Lighttpd: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200708-11 / lighttpd
Release Date	August 16, 2007
Latest Revision	August 16, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/lighttpd	< 1.4.16	>= 1.4.16	All supported architectures

Related bugreports: #185442

Synopsis

Several vulnerabilities were reported in Lighttpd, most of them allowing a Denial of Service and potentially the remote execution of arbitrary code.

2. Impact Information

Background

Lighttpd is a lightweight HTTP web server.

Description

Stefan Esser discovered errors with evidence of memory corruption in the code parsing the headers. Several independent researchers also reported errors involving the handling of HTTP headers, the mod_auth and mod_scgi modules, and the limitation of active connections.

Impact

A remote attacker can trigger any of these vulnerabilities by sending malicious data to the server, which may lead to a crash or memory exhaustion, and potentially the execution of arbitrary code. Additionally, access-deny settings can be evaded by appending a final / to a URL.

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-1.4.16"

4. References

Updated August 16, 2007

Summary: This is a Gentoo Linux Security Advisory

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