Squid url_regex ACL bypass

squid-urlregex-acl-bypass (15366) The risk level is classified as MediumMedium Risk

Description:

Squid Web Proxy Cache could allow a remote attacker to bypass Access Control Lists (ACL). By sending a specially-crafted URL request containing '%00', the url_regex ACL may not properly detect the malicious URL, allowing the attacker to bypass the ACL.


Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of Squid (2.5.stable5 or later), available from the Squid Web site. See References.

For Red Hat Linux 9:
Upgrade to the latest version of squid (2.5.STABLE1-3.9 or later), as listed in RHSA-2004:134-01. See References.

For Debian/GNU Linux 3.0 (woody):
Upgrade to the lastest version of squid (2.4.6-2woody2 or later), as listed in DSA-474-1. See References.

For Conectiva Linux:
Upgrade to the latest squid package, as listed below. Refer to Conectiva Linux Security Announcement CLSA-2004:838. See References.

Conectiva Linux 8: 2.4.7-1U80_4cl or later
Conectiva Linux 9: 2.5.5-25761U90_3cl or later

For SCO OpenServer 5.0.6, and 5.0.7:
Upgrade to the appropriate fixed binaries, as listed in SCO Security Advisory SCOSA-2004.13. See References.

For SCO UnixWare 7.1.4:
Upgrade to the appropriate fixed binaries, as listed in SCO Security Advisory SCOSA-2005.16. See References.

For Turbolinux:
Upgrade to the latest squid package, as listed below. Refer to Turbolinux Security Advisory TLSA-2004-24 for more information. See References.

Turbolinux Appliance Server 1.0 Hosting Edition: 2.5.STABLE6-9 or later
Turbolinux 8 Server and Workstation: 2.5.STABLE6-7or later
Turbolinux 7 Server and Workstation: 2.5.STABLE6-7 or later

For OpenPKG:
Refer to OpenPKG Security Advisory OpenPKG-SA-2004.008 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

Platforms Affected:

  • Conectiva Linux 8.0
  • Conectiva Linux 9.0
  • Debian Debian Linux 3.0
  • Gentoo Linux
  • MandrakeSoft Mandrake Linux 10.0 AMD64
  • MandrakeSoft Mandrake Linux 10.0
  • MandrakeSoft Mandrake Linux 9.1 PPC
  • MandrakeSoft Mandrake Linux 9.1
  • MandrakeSoft Mandrake Linux 9.2 AMD64
  • MandrakeSoft Mandrake Linux 9.2
  • MandrakeSoft Mandrake Linux Corporate Server 2.1 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 2.1
  • MandrakeSoft Mandrake Multi Network Firewall 8.2
  • OpenPKG OpenPKG 1.3
  • OpenPKG OpenPKG 2.0
  • OpenPKG OpenPKG CURRENT
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Enterprise Linux 2.1 ES
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 3 ES
  • RedHat Linux 9.0
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • SCO SCO OpenServer 5.0.6
  • SCO SCO OpenServer 5.0.7
  • SCO SCO UnixWare 7.1.4
  • Squid-Cache Squid 2.0.PATCH2
  • Squid-Cache Squid 2.1.PATCH2
  • Squid-Cache Squid 2.3 STABLE5
  • Squid-Cache Squid 2.3. STABLE4
  • Squid-Cache Squid 2.4
  • Squid-Cache Squid 2.4.STABLE2
  • Squid-Cache Squid 2.4.STABLE6
  • Squid-Cache Squid 2.4.STABLE7
  • Squid-Cache Squid 2.5.STABLE1
  • Squid-Cache Squid 2.5.STABLE3
  • Squid-Cache Squid 2.5.STABLE4
  • Turbolinux Turbolinux 7 Server
  • Turbolinux Turbolinux 7 Workstation
  • Turbolinux Turbolinux 8 Server
  • Turbolinux Turbolinux 8 Workstation
  • Turbolinux Turbolinux Appliance Server 1.0
  • Turbolinux Turbolinux Appliance Server 1.0 Hosting Ed
  • Turbolinux Turbolinux Appliance Server 1.0 Workgroup Ed

Reported:

Mar 01, 2004

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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