[UNIX] Neon Format String Vulnerabilities
From: SecuriTeam (support_at_securiteam.com)
Date: 04/18/04
- Previous message: SecuriTeam: "[UNIX] Squirrelmail Change_passwd Buffer Overflow"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
To: list@securiteam.com Date: 18 Apr 2004 14:02:26 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
The SecuriTeam alerts list - Free, Accurate, Independent.
Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html
- - - - - - - - -
Neon Format String Vulnerabilities
------------------------------------------------------------------------
SUMMARY
void.at has discovered a format string vulnerability in
<http://www.webdav.org/neon> neon. neon is "a WebDAV client library, used
by Subversion and others". A malicious WebDAV server sending a specially
crafted WebDAV response can exploit the vulnerability.
DETAILS
Vulnerable Systems:
* neon version 0.24.4 and prior
Immune Systems:
* neon version 0.24.5 and newer
One particular bug is that if the response of the web server 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="http://apache.org/dav/props/">
<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:stat>
Impact:
Middle. Man-in-the-middle-attack or fake server needed. Note that all
clients using this library (such as Subversion) are affected.
Solution:
neon 0.24.5 fixes the described problem. You can get it from
<http://www.webdav.org/neon/neon-0.24.5.tar.gz>
http://www.webdav.org/neon/neon-0.24.5.tar.gz.
Discovery 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
ADDITIONAL INFORMATION
The information has been provided by <mailto:greuff@void.at> Thomas Wana.
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@securiteam.com
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
- Previous message: SecuriTeam: "[UNIX] Squirrelmail Change_passwd Buffer Overflow"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
Relevant Pages
|
|
