(Engarde Issues Fix) Apache Web Server Virtual Hosting Split-Logfile Function Lets Remote Users Write Log Entries to Arbitrary Files on the System
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SecurityTracker Alert ID: 1002590 |
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SecurityTracker URL: http://securitytracker.com/id/1002590
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CVE Reference:
CAN-2001-0730
(Links to External Site)
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Date: Oct 20 2001
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Impact:
Modification of system information, Modification of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 1.3.20; possibly earlier versions
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Description:
A vulnerability was reported in the Apache web server. Under a certain configuration, a remote user can cause a log file entry to be appended to any file on the system that is writable by the web server.
If the Apache server is configured to support virtual hosts and uses split-logfiles to separate the log file by host name, the vulnerability can be triggered.
A remote user can specify "/" as the HTTP 'Host:' field to cause an error to occur and a line to be added to any file in the filesystem that is writable by the web server's split-logfile process:
GET / HTTP/1.0
Host: /
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Impact:
A remote user can cause a log file entry to be written to any file on the system thta is writable by the split-logfile process.
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Solution:
The vendor has released a fix. EnGarde recommends that all users upgrade to the most recent version. EnGarde users can automatically update their system using the Guardian Digital WebTool secure interface. If manually upgrading, updates can be obtained from:
ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
http://ftp.engardelinux.org/pub/engarde/stable/updates/
See the Source Message for certain requirements before upgrading.
The following updated packages are for EnGarde Secure Linux 1.0.1 (Finestra):
Source Packages:
SRPMS/apache-1.3.22-1.0.26.src.rpm
MD5 Sum: 181b1b14d60b3e9268fdc979ac0b3c98
Binary Packages:
i386/apache-1.3.22-1.0.26.i386.rpm
MD5 Sum: 96572199eee00807d35b8c78d1fcc011
i686/apache-1.3.22-1.0.26.i686.rpm
MD5 Sum: 17a01bce42ad8d34ec4e87ef2949fc90
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Vendor URL: www.apache.org/ (Links to External Site)
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Cause:
Input validation error, State error
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Underlying OS:
Linux (EnGarde)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Fri, 19 Oct 2001 12:16:02 -0400 (EDT)
Subject: [ESA-20011019-01] Two apache vulnerabilities
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
+------------------------------------------------------------------------+
| EnGarde Secure Linux Security Advisory October 19, 2001 |
| http://www.engardelinux.org/ ESA-20011019-01 |
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| Package: apache |
| Summary: Two apache vulnerabilities |
+------------------------------------------------------------------------+
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 are two vulnerabilities in apache which can allow an
attacker to write to arbitrary files or view directory indexes when
they are not supposed to, in some configurations.
DETAIL
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The following items are from the "Announcement" file included in the
Apache 1.3.22 tarball:
* A vulnerability was found in the split-logfile support program. A
request with a specially crafted Host: header could allow any file
with a .log extension on the system to be written to. PR#7848
CAN-2001-0730
* A vulnerability was found when Multiviews are used to negotiate
the directory index. In some configurations, requesting a URI with
a QUERY_STRING of M=D could return a directory listing rather than
the expected index page. CAN-2001-0731
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the names CAN-2001-0730 and CAN-2001-0731 to these issues.
SOLUTION
- --------
All users should upgrade to the most recent version, as outlined in
this advisory.
Guardian Digital recently made available the Guardian Digital Secure
Update, a means to proactively keep systems secure and manage
system software. EnGarde users can automatically update their system
using the Guardian Digital WebTool secure interface.
If choosing to manually upgrade this package, updates can 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>
To re-enable LIDS (if it was disabled), execute the command:
# /sbin/lidsadm -S -- +LIDS_GLOBAL
To verify the signature of the updated packages, execute the command:
# rpm -Kv <filename>
UPDATED PACKAGES
- ----------------
These updated packages are for EnGarde Secure Linux 1.0.1 (Finestra).
Source Packages:
SRPMS/apache-1.3.22-1.0.26.src.rpm
MD5 Sum: 181b1b14d60b3e9268fdc979ac0b3c98
Binary Packages:
i386/apache-1.3.22-1.0.26.i386.rpm
MD5 Sum: 96572199eee00807d35b8c78d1fcc011
i686/apache-1.3.22-1.0.26.i686.rpm
MD5 Sum: 17a01bce42ad8d34ec4e87ef2949fc90
REFERENCES
- ----------
Guardian Digital's public key:
http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY
Apache's Official Web Site:
http://httpd.apache.org/
Security Contact: security@guardiandigital.com
EnGarde Advisories: http://www.engardelinux.org/advisories.html
- --------------------------------------------------------------------------
$Id: ESA-20011019-01-apache,v 1.1 2001/10/18 20:09:53 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple, <ryan@guardiandigital.com>
Copyright 2001, Guardian Digital, Inc.
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------------------------------------------------------------------------
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with "unsubscribe" in the subject of the message.
Copyright(c) 2001 Guardian Digital, Inc. EnGardeLinux.org
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