Lighttpd: Two Denials of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200705-07 / lighttpd
Release Date	May 07, 2007
Latest Revision	May 07, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/lighttpd	< 1.4.14	>= 1.4.14	All supported architectures

Related bugreports: #174043

Synopsis

Two vulnerabilities have been discovered in Lighttpd, each allowing for a Denial of Service.

2. Impact Information

Background

Lighttpd is a lightweight HTTP web server.

Description

Robert Jakabosky discovered an infinite loop triggered by a connection abort when Lighttpd processes carriage return and line feed sequences. Marcus Rueckert discovered a NULL pointer dereference when a server running Lighttpd tries to access a file with a mtime of 0.

Impact

A remote attacker could upload a specially crafted file to the server or send a specially crafted request and then abort the connection, possibly resulting in a crash or a Denial of Service by CPU consumption.

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-1.4.14"

4. References

Page updated May 07, 2007

Summary: This is a Gentoo Linux Security Advisory

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