[RHSA-2004:133-01] Updated squid package fixes security vulnerability

Wed Apr 14 14:13:00 UTC 2004

An updated squid package is avaliable that fixes a security vulnerability in
URL decoding and provides a new ACL type for protecting vulnerable clients.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, ppc64, s390, s390x, x86_64
Red Hat Enterprise Linux ES version 3 - i386
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Problem description:

Squid is a full-featured Web proxy cache.

A bug was found in the processing of %-encoded characters in a URL in
versions of Squid 2.5.STABLE4 and earlier.  If a Squid configuration uses
Access Control Lists (ACLs), a remote attacker could create URLs that would
not be correctly tested against Squid's ACLs, potentially allowing clients
to access prohibited URLs.

Users of Squid should update to these erratum packages which are not
vulnerable to this issue.

In addition, these packages contain a new Access Control type, "urllogin",
which can be used to protect vulnerable Microsoft Internet Explorer clients
from accessing URLs that contain login information.  Such URLs are often
used by fraudsters to trick web users into revealing valuable personal data.

Note that the default Squid configuration does not make use of this new
access control type.  You must explicitly configure Squid with ACLs that
use this new type, in accordance with your own site policies.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL
Certificate Errors, you need to install a version of the
up2date client with an updated certificate.  The latest version of
up2date is available from the Red Hat FTP site and may also be
downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

118032 - CAN-2004-0189 Squid ACL bypass

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/squid-2.4.STABLE6-10.21as.src.rpm

i386:
Available from Red Hat Network: squid-2.4.STABLE6-10.21as.i386.rpm

ia64:
Available from Red Hat Network: squid-2.4.STABLE6-10.21as.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/squid-2.4.STABLE6-10.21as.src.rpm

ia64:
Available from Red Hat Network: squid-2.4.STABLE6-10.21as.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/squid-2.4.STABLE6-10.21as.src.rpm

i386:
Available from Red Hat Network: squid-2.4.STABLE6-10.21as.i386.rpm

Red Hat Enterprise Linux AS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/squid-2.5.STABLE3-5.3E.src.rpm

i386:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.i386.rpm

ia64:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.ia64.rpm

ppc:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.ppc.rpm

ppc64:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.ppc64.rpm

s390:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.s390.rpm

s390x:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.s390x.rpm

x86_64:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/squid-2.5.STABLE3-5.3E.src.rpm

i386:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.i386.rpm

Red Hat Enterprise Linux WS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/squid-2.5.STABLE3-5.3E.src.rpm

i386:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.i386.rpm

ia64:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.ia64.rpm

x86_64:
Available from Red Hat Network: squid-2.5.STABLE3-5.3E.x86_64.rpm

7. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------

465f0c77fd485041607ffe5b65e3adfa 2.1AS/en/os/SRPMS/squid-2.4.STABLE6-10.21as.src.rpm
2f72879474d822e5ee35c6169f3d350d 2.1AS/en/os/i386/squid-2.4.STABLE6-10.21as.i386.rpm
a039857fa6ac4492986f508f0554c75b 2.1AS/en/os/ia64/squid-2.4.STABLE6-10.21as.ia64.rpm
465f0c77fd485041607ffe5b65e3adfa 2.1AW/en/os/SRPMS/squid-2.4.STABLE6-10.21as.src.rpm
a039857fa6ac4492986f508f0554c75b 2.1AW/en/os/ia64/squid-2.4.STABLE6-10.21as.ia64.rpm
465f0c77fd485041607ffe5b65e3adfa 2.1ES/en/os/SRPMS/squid-2.4.STABLE6-10.21as.src.rpm
2f72879474d822e5ee35c6169f3d350d 2.1ES/en/os/i386/squid-2.4.STABLE6-10.21as.i386.rpm
2732d4487caab1fa0d3238dbe2c6a1e6 3AS/en/os/SRPMS/squid-2.5.STABLE3-5.3E.src.rpm
f49a76f72f5811387b337cbfe6fea983 3AS/en/os/i386/squid-2.5.STABLE3-5.3E.i386.rpm
f436a858a28cf351802a7ae4b792d9ca 3AS/en/os/ia64/squid-2.5.STABLE3-5.3E.ia64.rpm
3c5c99d1fea5ab90596557a78ef21a91 3AS/en/os/ppc/squid-2.5.STABLE3-5.3E.ppc.rpm
f230504e2f3aee72fe46754ae0dc0e9e 3AS/en/os/ppc64/squid-2.5.STABLE3-5.3E.ppc64.rpm
9370229f49341fa002dfc566edbae0e6 3AS/en/os/s390/squid-2.5.STABLE3-5.3E.s390.rpm
5b5b760cb7b52691c1055b87bdc33183 3AS/en/os/s390x/squid-2.5.STABLE3-5.3E.s390x.rpm
9041369b91c153bb4f7ba392c62327ae 3AS/en/os/x86_64/squid-2.5.STABLE3-5.3E.x86_64.rpm
2732d4487caab1fa0d3238dbe2c6a1e6 3ES/en/os/SRPMS/squid-2.5.STABLE3-5.3E.src.rpm
f49a76f72f5811387b337cbfe6fea983 3ES/en/os/i386/squid-2.5.STABLE3-5.3E.i386.rpm
2732d4487caab1fa0d3238dbe2c6a1e6 3WS/en/os/SRPMS/squid-2.5.STABLE3-5.3E.src.rpm
f49a76f72f5811387b337cbfe6fea983 3WS/en/os/i386/squid-2.5.STABLE3-5.3E.i386.rpm
f436a858a28cf351802a7ae4b792d9ca 3WS/en/os/ia64/squid-2.5.STABLE3-5.3E.ia64.rpm
9041369b91c153bb4f7ba392c62327ae 3WS/en/os/x86_64/squid-2.5.STABLE3-5.3E.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/team/key.html

You can verify each package with the following command:

    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:

    md5sum <filename>

8. References:

http://www.squid-cache.org/Advisories/SQUID-2004_1.txt
http://www.microsoft.com/security/incident/spoof.asp
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189

9. Contact:

The Red Hat security contact is <secalert at redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact.html

Copyright 2004 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQFAfUcJXlSAg2UNWIIRAoCbAJ4qZGwqGSdxMgRSdH10DebMa644+ACfWVfS
Hjqj8KiS5beDPsxiknHYVsQ=
=rwbK
-----END PGP SIGNATURE-----