monkeyd: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200504-14 / monkeyd
Release Date	April 15, 2005
Latest Revision	May 22, 2006: 02
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/monkeyd	< 0.9.1	>= 0.9.1	All supported architectures

Related bugreports: #87916

Synopsis

Format string and Denial of Service vulnerabilities have been discovered in the monkeyd HTTP server, potentially resulting in the execution of arbitrary code.

2. Impact Information

Background

monkeyd is a fast, efficient, small and easy to configure web server for Linux.

Description

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered a double expansion error in monkeyd, resulting in a format string vulnerability. Ciaran McCreesh of Gentoo Linux discovered a Denial of Service vulnerability, a syntax error caused monkeyd to zero out unallocated memory should a zero byte file be requested.

Impact

The format string vulnerability could allow an attacker to send a specially crafted request to the monkeyd server, resulting in the execution of arbitrary code with the permissions of the user running monkeyd. The DoS vulnerability could allow an attacker to disrupt the operation of the web server, should a zero byte file be accessible.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All monkeyd users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/monkeyd-0.9.1"

4. References

Updated April 15, 2005

Summary: This is a Gentoo Linux Security Advisory

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