Bug 461750 - (CVE-2008-4677) CVE-2008-4677 vim: netrw plugin: FTP username and password disclosure
CVE-2008-4677 vim: netrw plugin: FTP username and password disclosure
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
reported=20080813,public=20080812,sou...
: Security
Depends On:
Blocks:
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Reported: 2008-09-10 08:36 EDT by Jan Lieskovsky
Modified: 2009-01-08 06:12 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2009-01-08 06:12:34 EST
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Description Jan Lieskovsky 2008-09-10 08:36:54 EDT
Description of problem (pasted from original rdancer.org vim vulnerability
description -- see references):

The Vim Netrw Plugin shares the FTP user name and password across all
FTP sessions.  Every time Vim makes a new FTP connection, it sends the
user name and password of the previous FTP session to the FTP server.

Once vim successfully connects to an FTP server using a user name and
password credentials, it will re-use them in all subsequent FTP
sessions, regardless of the domain name or TCP port.

This behaviour is documented, although the documentation states the
credentials are ``retained on a per-session basis''.  Apparently the Vim
session, not the FTP session:

  ``g:netrw_uid      (ftp) user-id,    retained on a per-session basis
    s:netrw_passwd   (ftp) password,   retained on a per-session basis''

    		-- Netrw Reference Manual (``pi_netrw.txt'')

Although FTP communication is not encrypted and therefore open to
eavesdropping, if the access to the network is protected, a
credentials-based access control is meaningful, and the credentials must
be kept secret.

Version-Release number of selected component (if applicable):
7.1.266, 7.2 and earlier versions of Vim

How reproducible:
Always

Steps to Reproduce:
1. See "4. EXPLOIT" from the rdancer vim vulnerability report [1]
  
Actual results:
Credentials disclosure.

Expected results:
Credentials are kept secret.

References (rdancer.org vim original vulnerability report):

[1] http://www.rdancer.org/vulnerablevim-netrw-credentials-dis.html
Comment 2 Tomas Hoger 2009-01-08 06:12:34 EST
This issue did not affect the versions of vim as shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5. 

All stable Fedora versions were updated to vim upstream version 7.2.060, which contains netrw plugin version that prompts for new password when connecting to new FTP site.  Update requests:
  https://admin.fedoraproject.org/updates/F9/FEDORA-2008-10587
  https://admin.fedoraproject.org/updates/F10/FEDORA-2008-10644

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