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OpenServer 5.0.6 OpenServer 5.0.7 : squid %-encoded characters in a URL
From: please_reply_to_security () sco com
Date: Tue, 31 Aug 2004 13:10:39 -0700 (PDT)


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______________________________________________________________________________

                        SCO Security Advisory

Subject:                OpenServer 5.0.6 OpenServer 5.0.7 : squid %-encoded characters in a URL
Advisory number:        SCOSA-2004.13
Issue date:             2004 August 31
Cross reference:        sr890342 fz529456 erg712609 CAN-2004-0189
______________________________________________________________________________


1. Problem Description

        The "%xx" URL decoding function in Squid 2.5STABLE4 and
        earlier allows remote attackers to bypass url_regex ACLs
        via a URL with a NULL ("%00") character, which causes Squid
        to use only a portion of the requested URL when comparing
        it against the access control lists. 

        The Common Vulnerabilities and Exposures project (cve.mitre.org) 
        has assigned the name CAN-2004-0189 to this issue.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 5.0.6                Squid distribution < 2.5.STABLE5
        OpenServer 5.0.7                Squid distribution < 2.5.STABLE5

3. Solution

        The proper solution is to install the latest packages.

4. OpenServer 5.0.6

        4.1 First install oss646c or later

        4.2 Location of oss646c

        ftp://ftp.sco.com/pub/openserver5/oss646c/

        4.3 Verification of oss646c

        MD5 (VOL.000.000) = f19b6c6949f615316bfb075d249989e8
        MD5 (VOL.000.001) = 341ff8553aecd2c7b0c2beaf83030d0f
        MD5 (VOL.000.002) = 6e46708ad8029e12280d4f9ac60ab814
        MD5 (VOL.000.003) = 2868b64a6a6db742adb3b485be645d7e
        MD5 (VOL.000.004) = 1696fe1db9bb063827ee5e76e58dff84
        MD5 (VOL.000.005) = f39da342f8af72fcaccdf478dca04109
        MD5 (VOL.000.006) = 2b31611c8af7d2e7910d6e8e3cf701a6
        MD5 (VOL.000.007) = d0175c0f4e3ed29435b1eab95609f8f4
        MD5 (VOL.000.008) = aa9e8a525c341fed077f981b1dacb486
        MD5 (VOL.000.009) = 8e023af67b57507824406bdda322079a
        MD5 (VOL.000.010) = 2b46e8adba8ae0b64109f2069da978a2

        4.4 Installation of oss646c

        See ftp://ftp.sco.com/pub/openserver5/oss646c/oss646c.txt

        4.5 Next install xorg-6.7.0Ba or later

        4.6 Location of xorg-6.7.0Ba

        ftp://ftp.sco.com/pub/openserver5/opensrc/xorg-6.7.0Ba/

        4.7 Verification of xorg-6.7.0Ba

        MD5 (VOL.000.000) = 289d1070c4135e4d25a20501dbca08d8
        MD5 (VOL.000.001) = 4111dadf961d4ef88e89112070f3e811
        MD5 (VOL.000.002) = 4c4cdf4bf4c28045b7b323cfa407829f
        MD5 (VOL.000.003) = d7e8da318d1c4df6fff14f60d993cf45
        MD5 (VOL.000.004) = bfc0571f1fededd1780fafa76db9be90

        4.8 Installation of xorg-6.7.0Ba

        See ftp://ftp.sco.com/pub/openserver5/opensrc/xorg-6.7.0Ba/xorg67_rn.txt

        4.9 Next install gwxlibs-1.3.3Db or later

        4.10 Location of gwxlibs-1.3.3Db

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.10

        4.11 Verification

        MD5 (VOL.000.000) = a85cf35c417903522392064aaa98f0a4
        MD5 (VOL.000.001) = d4383d6bc74bb6e873e7a4c8dfdc4e6b
        MD5 (VOL.000.002) = c5657b1358ef96177ae15fdcfec7132f
        MD5 (VOL.000.003) = 4c88ceb3502330b4c4d5e07ca7fc5214

        4.12 Installation of gwxlibs-1.3.3Db

        See ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.10/SCOSA-2004.10.txt

        4.13 Next install perl-5.8.4Aa or later

        4.14 Location of perl-5.8.4Aa

        ftp://ftp.sco.com/pub/openserver5/opensrc/perl-5.8.4Aa/

        4.15 Verification

        MD5 (VOL.000.000) = b83b5e0ae513a1cb206baf37c4741653
        MD5 (VOL.000.001) = 1ab35276079e7661e38b72047cec488a
        MD5 (VOL.000.002) = 64a76371eae54e95d0b7e99be25f0a8a
        MD5 (VOL.000.003) = 724521beddc740ae4958fd63d1c45f3f
        MD5 (VOL.000.004) = f1d631477f16ce7b9512fbe60d9e3d0e

        4.16 Installation of perl-5.8.4Aa

        See ftp://ftp.sco.com/pub/openserver5/opensrc/perl-5.8.4Aa/perl584_rn.txt

        4.17 Location of Squid Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.13

        4.18 Verification

        MD5 (VOL.000.000) = 656d0097b861d9e2375f672579e15c6b
        MD5 (VOL.000.001) = 4f15cb68083fb6ceff3dd3c72aed41a2
        MD5 (VOL.000.002) = 6fbf1b23e9d86f621de916bca4e476b3
        MD5 (VOL.000.003) = fefcfc2f2d4f56e8be34d917a882bd41

        md5 is available for download from
                ftp://ftp.sco.com/pub/security/tools

        4.19 Installing Fixed Binaries

        Upgrade the affected binaries with the following sequence:

        1) Download the VOL* files to a directory.

        2) Run the custom command, specify an install from media
        images, and specify the directory as the location of
        the images.


5. OpenServer 5.0.7

        5.1 Location of Fixed Binaries

        Supplement CD 3

        http://www.sco.com/support/update/download/osr507list.html

        5.2 Verification

        MD5 (osr507suppcd3.iso) = 129229594bd3a020db429e7de8b95def

        md5 is available for download from
                ftp://ftp.sco.com/pub/security/tools

        5.3 Installing Fixed Binaries

        See the Supplement CD 3 Release Notes

        ftp://ftp.sco.com/pub/openserver5/507/iso/suppcd3/osr507suppcd3.txt

6. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189 
                http://xforce.iss.net/xforce/xfdb/15366

        SCO security resources:
                http://www.sco.com/support/security/index.html

        SCO security advisories via email
                http://www.sco.com/support/forums/security.html

        This security fix closes SCO incidents sr890342 fz529456
        erg712609.


7. Disclaimer

        SCO is not responsible for the misuse of any of the information
        we provide on this website and/or through our security
        advisories. Our advisories are a service to our customers
        intended to promote secure installation and use of SCO
        products.

______________________________________________________________________________

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