HylaFAX: hfaxd unauthorized login vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200501-21 / HylaFAX
Release Date	January 11, 2005
Latest Revision	January 11, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/hylafax	< 4.2.0-r2	>= 4.2.0-r2	All supported architectures

Related bugreports: #75941

Synopsis

HylaFAX is subject to a vulnerability in its username matching code, potentially allowing remote users to bypass access control lists.

2. Impact Information

Background

HylaFAX is a software package for sending and receiving facsimile messages.

Description

The code used by hfaxd to match a given username and hostname with an entry in the hosts.hfaxd file is insufficiently protected against malicious entries.

Impact

If the HylaFAX installation uses a weak hosts.hfaxd file, a remote attacker could authenticate using a malicious username or hostname and bypass the intended access restrictions.

3. Resolution Information

Workaround

As a workaround, administrators may consider adding passwords to all entries in the hosts.hfaxd file.

Resolution

All HylaFAX users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/hylafax-4.2.0-r2"

Note: Due to heightened security, weak entries in the hosts.hfaxd file may no longer work. Please see the HylaFAX documentation for details of accepted syntax in the hosts.hfaxd file.

4. References

Page updated January 11, 2005

Summary: This is a Gentoo Linux Security Advisory

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