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SCO Security Advisory

Subject: UnixWare 7.1.4 : squid updated package fixes several security issues
Advisory number: SCOSA-2005.16
Issue date: 2005 February 11
Cross reference: sr890343 fz529457 erg712610 sr892199 fz530514 erg712740 CAN-2004-0189 CAN-2004-0918
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1. Problem Description

The asn_parse_header function (asn1.c) in the SNMP module
for Squid Web Proxy Cache before 2.4.STABLE7 allows remote
attackers to cause a denial of service (server restart) via
certain SNMP packets with negative length fields that causes
a memory allocation error.

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 and CAN-2004-0918 to this issues.

2. Vulnerable Supported Versions

System Binaries
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UnixWare 7.1.4 distribution

3. Solution

The proper solution is to install the latest packages.

4. UnixWare 7.1.4

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.16

or

The fixes are also available in SCO UnixWare 7.1.4 Mantenance Pack 2

http://www.sco.com/support/update/download/release.php?rid=58

4.2 Verification

MD5 (squid.pkg) = 6c33ff5d3b7bac965e2c816f0ae489eb

or

MD5 (uw714mp2.iso) = 335919be68f54253852cb8abca11814a

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

4.3 Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

Download squid.pkg to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/squid.pkg

or

See ftp://ftp.sco.com/pub/unixware7/714/mp/mp2/uw714mp2.txt

5. References

Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189
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-2004-0918

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 sr890343 fz529457
erg712610 sr892199 fz530514 erg712740.

6. 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.

7. Acknowledgments

SCO would like to thank Mitch Adair reported %00 bug and
Duane Wessels, for patching the %00 bug and adding the
urllogin ACL type.

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