Date: Mon, 29 Apr 2002 08:53:29 -0400 (EDT)
From: EnGarde Secure Linux <[email protected]>
To: [email protected], [email protected]Subject: [ESA-20020429-010] 'sudo' heap corruption vulnerability
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| EnGarde Secure Linux Security Advisory April 29, 2002 |
| http://www.engardelinux.org/ ESA-20020429-010 |
| |
| Package: sudo |
| Summary: sudo heap corruption vulnerability. |
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EnGarde Secure Linux is a secure distribution of Linux that features
improved access control, host and network intrusion detection, Web
based secure remote management, complete e-commerce using AllCommerce,
and integrated open source security tools.
OVERVIEW
- --------
There is a heap corruption vulnerability in sudo which may allow an
attacker to execute arbitrary commands.
DETAIL
- ------
sudo allows a permitted user to execute a command as the superuser or
another user, as specified in the sudoers file. It takes a -p argument
which allows the user to specify a custom password prompt.
The user is permitted to use %u and %h macros which are expanded to
their username and the systems hostname. When parsing the argument to
-p sudo will malloc() memory for the string that is to become the
password prompt.
By using a specially crafted argument the user may trick sudo into
allocating less memory then it should for this prompt. If sudo was
compiled with PAM support (which it is in most Linux distributions) the
user may corrupt the heap and execute arbitrary commands.
SOLUTION
- --------
Users of the EnGarde Professional edition can use the Guardian Digital
Secure Network to update their systems automatically.
EnGarde Community users should upgrade to the most recent version
as outlined in this advisory. Updates may be obtained from:
ftp://ftp.engardelinux.org/pub/engarde/stable/updates/http://ftp.engardelinux.org/pub/engarde/stable/updates/
Before upgrading the package, the machine must either:
a) be booted into a "standard" kernel; or
b) have LIDS disabled.
To disable LIDS, execute the command:
# /sbin/lidsadm -S -- -LIDS_GLOBAL
To install the updated package, execute the command:
# rpm -Uvh <filename>
You must now update the LIDS configuration by executing the command:
# /usr/sbin/config_lids.pl
To re-enable LIDS (if it was disabled), execute the command:
# /sbin/lidsadm -S -- +LIDS_GLOBAL
To verify the signatures of the updated packages, execute the command:
# rpm -Kv <filename>
UPDATED PACKAGES
- ----------------
These updated packages are for EnGarde Secure Linux Community
Edition.
Source Packages:
SRPMS/sudo-1.6.4-1.0.7.src.rpm
MD5 Sum: 75db702281fec73962968f099e1a959c
Binary Packages:
i386/sudo-1.6.4-1.0.7.i386.rpm
MD5 Sum: 0ecafa8dd05315772afa7e77f7089d69
i686/sudo-1.6.4-1.0.7.i686.rpm
MD5 Sum: a267c880a9e0093e4e13d140898756cc
REFERENCES
- ----------
Guardian Digital's public key:
http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY
Credit for the discovery of this bug goes to:
fc, with research/coordination by Global InterSec
sudo's Official Web Site:
http://www.sudo.ws/
Security Contact: [email protected]
EnGarde Advisories: http://www.engardelinux.org/advisories.html
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$Id: ESA-20020429-010-sudo,v 1.2 2002/04/29 12:45:39 rwm Exp $
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Author: Ryan W. Maple, <[email protected]>
Copyright 2002, Guardian Digital, Inc.
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