[RHSA-2004:134-01] Updated squid package fixes security vulnerability

bugzilla_at_redhat.com
Date: 03/29/04

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                       Red Hat Security Advisory

    Synopsis: Updated squid package fixes security vulnerability
    Advisory ID: RHSA-2004:134-01
    Issue date: 2004-03-29
    Updated on: 2004-03-29
    Product: Red Hat Linux
    Keywords: phishing spoofing
    Cross references:
    Obsoletes:
    CVE Names: CAN-2004-0189
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    1. Topic:

    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 Linux 9 - i386

    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. RPMs required:

    Red Hat Linux 9:

    SRPMS:
    ftp://updates.redhat.com/9/en/os/SRPMS/squid-2.5.STABLE1-3.9.src.rpm

    i386:
    ftp://updates.redhat.com/9/en/os/i386/squid-2.5.STABLE1-3.9.i386.rpm

    6. Verificationx:

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

    3a78ab4b0423bdbfc5b6bb36897b78ce 9/en/os/SRPMS/squid-2.5.STABLE1-3.9.src.rpm
    348ca4845204fadad07116be64d9767e 9/en/os/i386/squid-2.5.STABLE1-3.9.i386.rpm

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

    7. 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

    8. Contact:

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

    Copyright 2003 Red Hat, Inc.
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