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Category: Application (Generic) > Squid

Vendors: Squid-cache.org

(Debian Issues Fix) Squid Proxy Cache '%00' URL Character Access Control Bug May Let Remote Users Bypass Certain Access Controls

SecurityTracker Alert ID: 1009658

CVE Reference: CAN-2004-0189 (Links to External Site)

Date: Apr 4 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.

Vendor URL: www.squid-cache.org/Advisories/SQUID-2004_1.txt (Links to External Site)

Cause: Access control error

Underlying OS: Linux (Debian)

Underlying OS Comments: 3.0

Reported By: Matt Zimmerman <mdz@debian.org>

Message History: This archive entry is a follow-up to the message listed below.

Mar 1 2004

Squid Proxy Cache '%00' URL Character Access Control Bug May Let Remote Users Bypass Certain Access Controls

Source Message Contents

Date: Sat, 3 Apr 2004 22:09:37 -0800
From: Matt Zimmerman <mdz@debian.org>
Subject: [SECURITY] [DSA 474-1] New squid packages fix ACL bypass

 

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA 474-1                     security@debian.org
http://www.debian.org/security/                             Matt Zimmerman
April 3rd, 2004                         http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : squid
Problem-Type   : ACL bypass
Debian-specific: no
CVE Ids        : CAN-2004-0189

A vulnerability was discovered in squid, an Internet object cache,
whereby access control lists based on URLs could be bypassed
(CAN-2004-0189).  Two other bugs were also fixed with patches
squid-2.4.STABLE7-url_escape.patch (a buffer overrun which does not
appear to be exploitable) and squid-2.4.STABLE7-url_port.patch (a
potential denial of service).

For the stable distribution (woody) these problems have been fixed in
version 2.4.6-2woody2.

For the unstable distribution (sid) these problems have been fixed in
version 2.5.5-1.

We recommend that you update your squid package.

Upgrade Instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.0 alias woody
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2.dsc
      Size/MD5 checksum:      621 d61b7bf783830f071f5f091db85864aa
    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2.diff.gz
      Size/MD5 checksum:   224311 e1fbff609b3957f2f0a834fe5ffba8dd
    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6.orig.tar.gz
      Size/MD5 checksum:  1081920 59ce2c58da189626d77e27b9702ca228

  Alpha architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_alpha.deb
      Size/MD5 checksum:   814744 342a3a95c73aa998461bb7519f1b6d6a
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_alpha.deb
      Size/MD5 checksum:    75134 574f070f7a7fbd6a43246b42a1db9a39
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_alpha.deb
      Size/MD5 checksum:    59926 c93d20eeb1563fb78c5085453abebd4b

  ARM architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_arm.deb
      Size/MD5 checksum:   724730 3b83ffa98670b7f9fe8eb431cd7e479b
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_arm.deb
      Size/MD5 checksum:    72542 efd5e8842815d2928d5bd4033907dce0
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_arm.deb
      Size/MD5 checksum:    58278 f436043d4b1139179af520a7a6b1b8d6

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_i386.deb
      Size/MD5 checksum:   698508 0aedc49b881f8d780c55290e09924efe
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_i386.deb
      Size/MD5 checksum:    72896 3277f9f2a974093b22d85dcbe8fd86ff
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_i386.deb
      Size/MD5 checksum:    57538 ccf05d0a3027e2f54253b023f139005e

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_ia64.deb
      Size/MD5 checksum:   952742 e4e67ae336927d9816941016eeccccea
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_ia64.deb
      Size/MD5 checksum:    78324 19c0e74ae46fe1f158cf7988c4e9bb1b
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_ia64.deb
      Size/MD5 checksum:    62594 6cb77e23ac2d571d6e9c9ca9b993ed2b

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_hppa.deb
      Size/MD5 checksum:   778878 f39bf46bd07598ba48783eb8ddd392a7
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_hppa.deb
      Size/MD5 checksum:    73912 f315c3aba6b2e47f8ab96741cdb0738a
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_hppa.deb
      Size/MD5 checksum:    59422 329334888b68fed99760a6f2749010b1

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_m68k.deb
      Size/MD5 checksum:   664804 d3e929ea6f786b8791ce20077ef62872
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_m68k.deb
      Size/MD5 checksum:    71856 535cd33a38f10d8813bbfab75591b956
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_m68k.deb
      Size/MD5 checksum:    57496 63e90d2bda866227a745fcad95c45d5a

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_mips.deb
      Size/MD5 checksum:   764688 c6eefe3b6f9b8b4f5df943baa6a7a5dd
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_mips.deb
      Size/MD5 checksum:    73436 d5e34594b15e52097a84f5dabd3ec100
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_mips.deb
      Size/MD5 checksum:    58584 d9a275f87449d3531c302b531091800c

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody1_mipsel.deb
      Size/MD5 checksum:   763980 9f987ecd9a8ff462dbf1263739f1b8f1
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody1_mipsel.deb
      Size/MD5 checksum:    73432 e8b9c5bd013b013c6e859dc3af31dd0e
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody1_mipsel.deb
      Size/MD5 checksum:    58566 0b4cce0a9c8f989259dae10cf7fe957d

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_powerpc.deb
      Size/MD5 checksum:   721636 0d9260b21bca35c26ed15d9a423d469f
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_powerpc.deb
      Size/MD5 checksum:    72498 b323cd2d039903ae92c0b433062ef376
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_powerpc.deb
      Size/MD5 checksum:    58170 19070ddbd50f03df0d0d9d0a4832781c

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_s390.deb
      Size/MD5 checksum:   711180 80e6122e4505a03aa0ebee9993fb5c18
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_s390.deb
      Size/MD5 checksum:    72856 0b79555fe254218e3a159b23065f949c
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_s390.deb
      Size/MD5 checksum:    58718 de157f9dad34a4f28b2b41c6562ea2f1

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2_sparc.deb
      Size/MD5 checksum:   723914 f3465e678067c079e1e9e2d4abca0cca
    http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2woody2_sparc.deb
      Size/MD5 checksum:    75184 2e49570a56c5741aa3190b473e6ec920
    http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2woody2_sparc.deb
      Size/MD5 checksum:    60592 eba58b5789a7eca6c7d91ff4a7f7c2fb

  These files will probably be moved into the stable distribution on
  its next revision.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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