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AUSCERT External Security Bulletin Redistribution
ESB-2005.0093 -- SCO Security Advisory SCOSA-2005.6
OpenServer 5.0.6 OpenServer 5.0.7 : wu-ftp local users can
bypass access restrictions
27 January 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: wu-ftpd
Publisher: SCO
Operating System: OpenServer 5.0.6 and 5.0.7
Impact: Inappropriate Access
Access: Existing Account
CVE Names: CAN-2004-0148
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______________________________________________________________________________
SCO Security Advisory
Subject: OpenServer 5.0.6 OpenServer 5.0.7 : wu-ftp local users can bypass access restrictions
Advisory number: SCOSA-2005.6
Issue date: 2005 January 25
Cross reference: sr889579 fz528958 erg712568 CAN-2004-0148
______________________________________________________________________________
1. Problem Description
wu-ftpd 2.6.2 and earlier, with the restricted-gid option
enabled, allows local users to bypass access restrictions
by changing the permissions to prevent access to their home
directory, which causes wu-ftpd to use the root directory
instead.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0148 to this issue.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
OpenServer 5.0.5 Not vulnerable
OpenServer 5.0.6 /etc/ftpd
OpenServer 5.0.7 /etc/ftpd
3. Solution
The proper solution is to install the latest packages.
4. OpenServer 5.0.6
4.1 First install oss646b 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 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.6
4.5 Verification
MD5 (VOL.000.000) = 713bab43a71937e8d9ab015de1335a26
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.6 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
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.6
The fixes are also available in SCO OpenServer Release 5.0.7
Maintenance Pack 3 or later. See
http://www.sco.com/support/update/download/osr507list.html.
5.2 Verification
MD5 (VOL.000.000) = 713bab43a71937e8d9ab015de1335a26
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
5.3 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.
6. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0148
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 sr889579 fz528958
erg712568.
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.
8. Acknowledgments
SCO would like to thank Glenn Stewart
______________________________________________________________________________
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