Date: Thu, 20 Jan 2000 18:21:23 -0600
From: "Christopher P. Lindsey" <[email protected]>
To: [email protected]Subject: AusCERT Advisory AA-2000.01 Majordomo open() call Vulnerability
With all of the talk about the majordomo exploit earlier this month...
Chris
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From: [email protected]
Organization: AUSCERT (Australian Computer Emergency Response Team)
Date: Fri, 21 Jan 2000 09:55:57 +1000
AA-2000.01 AUSCERT Advisory
Majordomo open() call Vulnerability
20 January 2000
Last Revised: --
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AusCERT has received information that a vulnerability exists in the
majordomo package versions up to and including 1.94.4.
This vulnerability may allow local users to gain the privileges of
the user the majordomo process executes as and that of the local mail
delivery agent.
Exploit information involving this vulnerability has been made publicly
available.
AusCERT recommends that sites take the steps outlined in section 3 as soon
as possible.
This advisory will be updated as more information becomes available.
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1. Description
The majordomo program is a popular application which automates the
management of Internet mailing lists. More information on majordomo
is available from:
http://www.greatcircle.com/majordomo/
A vulnerability exists in majordomo versions up to and including 1.94.4.
Exploit information involving this vulnerability has been made publicly
available.
2. Impact
This vulnerability may allow local users to gain the privileges under
which majordomo and the local mail delivery agent executes. Depending
on the local majordomo configuration this may be leveraged to gain
additional privileges.
3. Solution
The vendors of majordomo have produced a minor software release which
addresses the vulnerability in versions 1.94.4 and earlier. Sites using
affected versions should immediately upgrade to majordomo 1.94.5 which
is available from:
ftp://ftp.greatcircle.com/pub/majordomo/1.94.5/majordomo-1.94.5.tgzftp://ftp.sgi.com/other/majordomo/majordomo-1.94.5.tgz
4. Additional measures
Sites using majordomo should also take this opportunity to ensure that
their majordomo is configured correctly. While correct configuration does
not prevent the vulnerability listed in this advisory being exploited it
may help limit the privileges a local user may gain. More information
on this can be found in the INSTALL file and in the majordomo FAQ
available at:
http://www.greatcircle.com/majordomo/FAQ.html
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AusCERT thanks Chan Wilson and Brock Tellier for their assistance in
producing this advisory.
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AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The
appropriateness of this document for an organisation or individual system
should be considered before application in conjunction with local policies
and procedures. AusCERT takes no responsibility for the consequences of
applying the contents of this document.
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
AusCERT maintains an anonymous FTP service which is found on:
ftp://ftp.auscert.org.au/pub/. This archive contains past SERT and AusCERT
Advisories, and other computer security information.
AusCERT also maintains a World Wide Web service which is found on:
http://www.auscert.org.au/.
Internet Email: [email protected]
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
Postal:
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
AUSTRALIA
