9.1, 9.2, 10.0, Corporate Server 2.1,
Multi Network Firewall 8.2
______________________________________________________________________
Problem Description:
A vulnerability was discovered in squid version 2.5.STABLE4 and
earlier with the processing of %-encoded characters in a URL. If a
squid configuration uses ACLs (Access Control Lists), it is possible
for a remote attacker to create URLs that would not be properly tested
against squid's ACLs, potentially allowing clients to access URLs that
would otherwise be disallowed.
As well, the provided packages for Mandrake Linux 9.2 and 9.1 include a
new Access Control type called "urllogin" which can be used to protect
vulnerable Microsoft Internet Explorer clients from accessing URLs that
contain login information. While this Access Control type is available,
it is not used in the default configuration.
The updated packages are patched to protect against these
vulnerabilities.
_______________________________________________________________________
References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189
http://www.squid-cache.org/Advisories/SQUID-2004_1.txt
http://www.microsoft.com/security/incident/spoof.asp
______________________________________________________________________
Updated Packages:
Corporate Server 2.1:
4fd20ca8507ea60149bd4795fed01f1a corporate/2.1/RPMS/squid-2.4.STABLE7-2.1.C21mdk.i586.rpm
5d800fb0ebf900f60ef1ba1eccb07642 corporate/2.1/SRPMS/squid-2.4.STABLE7-2.1.C21mdk.src.rpm
Corporate Server 2.1/x86_64:
b28afa1eee2601d93919ab9b87c88cc1 x86_64/corporate/2.1/RPMS/squid-2.4.STABLE7-2.1.C21mdk.x86_64.rpm
5d800fb0ebf900f60ef1ba1eccb07642 x86_64/corporate/2.1/SRPMS/squid-2.4.STABLE7-2.1.C21mdk.src.rpm
Mandrakelinux 9.1:
97f8a5010fcd34e2017cdddeca1871a8 9.1/RPMS/squid-2.5.STABLE1-7.1.91mdk.i586.rpm
77830b2c1f4b08013cf6ca3d90687927 9.1/SRPMS/squid-2.5.STABLE1-7.1.91mdk.src.rpm
Mandrakelinux 9.1/PPC:
123e83676d55a1c465040db5f1e688d4 ppc/9.1/RPMS/squid-2.5.STABLE1-7.1.91mdk.ppc.rpm
77830b2c1f4b08013cf6ca3d90687927 ppc/9.1/SRPMS/squid-2.5.STABLE1-7.1.91mdk.src.rpm
Mandrakelinux 9.2:
16fa9ee0eed04bcd4e23aab9864adc10 9.2/RPMS/squid-2.5.STABLE3-3.1.92mdk.i586.rpm
9671d4f57c43ca371bb9437b5480bfe1 9.2/SRPMS/squid-2.5.STABLE3-3.1.92mdk.src.rpm
Mandrakelinux 9.2/AMD64:
6d9c8708456e3e581a2d0e4006073d9a amd64/9.2/RPMS/squid-2.5.STABLE3-3.1.92mdk.amd64.rpm
9671d4f57c43ca371bb9437b5480bfe1 amd64/9.2/SRPMS/squid-2.5.STABLE3-3.1.92mdk.src.rpm
Mandrakelinux 10.0:
a72b8ebf3da3d8435693301312fa475e 10.0/RPMS/squid-2.5.STABLE4-1.100mdk.i586.rpm
6c2930b14c1c18228159f78a9892eb65 10.0/SRPMS/squid-2.5.STABLE4-1.100mdk.src.rpm
Multi Network Firewall 8.2:
7bb35a615f5e95270f2514bd19ddf69d mnf8.2/RPMS/squid-2.4.STABLE7-1.2.M82mdk.i586.rpm
7a590e5539a260dc6dc468c12c7f641d mnf8.2/SRPMS/squid-2.4.STABLE7-1.2.M82mdk.src.rpm
_______________________________________________________________________
To upgrade automatically use MandrakeUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.
A list of FTP mirrors can be obtained from:
http://www.mandrakesecure.net/en/ftp.php
All packages are signed by Mandrakesoft for security. You can obtain
the GPG public key of the Mandrakelinux Security Team by executing:
gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98
Please be aware that sometimes it takes the mirrors a few hours to
update.
You can view other update advisories for Mandrakelinux at:
http://www.mandrakesecure.net/en/advisories/
Mandrakesoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:
http://www.mandrakesecure.net/en/mlist.php
If you want to report vulnerabilities, please contact
security_linux-mandrake.com
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security linux-mandrake.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)
iD8DBQFAag/MmqjQ0CJFipgRAvJ+AJ4hravLm8ErP4q4quvgSNS/7WSUvgCgsYlI
9XreEbW5qKXj4Zq5F57WgSs=
=SfIU
-----END PGP SIGNATURE-----
|
|
