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Date: Mon, 28 May 2001 11:46:13 +0200 (CEST)
From: dethy <dethy@synnergy.net>
To: bugtraq@securityfocus.com
Subject: [synnergy] - Solaris mailtool(1) buffer overflow vulnerability
Vulnerability in Solaris mailtool(1)
Date Published: May 29, 2001
Advisory ID: N/A
Bugtraq ID: N/A
Sun Bug ID: 4458476
CVE CAN: Non currently assigned.
Title: Solaris mailtool(1) Buffer Overflow Vulnerability
Class: Boundary Error Condition
Remotely Exploitable: No
Locally Exploitable: Yes
Vulnerable Packages/Systems:
Solaris 8 x86
Solaris 8 sparc
[possibly others]
Discovery: dethy@synnergy.net
Synopsis:
The mailtool program is installed setgid mail by default in Solaris,
a buffer overrun exists in the OPENWINHOME environment variable. By
specifying a long environment buffer containing machine executable code,
it is possible to execute arbitrary command(s) as gid mail.
Analysis:
The vulnerability in mailtool incorrectly handles data from the
OPENWINHOME environment variable, if this variable exceeds a predefined
length a stack overflow can occur.
bash-2.03# export OPENWINHOME=`perl -e 'print "A"x1010'`
bash-2.03# mailtool
Segmentation Fault
`truss` output:
Incurred fault #6, FLTBOUNDS %pc = 0xDF8BD448
siginfo: SIGSEGV SEGV_MAPERR addr=0x4141414D
Received signal #11, SIGSEGV [default]
siginfo: SIGSEGV SEGV_MAPERR addr=0x4141414D
*** process killed ***
Quick Fix:
Clear the sgid bit off the /usr/openwin/bin/mailtool program.
chmod -s `which mailtool`
Solution/Vendor:
Sun Microsystems was notified on May 14, 2001 and verified the
vulnerability. Patches/fixes are shortly to be released.
Related Links:
This vulnerability is unrelated to the Solaris 7/8 ximp40 shared library
overflow discovered earlier in the year:
http://www.securityfocus.com/archive/1/159586
Credits :
Vulnerability discovered by dethy (dethy@synnergy.net)
Synnergy Networks http://www.synnergy.net
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