[UNIX] Neon Format String Vulnerabilities
From: SecuriTeam (support_at_securiteam.com)
To: firstname.lastname@example.org Date: 18 Apr 2004 14:02:26 +0200
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Neon Format String Vulnerabilities
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.
* neon version 0.24.4 and prior
* 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
webdav-requests always start with PROPFIND:
PROPFIND /lenya/blog/authoring/entries/2003/08/24/peanuts/ HTTP/1.1
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
HTTP/1.1 207 Multi-Status
Set-Cookie: JSESSIONID=320E3B1395B867B5BC42B5FC93457C36; Path=/lenya
Date: Mon, 25 Aug 2003 14:27:12 GMT
Server: Apache Coyote/1.0
<?xml version="1.0" encoding="UTF-8"?>
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:status>HTTP/1.1 200 OK</D:status>
The formatstring bug can be triggered with a response like:
Middle. Man-in-the-middle-attack or fake server needed. Note that all
clients using this library (such as Subversion) are affected.
2004-03-10: Bug discovered
2004-03-15: Contacted email@example.com (maintainer)
2004-03-16: Maintainer confirmation
2004-04-14: Maintainer released fixed version 0.24.5
2004-04-16: Public disclosure
The information has been provided by <mailto:firstname.lastname@example.org> Thomas Wana.
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