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Category:   Application (Web Server/CGI)  >   ht//Dig Vendors:   ht//Dig Group
(Red Hat Issues Fix) ht://Dig Search Engine Software Has Remote Denial of Service and Local Information Disclosure Bugs in htsearch
SecurityTracker Alert ID:  1002710
SecurityTracker URL:  http://securitytracker.com/id/1002710
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 8 2001
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.1.0b2 and more recent, including 3.1.5 and 3.2.0b3
Description:   A vulnerability was reported in the ht://Dig htsearch search engine CGI software that allows remote users to conduct denial of service attacks against the search engine. It also users who can place a special control file on the system to retrieve files from the server.

It is reported that htsearch accepts a -c [filename] option to read in an alternate configuration file. A remote user can specify this command line argument to cause the CGI to stall until it times out or cause it to read in another configuration file.

If a local user places an alternate configuration file on the system, a remote user may then be able to remotely view files on the system that are readable by the web server.

The following type of URLs can be used to trigger this vulnerability:

http://[targethost]/cgi-bin/htsearch?-c/dev/zero
http://[targethost]/cgi-bin/htsearch?-c/path/to/my.file

Impact:   A remote user can cause a denial of service condition. If a local user can place an alternate configuration file on the system (via FTP or Samba or some other means not related to htsearch) and that configuration file is readable by the web server, then a remote user can view files on the system that are readable by the web server.
Solution:   The vendor has released a fix:

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/htdig-3.2.0-1.b4.0.71.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/htdig-3.2.0-1.b4.0.71.alpha.rpm
ftp://updates.redhat.com/7.1/en/os/alpha/htdig-web-3.2.0-1.b4.0.71.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/htdig-3.2.0-1.b4.0.71.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/htdig-web-3.2.0-1.b4.0.71.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/htdig-3.2.0-1.b4.0.71.ia64.rpm
ftp://updates.redhat.com/7.1/en/os/ia64/htdig-web-3.2.0-1.b4.0.71.ia64.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/htdig-3.2.0-1.b4.0.72.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/htdig-3.2.0-1.b4.0.72.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/htdig-web-3.2.0-1.b4.0.72.i386.rpm

The verification checksums are:

MD5 sum Package Name
--------------------------------------------------------------------------
e57927bdae66d7f8397b103512d5dcf5 7.1/en/os/SRPMS/htdig-3.2.0-1.b4.0.71.src.rpm
b8aea64d8b726ff55182b2103eed27ca 7.1/en/os/alpha/htdig-3.2.0-1.b4.0.71.alpha.rpm
3d993553d7fa3ef09bff27f30d4474b4 7.1/en/os/alpha/htdig-web-3.2.0-1.b4.0.71.alpha.rpm
401c973167c03355db256631bcdb8404 7.1/en/os/i386/htdig-3.2.0-1.b4.0.71.i386.rpm
2a13e4bd789fa9972881b91ffb6bb115 7.1/en/os/i386/htdig-web-3.2.0-1.b4.0.71.i386.rpm
828fb19b81834846be4231cca3898b67 7.1/en/os/ia64/htdig-3.2.0-1.b4.0.71.ia64.rpm
3b59daa57a07c8f2d8015024f6ef3e21 7.1/en/os/ia64/htdig-web-3.2.0-1.b4.0.71.ia64.rpm
0bc42b142d9b6e222b6a7fd9b9368a14 7.2/en/os/SRPMS/htdig-3.2.0-1.b4.0.72.src.rpm
cc39ed5832f5bdbc0bdcc9c3e7c0f369 7.2/en/os/i386/htdig-3.2.0-1.b4.0.72.i386.rpm
b1ea38d03376fbad2204a49d28ec095a 7.2/en/os/i386/htdig-web-3.2.0-1.b4.0.72.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security. The GPG key is available at:
http://www.redhat.com/about/contact/pgpkey.html

You can verify each package with the following command:
rpm --checksig <filename>

If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command:
rpm --checksig --nogpg <filename>

See the Source Message for the vendor's advisory containing directions on how to apply the appropriate fix.

Vendor URL:  www.htdig.org/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Oct 11 2001 ht://Dig Search Engine Software Has Remote Denial of Service and Local Information Disclosure Bugs in htsearch



 Source Message Contents

Subject:  [RHSA-2001:139-04] Updated htdig packages are available


---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated htdig packages are available
Advisory ID:       RHSA-2001:139-04
Issue date:        2001-10-24
Updated on:        2001-10-30
Product:           Red Hat Linux
Keywords:          htdig CGI htsearch DOS configuration file -c switch security
Cross references:  http://www.securityspace.com/smysecure/catid.html?id=10784
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

Updated ht://dig packages fix a DOS attack and a potential (yet unlikely)
security problem.

2. Relevant releases/architectures:

Red Hat Linux 7.1 - alpha, i386, ia64

Red Hat Linux 7.2 - i386

3. Problem description:

In the previous version, the htsearch CGI script used to accept the -c
switch remotely--asking htdig to use a different configuration file. The
update removes this potential exploit.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):



6. RPMs required:

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/htdig-3.2.0-1.b4.0.71.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/htdig-3.2.0-1.b4.0.71.alpha.rpm
ftp://updates.redhat.com/7.1/en/os/alpha/htdig-web-3.2.0-1.b4.0.71.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/htdig-3.2.0-1.b4.0.71.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/htdig-web-3.2.0-1.b4.0.71.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/htdig-3.2.0-1.b4.0.71.ia64.rpm
ftp://updates.redhat.com/7.1/en/os/ia64/htdig-web-3.2.0-1.b4.0.71.ia64.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/htdig-3.2.0-1.b4.0.72.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/htdig-3.2.0-1.b4.0.72.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/htdig-web-3.2.0-1.b4.0.72.i386.rpm



7. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
e57927bdae66d7f8397b103512d5dcf5 7.1/en/os/SRPMS/htdig-3.2.0-1.b4.0.71.src.rpm
b8aea64d8b726ff55182b2103eed27ca 7.1/en/os/alpha/htdig-3.2.0-1.b4.0.71.alpha.rpm
3d993553d7fa3ef09bff27f30d4474b4 7.1/en/os/alpha/htdig-web-3.2.0-1.b4.0.71.alpha.rpm
401c973167c03355db256631bcdb8404 7.1/en/os/i386/htdig-3.2.0-1.b4.0.71.i386.rpm
2a13e4bd789fa9972881b91ffb6bb115 7.1/en/os/i386/htdig-web-3.2.0-1.b4.0.71.i386.rpm
828fb19b81834846be4231cca3898b67 7.1/en/os/ia64/htdig-3.2.0-1.b4.0.71.ia64.rpm
3b59daa57a07c8f2d8015024f6ef3e21 7.1/en/os/ia64/htdig-web-3.2.0-1.b4.0.71.ia64.rpm
0bc42b142d9b6e222b6a7fd9b9368a14 7.2/en/os/SRPMS/htdig-3.2.0-1.b4.0.72.src.rpm
cc39ed5832f5bdbc0bdcc9c3e7c0f369 7.2/en/os/i386/htdig-3.2.0-1.b4.0.72.i386.rpm
b1ea38d03376fbad2204a49d28ec095a 7.2/en/os/i386/htdig-web-3.2.0-1.b4.0.72.i386.rpm 

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/about/contact/pgpkey.html

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:




Copyright(c) 2000, 2001 Red Hat, Inc.



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