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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2006.0020 -- AUSCERT ALERT
                               [UNIX/Linux]
        A race condition in sendmail may allow a remote attacker to
                           execute arbitary code
                               23 March 2006

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        AusCERT Alert Summary
        ---------------------

Product:           sendmail version 8.13.5 and prior
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact:            Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated
CVE Names:         CVE-2006-0058 

Original Bulletin: http://xforce.iss.net/xforce/alerts/id/216


OVERVIEW:

        A flaw in the handling of asynchronous signals was discovered in 
        Sendmail [1]. A remote attacker may be able to exploit a race 
        condition to execute arbitrary code as the user running sendmail 
        (typically root).


IMPACT:

        By forcing the SMTP server to have data write timeouts at the 
        correct instant the attacker may be able to execute arbitrary 
        code with the privileges of the sendmail process. 


MITIGATION:

        Sendmail has released version 8.13.6 [2] and patches for 
        versions 8.13.5 [3] and 8.12.11 [4] to correct this 
        vulnerability. Sendmail, Inc have also released updates for 
        commercial versions [5].


REFERENCES:

        [1] http://xforce.iss.net/xforce/alerts/id/216
        [2] http://www.sendmail.org/8.13.6.html
        [3] ftp://ftp.sendmail.org/pub/sendmail/8.13.5.p0
        [4] ftp://ftp.sendmail.org/pub/sendmail/8.12.11.p0
        [5] http://www.sendmail.com/company/advisory/index.shtml


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 decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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 member emergencies only.
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