HylaFAX - Format String Vulnerability Fixed Nov 11 2003 09:58PM
Lee Howard (lee howard hylafax org)
HylaFAX Security Advisory
11 November 2003

Subject: Format String Vulnerability Fixed


HylaFAX is a mature (est. 1991) enterprise-class open source software
package for sending and receiving facsimiles as well as for sending
alpha-numeric pages. It runs on a wide variety of UNIX-like platforms
including Linux, BSD (including Mac OS X), SunOS and Solaris, SCO,
IRIX, AIX, and HP-UX. See http://www.hylafax.org for more details.

Problem Description and Impact:

The SuSE Security Team recently audited the HylaFAX daemon (hfaxd) and
discovered a remotely exploitable format string vulnerability.

A vulnerable host must have set the 0x002 bit for the ServerTracing
configuration parameter. This is not the default setting for the
HylaFAX installation, but it is not an uncommon configuration when
troubleshooting HylaFAX operation.


HylaFAX development has released the 4.1.8 patch-level code release
which includes the fix for this format string vulnerability as
contributed by SuSE. All users are strongly encouraged to upgrade.


HylaFAX 4.1.8 is available by anonymous ftp at:


(Binary versions will shortly be made available)

The fix is available in patch form at:


There is no known exploitation in the wild of this vulnerability.


Many thanks go to the SuSE Security Team and Sebastian Krahmer for
their commendable handling of this vulnerability. Thanks also go to
Michael O'Connor at SGI for his advice in establishing the security


Matters pertaining to HylaFAX security should be addressed to
HylaFAX-CERT <security (at) hylafax (dot) org [email concealed]>

Lee Howard
HylaFAX Developer
lee.howard (at) hylafax (dot) org [email concealed]

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