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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0253 -- iDEFENSE Security Advisory 04.05.04 Perl win32_stat Function Buffer Overflow Vulnerability 06 April 2004 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Perl 5.8.3 and prior Publisher: iDEFENSE Operating System: Windows Impact: Execute Arbitrary Code/Commands Access Required: Remote CVE Names: CAN-2004-0377 - --------------------------BEGIN INCLUDED TEXT-------------------- Perl win32_stat Function Buffer Overflow Vulnerability iDEFENSE Security Advisory 04.05.04 www.idefense.com/application/poi/display?id=93&type=vulnerabilities April 5, 2004 I. BACKGROUND Perl is a popular programming language due to its text manipulation capabilities and rapid development cycle. It is open source, cross platform and used for mission critical projects in the public and private sector. II. DESCRIPTION Remote exploitation of a buffer overflow in the 'win32_stat' function of ActiveState's ActivePerl and Larry Wall's Perl could allow for the execution of arbitrary commands. If the filename passed to the function ends with a backslash character, it is copied into a fixed length buffer. There is no check made on the length of the string before the copy, allowing an excessively long string to overwrite control information, allowing execution of arbitrary code. The problem specifically exists within the win32 wrapper to the stat() routine and hence the Unix builds of Perl are not affected. III. ANALYSIS The 'win32_stat' function is a wrapper around the 'stat' function and the file test operators ('-r', '-w', '-e', '-d' etc) on Win32 based platforms. If a web site contains a Perl script that uses any of these functions with user supplied pathnames, it may be possible to remotely execute commands. IV. DETECTION All versions of Perl for Win32 operating systems up to and including 5.8.3 are affected. V. VENDOR RESPONSE The fix will be incorporated into core Perl 5.8.4. Patches are currently available at the following locations: Committed to the Perl 5.9.x development branch: http://public.activestate.com/cgi-bin/perlbrowse?patch=22466 Integrated into Perl 5.8.x maintenance branch as part of: http://public.activestate.com/cgi-bin/perlbrowse?patch=22552 VI. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2004-0377 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VII. DISCLOSURE TIMELINE January 09, 2004 Vulnerability discovered by iDEFENSE February 25, 2004 Initial vendor contact February 26, 2004 iDEFENSE clients notified February 26, 2004 Vendor response April 05, 2004 Public disclosure VIII. CREDIT Greg MacManus (iDEFENSE Labs) is credited with this discovery. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp IX. LEGAL NOTICES Copyright (c) 2004 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email email@example.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to firstname.lastname@example.org and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: email@example.com Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQHICSyh9+71yA2DNAQI6hQP/bYKp3D09iVZKWXnALYPBvc31IO1WomZQ xX0Z640EZo0JHf78E+We8xJOFesRkEody6WvsKKstxOzokywroS2FHJoaSOM0u+G flhBPf7ADHhtYkR1zAnLy/oDGd1PzMqkE+QAV7RxX222g78bS//Oi+j9SZrbTLpO RUsIHw/WB74= =7yYL -----END PGP SIGNATURE-----