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S-93-11.asc
Posted Jan 10, 2000

Subject wuarchive ftpd Vulnerability Date 11-Apr-93

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S-93-11.asc

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===============================================================================
>> CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl. Links <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>> <<
>> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the <<
>> complete CERT-CC advisory texts: http://www.cert.org <<
===============================================================================
===============================================================================
Security Advisory CERT-NL
===============================================================================
Author/Source : CERT-NL (Erik-Jan Bos) Index : S-93-11
Distribution : World Page : 1
Classification: External Version: Final
Subject : wuarchive ftpd Vulnerability Date : 11-Apr-93
===============================================================================

CERT-NL received information from CERT Coordination Center who has
received information concerning a vulnerability in versions of
wuarchive ftpd available before April 8, 1993. Vulnerable wuarchive
ftpd versions were available from
wuarchive.wustl.edu:/packages/ftpd.wuarchive.shar and many other
anonymous FTP sites.

We strongly recommend that any site using versions of wuarchive ftpd
dating prior to April 8, 1993, immediately take corrective action or
remove this service.

- ---------------------------------------------------------------------------

I. Description

A vulnerability exists in the access control mechanism in this
version of ftpd.


II. Impact

Anyone (remote or local) can potentially gain access to any
account including root on a host running this version of ftpd.


III. Solution

Affected sites may choose to disable anonymous FTP service until
they have corrected this problem.

Affected sites can correct this problem through one of the
following two procedures:

A. A new version of ftpd has been released that provides new features
and also fixes this security problem. Sites can obtain this new
version via anonymous FTP from wuarchive.wustl.edu (128.252.135.4).
The files are located in:

Size Checksum
/packages/wuarchive-ftpd/wu-ftpd-2.0.shar 421953 08786
/packages/wuarchive-ftpd/wu-ftpd-2.0.tar 491520 27466

B. Make modifications to your existing wuarchive ftpd sources using
the diff output provided below, recompile and install according to
the instructions provided.

*** ftpd.c.orig
- --- ftpd.c
***************
*** 413,418 ****
- --- 413,420 ----
end_login();
}

+ anonymous = 0;
+
if (!strcasecmp(name, "ftp") || !strcasecmp(name, "anonymous")) {
if (checkuser("ftp") || checkuser("anonymous")) {
reply(530, "User %s access denied.", name);

- ---------------------------------------------------------------------------

The CERT Coordination Center wishes to thank Scott Paisley, Computer Systems
Support Manager, Factory Automated Systems Division, N.I.S.T., for informing
us of this vulnerability. We would also like to thank Chris Myers, Washington
University, for his quick response to this problem.

CERT-NL wishes to thank CERT Coordination Center for bringing the
information regarding this vulnerability to our attention.

- ---------------------------------------------------------------------------

==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS
Phone: +31 302 305 305 BUSINESS HOURS ONLY
Fax: +31 302 305 329 BUSINESS HOURS ONLY
Snailmail: SURFnet bv
Attn. CERT-NL
P.O. Box 19035
NL - 3501 DA UTRECHT
The Netherlands

NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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