GLSA 200709-16: Lighttpd: Buffer overflow

http://security.gentoo.org/

Severity:	high
Title:	Lighttpd: Buffer overflow
Date:	09/27/2007
Bugs:	#191912
ID:	200709-16

Synopsis

Lighttpd is vulnerable to the remote execution of arbitrary code.

Background

Lighttpd is a lightweight HTTP web server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
www-servers/lighttpd	< 1.4.18	>= 1.4.18	All supported architectures

Description

Mattias Bengtsson and Philip Olausson have discovered a buffer overflow vulnerability in the function fcgi_env_add() in the file mod_fastcgi.c when processing overly long HTTP headers.

Impact

A remote attacker could send a specially crafted request to the vulnerable Lighttpd server, resulting in the remote execution of arbitrary code with privileges of the user running the web server. Note that mod_fastcgi is disabled in Gentoo's default configuration.

Workaround

Edit the file /etc/lighttpd/lighttpd.conf and comment the following line: "include mod_fastcgi.conf"

Resolution

All Lighttpd users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-servers/lighttpd-1.4.18"

References

CVE-2007-4727

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200709-16.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.