OpenServer : UnZip File Permissions Change Vulnerability

2005.09.29
Risk: Medium
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 1.2/10
Impact Subscore: 2.9/10
Exploitability Subscore: 1.9/10
Exploit range: Local
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ________________________________________________________________________ ______ SCO Security Advisory Subject: OpenServer 5.0.7 OpenServer 6.0.0 : UnZip File Permissions Change Vulnerability Advisory number: SCOSA-2005.39 Issue date: 2005 September 28 Cross reference: sr894724 fz532853 erg712904 sr894723 fz532852 erg712905 CAN-2005-2475 ________________________________________________________________________ ______ 1. Problem Description A vulnerability in unzip can be exploited by malicious, local users to perform certain actions on a vulnerable system with escalated privileges. The vulnerability is caused due a race condition that exists when the uncompressed file is closed and before its permissions are changed. This can be exploited via hardlink attacks to change the permissions of other files belonging to the user running unzip. Successful exploitation requires that the malicious user is able to delete the uncompressed file and replace it with a hardlink to another file owned by the unzip user, before permissions are set on the file. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-2475 to this issue. 2. Vulnerable Supported Versions System Binaries ---------------------------------------------------------------------- OpenServer 5.0.7 unzip distribution OpenServer 6.0.0 unzip distribution 3. Solution The proper solution is to install the latest packages. 4. OpenServer 5.0.7 4.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.39/507 4.2 Verification MD5 (VOL.000.000) = d57b8a54b9547bef09ba1f25dbd2cbf1 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: 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 6.0.0 5.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.39/600 5.2 Verification MD5 (VOL.000.000) = f31e45c91c87409f487613fdc5c2fb01 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-2005-2475 http://marc.theaimsgroup.com/?l=bugtraq&m=112300046224117&w=2 http://www.securityfocus.com/bid/14450 http://www.osvdb.org/18530 http://secunia.com/advisories/16309 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 sr894724 fz532853 erg712904 sr894723 fz532852 erg712905. 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 Imran Ghory for discovering this weakness. ________________________________________________________________________ ______ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (UnixWare) iD8DBQFDOs1baqoBO7ipriERAlL6AJ42PH5zJVMpIwFFJW5/EaBFl1wLMACgmIV6 iU1iXNZQxpq86/Piz4bL2Bw= =j0qW -----END PGP SIGNATURE-----


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