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Category:   Application (Web Server/CGI)  >   ht//Dig Vendors:   ht//Dig Group
(Debian Issues Fix) ht://Dig Search Engine Software Has Remote Denial of Service and Local Information Disclosure Bugs in htsearch
SecurityTracker Alert ID:  1002563
SecurityTracker URL:  http://securitytracker.com/id/1002563
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 17 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 in version of 3.1.5-2.1 for Debian GNU/Linux 2.2:

If you are using the apt-get package manager, use the line for sources.list as given below:

apt-get update
will update the internal database
apt-get upgrade
will install corrected packages

You may use an automated update by adding the resources from the footer to the proper configuration.

Debian GNU/Linux 2.2 alias potato
- ------------------------------------

Source archives:
http://security.debian.org/dists/stable/updates/main/source/htdig_3.1.5-2.0potato.1.diff.gz
MD5 checksum: 4ad4dc342e31db65127cc58a8063f025
http://security.debian.org/dists/stable/updates/main/source/htdig_3.1.5-2.0potato.1.dsc
MD5 checksum: e59bfe00133e97ae7f071d3a8510eb35
http://security.debian.org/dists/stable/updates/main/source/htdig_3.1.5.orig.tar.gz
MD5 checksum: cbf4a0f2b703d9822db555a14dc96ed3

Architecture independent components:

http://security.debian.org/dists/stable/updates/main/binary-all/htdig-doc_3.1.5-2.0potato.1_all.deb
MD5 checksum: 6c5c94f56ce3e02018864439bb24ac18

Alpha architecture:

http://security.debian.org/dists/stable/updates/main/binary-alpha/htdig_3.1.5-2.0potato.1_alpha.deb
MD5 checksum: 412501d347af74566b170f5e485216c4

ARM architecture:

http://security.debian.org/dists/stable/updates/main/binary-arm/htdig_3.1.5-2.0potato.1_arm.deb
MD5 checksum: 35e60b98022364b61be3d3c23b300782

Intel ia32 architecture:

http://security.debian.org/dists/stable/updates/main/binary-i386/htdig_3.1.5-2.0potato.1_i386.deb
MD5 checksum: 77befd19641a294cb0a47b72aa15e91c

Motorola 680x0 architecture:

http://security.debian.org/dists/stable/updates/main/binary-m68k/htdig_3.1.5-2.0potato.1_m68k.deb
MD5 checksum: 5dc1c696e9dcc86af834546201efec79

PowerPC architecture:

http://security.debian.org/dists/stable/updates/main/binary-powerpc/htdig_3.1.5-2.0potato.1_powerpc.deb
MD5 checksum: 30a2cd56b561cf481bf4cdc595cda7ad

Sun Sparc architecture:

http://security.debian.org/dists/stable/updates/main/binary-sparc/htdig_3.1.5-2.0potato.1_sparc.deb
MD5 checksum: ce101a18a7af6e6dde43bf2c0ec330b1

Debian reports that these files will be moved into the stable distribution on its next revision.

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

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

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:  [SECURITY] [DSA 080-1] New ht://Dig packages fix vulnerability


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ----------------------------------------------------------------------------
Debian Security Advisory DSA 080-1                       security@debian.org
http://www.debian.org/security/                               Martin Schulze
October 17th, 2001
- ----------------------------------------------------------------------------

Package        : htdig
Vulnerability  : unauthorized gathering of data
Problem-Type   : remote DoS, local information retrieval
Debian-specific: no

Nergal reported a vulnerability in the htsearch program which is
distributed as part of the ht://Dig package, a indexing and searching
system for small domains or intranets.  Using former versions it was
able to pass the parameter `-c' to the cgi program in order to use a
different configuration file.

A malicious user could point htsearch to a file like `/dev/zero' and
let the server run in an endless loop, trying to read config
parameters.  If the user has write permission on the server he can
point the program to it and retrive any file readable by the webserver
user id.

This problem has been fixed in version of 3.1.5-2.1 for Debian
GNU/Linux 2.2.

We recommend that you upgrade your htdig package immediately.

wget url
	will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 2.2 alias potato
- ------------------------------------

  Source archives:

    http://security.debian.org/dists/stable/updates/main/source/htdig_3.1.5-2.0potato.1.diff.gz
      MD5 checksum: 4ad4dc342e31db65127cc58a8063f025
    http://security.debian.org/dists/stable/updates/main/source/htdig_3.1.5-2.0potato.1.dsc
      MD5 checksum: e59bfe00133e97ae7f071d3a8510eb35
    http://security.debian.org/dists/stable/updates/main/source/htdig_3.1.5.orig.tar.gz
      MD5 checksum: cbf4a0f2b703d9822db555a14dc96ed3

  Architecture independent components:

    http://security.debian.org/dists/stable/updates/main/binary-all/htdig-doc_3.1.5-2.0potato.1_all.deb
      MD5 checksum: 6c5c94f56ce3e02018864439bb24ac18

  Alpha architecture:

    http://security.debian.org/dists/stable/updates/main/binary-alpha/htdig_3.1.5-2.0potato.1_alpha.deb
      MD5 checksum: 412501d347af74566b170f5e485216c4

  ARM architecture:

    http://security.debian.org/dists/stable/updates/main/binary-arm/htdig_3.1.5-2.0potato.1_arm.deb
      MD5 checksum: 35e60b98022364b61be3d3c23b300782

  Intel ia32 architecture:

    http://security.debian.org/dists/stable/updates/main/binary-i386/htdig_3.1.5-2.0potato.1_i386.deb
      MD5 checksum: 77befd19641a294cb0a47b72aa15e91c

  Motorola 680x0 architecture:

    http://security.debian.org/dists/stable/updates/main/binary-m68k/htdig_3.1.5-2.0potato.1_m68k.deb
      MD5 checksum: 5dc1c696e9dcc86af834546201efec79

  PowerPC architecture:

    http://security.debian.org/dists/stable/updates/main/binary-powerpc/htdig_3.1.5-2.0potato.1_powerpc.deb
      MD5 checksum: 30a2cd56b561cf481bf4cdc595cda7ad

  Sun Sparc architecture:

    http://security.debian.org/dists/stable/updates/main/binary-sparc/htdig_3.1.5-2.0potato.1_sparc.deb
      MD5 checksum: ce101a18a7af6e6dde43bf2c0ec330b1


  These files will be moved into the stable distribution on its next
  revision.

- ----------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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Comment: For info see http://www.gnupg.org

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