[ GLSA 200709-16 ] Lighttpd: Buffer overflow

[GLSA]

Gentoo Linux Security Advisory

Title: Lighttpd: Buffer overflow (GLSA 200709-16)
Severity: high
Exploitable: remote
Date: September 27, 2007
Bug(s): #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: www-servers/lighttpd
Vulnerable: < 1.4.18
Unaffected: >= 1.4.18
Architectures: 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: