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AA-2007.0077                  AUSCERT Advisory

                               [UNIX/Linux]
         Lighttpd mod_fastcgi remote buffer overflow vulnerability
                             11 September 2007
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        AusCERT Advisory Summary
        ------------------------

Product:              Lighttpd 1.4.17 and prior
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-4727
Member content until: Tuesday, October 09 2007


OVERVIEW:

	The mod_fastcgi component of Lighttpd contains a buffer overflow
	vulnerability during processing of HTTP headers. 


IMPACT:

	If the mod_fastcgi module is used, an attacker may remotely compromise 
	the server, executing arbitrary code with the privileges of the 
	lighttpd process.

	Example exploit code for this vulnerability has been widely published.


MITIGATION:

	Lighttpd 1.4.18 has been released fixing this vulnerability. [2] 
	A source code patch is also available. [3]


REFERENCES:

	[1] SecWeb advisory
	    http://secweb.se/en/advisories/lighttpd-fastcgi-remote-vulnerability/

	[2] Lighttpd 1.4.18 release announcement
	    http://www.lighttpd.net/2007/9/9/1-4-18-speeding-up-a-bit

	[3] Lighttpd SA 2007:12 patch
	    http://www.lighttpd.net/download/lighttpd-1.4.x_mod_fastcgi_overrun.patch


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

===========================================================================
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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