Date: Thu, 18 Feb 1999 01:30:35 +0100
From: "Anthony C . Zboralski" <[email protected]>
To: [email protected]Subject: [HERT] Advisory #002 Buffer overflow in lsof
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HERT - Hacker Emergency Response Team
[email protected] - http://www.hert.org
Advisory: #00002
Title: lsof
Date: 17 February 1999
Summary: Buffer overflow in lsof version 4.40 and prior
IMPACT: Local users may obtain root priviledge.
Author: Mariusz Tmoggie Marcinkiewicz <[email protected]>
Test Exploit: [email protected]
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Copyright (C) 1999 Hacker Emergency Response Team
Permission is granted to reproduce and distribute HERT advisories in their
entirety, provided the HERT PGP signature is included and provided the alert is used for noncommercial purposes and with the intent of increasing the aware-
ness of the Internet community.
This advisory is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
1. Background:
lsof - list open files
Lsof lists information about files opened by processes for most
UNIX dialects.
When lsof is setuid-root or setgid kmem, it is vulnerable to a buffer
overflow that will lead to direct root compromise or root compromise
thru live kernel patching.
The paradox is that lsof is a great security tool for administrators and
we encourage its uses as long as it is NOT setuid-root or setgid.
Test exploit code for this vulnerability was developped by [email protected]
and will be made available to lsof author, HERT collaborators, sponsors
and partners.
2. Distributions known to be affected.
OpenBSD 2.4's ports facility retrieves and builds lsof package setgid kmem.
FreeBSD's ports facility retrieves and builds lsof package setgid kmem.
SuSe Linux ships lsof setgid kmem.
Debian GNU/Linux 2.0 ships lsof setgid kmem.
Redhat Linux 5.2 ships lsof setgid kmem.
3. Recommendations
Fix:
chmod 0755 lsof
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