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
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.
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.
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.
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:
Integrated into Perl 5.8.x maintenance branch as part of:
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
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.
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