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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
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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
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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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