lighttpd: Script source disclosure

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200502-21 / lighttpd
Release Date	February 15, 2005
Latest Revision	May 22, 2006: 02
Impact	low
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/lighttpd	< 1.3.10-r1	>= 1.3.10-r1	All supported architectures

Related bugreports: #81776

Synopsis

An attacker can trick lighttpd into revealing the source of scripts that should be executed as CGI or FastCGI applications.

2. Impact Information

Background

lighttpd is a small-footprint, fast, compliant and very flexible web-server which is optimized for high-performance environments.

Description

lighttpd uses file extensions to determine which elements are programs that should be executed and which are static pages that should be sent as-is. By appending %00 to the filename, you can evade the extension detection mechanism while still accessing the file.

Impact

A remote attacker could send specific queries and access the source of scripts that should have been executed as CGI or FastCGI applications.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All lighttpd users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/lighttpd-1.3.10-r1"

4. References

Updated February 15, 2005

Summary: This is a Gentoo Linux Security Advisory

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