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HylaFAX: hfaxd unauthorized login vulnerability


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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.


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


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


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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