oss-security - CVE request:Lynx invalid URL parsing with '?'

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date: Thu, 3 Nov 2016 17:58:14 +0800
From: redrain root <rootredrain@...il.com>
To: dickey@...isible-island.net, oss-security@...ts.openwall.com, 
	fulldisclosure@...lists.org
Cc: cve-assign@...re.org
Subject: CVE request:Lynx invalid URL parsing with '?'

I can't find any bugtracker in lynx ,so i will disclose by this mail and
sent to the author dickey@...isible-island.net.

redrain (rootredrain@...il.com)
Date:2016-11-03
Version: 2.8.8pre.4、2.8.9dev.8 and earlier
Platform: Linux and Windows
Vendor: http://lynx.browser.org/
Vendor Notified: 2016-11-03

VULNERABILITY
-------------------------

Lynx doesn't parse the authority component of the URL correctly when the
host
name part ends with '?', and could instead be tricked into
connecting to a different host.

Passing in `*http://google.com?@...kdog.me/
<http://google.com?@...kdog.me/>*` <http://example.com/#@evil.com/x.txt> would
wrongly make lynx send a
request to hackdog.me while your browser would connect to google.com given
the same URL.

PoC
------------------------
lynx  "http://google.com?@...kdog.me/"

SOLUTION
-------------------------
follow the RFC and check for domains before send request.

Regards,
redrain

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.