Twenty Year Anniversary

vsa0401.html

vsa0401.html
Posted Apr 18, 2004
Authored by Thomas Wana

Format string bugs exist in neon versions 0.19.0 and below when ne_set_error is changed from taking a single char to taking printf-style varargs. Release 0.24.5 fixes this problem.

tags | advisory
advisories | CVE-2004-0179
MD5 | 0a4d0dfaacf028ef49eca840e05f46f6

vsa0401.html

Change Mirror Download
<pre>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

[VSA0401 - neon - void.at security notice]

Overview
========

We have discovered a format string vulnerability in neon
(http://www.webdav.org/neon). neon is a webdav client
library, used by Subversion and others.

CVE has assigned the name CAN-2004-0179 to this issue.

Affected Versions
=================

This affects neon versions 0.19.0 onwards when ne_set_error
was changed from taking a single char* to taking printf-style
varargs.

Impact
======

Middle. Man-in-the-middle-attack or fake server needed. Note
that all clients using this library (such as Subversion) are
affected.

Workaround:
===========

neon 0.24.5 fixes the described problem. You can get it from
http://www.webdav.org/neon/neon-0.24.5.tar.gz.

Details
=======

grep for ne_set_error and see for yourself.
One particular bug is that if the response of the webserver
doesn't start with "HTTP", it is considered invalid and will
be logged via ne_set_error. You can supply %08x%08x etc there
and it will be executed by a libc format function.

webdav-requests always start with PROPFIND:

Request
- -------

PROPFIND /lenya/blog/authoring/entries/2003/08/24/peanuts/ HTTP/1.1
Pragma: no-cache
Cache-control: no-cache
Accept: text/*, image/jpeg, image/png, image/*, */*
Accept-Encoding: x-gzip, gzip, identity
Accept-Charset: iso-8859-1, utf-8;q=0.5, *;q=0.5
Accept-Language: en
Host: 127.0.0.1
Depth: 0

Response
- --------

HTTP/1.1 207 Multi-Status
X-Cocoon-Version: 2.1
Set-Cookie: JSESSIONID=320E3B1395B867B5BC42B5FC93457C36; Path=/lenya
Content-Type: text/xml
Transfer-Encoding: chunked
Date: Mon, 25 Aug 2003 14:27:12 GMT
Server: Apache Coyote/1.0


<?xml version="1.0" encoding="UTF-8"?>
<D:multistatus xmlns:D="DAV:">

<D:response xmlns:lp1="DAV:" xmlns:lp2="<a href="http://apache.org/dav/props/&quot">http://apache.org/dav/props/&quot</a>;>
<D:href>/lenya/blog/authoring/entries/2003/08/24/peanuts/</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>

</D:multistatus>

The formatstring bug can be triggered with a response like:
...
<D:status>%08x%08x</D:status>
...

Timeline
========

2004-03-10: Bug discovered
2004-03-15: Contacted jorton@redhat.com (maintainer)
2004-03-16: Maintainer confirmation
2004-04-14: Maintainer released fixed version 0.24.5
2004-04-16: Public disclosure

Discovered by
=============

Thomas Wana <greuff@void.at>

Credits
=======

void.at
Joe Orton (neon maintainer)
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iD8DBQFAgCWNLd3EzkyJNR8RAg0vAJ9y1Go4v5beg1haBez2UNB+59WuMACbBqoE
OVS/aw8YTpuu97qqpLuahnk=
=TFIo
-----END PGP SIGNATURE-----
</pre>

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

Want To Donate?


Bitcoin: 18PFeCVLwpmaBuQqd5xAYZ8bZdvbyEWMmU

File Archive:

July 2018

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jul 1st
    1 Files
  • 2
    Jul 2nd
    26 Files
  • 3
    Jul 3rd
    15 Files
  • 4
    Jul 4th
    11 Files
  • 5
    Jul 5th
    13 Files
  • 6
    Jul 6th
    4 Files
  • 7
    Jul 7th
    4 Files
  • 8
    Jul 8th
    1 Files
  • 9
    Jul 9th
    16 Files
  • 10
    Jul 10th
    15 Files
  • 11
    Jul 11th
    32 Files
  • 12
    Jul 12th
    22 Files
  • 13
    Jul 13th
    15 Files
  • 14
    Jul 14th
    1 Files
  • 15
    Jul 15th
    1 Files
  • 16
    Jul 16th
    21 Files
  • 17
    Jul 17th
    15 Files
  • 18
    Jul 18th
    15 Files
  • 19
    Jul 19th
    17 Files
  • 20
    Jul 20th
    0 Files
  • 21
    Jul 21st
    0 Files
  • 22
    Jul 22nd
    0 Files
  • 23
    Jul 23rd
    0 Files
  • 24
    Jul 24th
    0 Files
  • 25
    Jul 25th
    0 Files
  • 26
    Jul 26th
    0 Files
  • 27
    Jul 27th
    0 Files
  • 28
    Jul 28th
    0 Files
  • 29
    Jul 29th
    0 Files
  • 30
    Jul 30th
    0 Files
  • 31
    Jul 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2018 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close