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Message-ID: <43C3CBAA.7040006@idefense.com> Date: Tue Jan 10 14:59:35 2006 From: labs-no-reply at idefense.com (labs-no-reply@...fense.com) Subject: iDefense Security Advisory 01.10.06: Sun Solaris uustat Buffer Overflow Vulnerability Sun Solaris uustat Buffer Overflow Vulnerability iDefense Security Advisory 01.10.06 http://www.idefense.com/intelligence/vulnerabilities/display.php?id=366 January 10, 2006 I. BACKGROUND The uustat binary (part of the uucp project) is used to display or cancel uucp requests as well as to provide general status on uucp connections to other systems. II. DESCRIPTION There exists a buffer overflow venerability in the /usr/bin/uustat binary in Sun Solaris 5.8 and 5.9. The uustat binary is installed setuid "uucp" by default on Solaris. The "-S" command line argument causes the binary to crash when followed with a string that is greater than or equal to 1152 bytes in length. The following shows the buffer being overflowed and then the o1 register being completely overwritten with the letter 'A': bash-2.03% ls -l /usr/bin/uustat ---s--x--x 1 uucp uucp 62012 Jan 17 16:07 uustat bash-2.03$ /usr/bin/uustat -S `perl -e 'print "A"x3000'` Segmentation Fault bash-2.03$ (gdb) info registers g0 0x0 0 g1 0xff315e98 -13541736 g2 0x1cc00 117760 g3 0x440 1088 g4 0x0 0 g5 0x0 0 g6 0x0 0 g7 0x0 0 o0 0xff3276a8 -13470040 o1 0x41414141 1094795585 ... III. ANALYSIS By exploiting this buffer overflow, an attacker can potentially gain control of the return address of the executing function, allowing arbitrary code execution with "uucp" privileges. IV. DETECTION Solaris 8 and 9 are running on SPARC and x86 architectures are vulnerable. V. WORKAROUND iDefense is currently unaware of any workarounds for this issue. VI. VENDOR RESPONSE The vendor has released the following advisory to address this issue: http://sunsolve.sun.com/search/document.do?assetkey=1-26-101933-1 VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2004-0780 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 08/11/2004 Initial vendor contact 08/11/2004 Initial vendor response 01/10/2006 Coordinated public disclosure IX. CREDIT Angelo Rosiello (http://www.rosiello.org) is credited with discovering this vulnerability. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp Free tools, research and upcoming events http://labs.idefense.com X. LEGAL NOTICES Copyright (c) 2006 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 customerservice@...fense.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.
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